US20090283269A1 - Extended cement compositions comprising oil-swellable particles and associated methods - Google Patents
Extended cement compositions comprising oil-swellable particles and associated methods Download PDFInfo
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- US20090283269A1 US20090283269A1 US12/152,327 US15232708A US2009283269A1 US 20090283269 A1 US20090283269 A1 US 20090283269A1 US 15232708 A US15232708 A US 15232708A US 2009283269 A1 US2009283269 A1 US 2009283269A1
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- cement composition
- oil
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- rubber
- cement
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- 239000004568 cement Substances 0.000 title claims abstract description 212
- 239000000203 mixture Substances 0.000 title claims abstract description 153
- 239000002245 particle Substances 0.000 title claims abstract description 72
- 238000000034 method Methods 0.000 title claims abstract description 51
- 239000000654 additive Substances 0.000 claims abstract description 43
- 230000000996 additive effect Effects 0.000 claims abstract description 34
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 30
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 25
- 230000000979 retarding effect Effects 0.000 claims abstract description 23
- 239000012530 fluid Substances 0.000 claims abstract description 21
- 229920001971 elastomer Polymers 0.000 claims description 31
- 239000005060 rubber Substances 0.000 claims description 18
- 229920003048 styrene butadiene rubber Polymers 0.000 claims description 18
- 239000003921 oil Substances 0.000 claims description 17
- 239000000806 elastomer Substances 0.000 claims description 13
- 239000002174 Styrene-butadiene Substances 0.000 claims description 11
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims description 10
- MTAZNLWOLGHBHU-UHFFFAOYSA-N butadiene-styrene rubber Chemical compound C=CC=C.C=CC1=CC=CC=C1 MTAZNLWOLGHBHU-UHFFFAOYSA-N 0.000 claims description 10
- 239000001110 calcium chloride Substances 0.000 claims description 10
- 229910001628 calcium chloride Inorganic materials 0.000 claims description 10
- 229920001577 copolymer Polymers 0.000 claims description 10
- 239000011115 styrene butadiene Substances 0.000 claims description 10
- 229920001400 block copolymer Polymers 0.000 claims description 9
- 239000011396 hydraulic cement Substances 0.000 claims description 8
- -1 crystalline silica compound Chemical class 0.000 claims description 7
- 229920001732 Lignosulfonate Polymers 0.000 claims description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 5
- 150000003839 salts Chemical class 0.000 claims description 5
- 239000004709 Chlorinated polyethylene Substances 0.000 claims description 4
- 229920000181 Ethylene propylene rubber Polymers 0.000 claims description 4
- 239000004115 Sodium Silicate Substances 0.000 claims description 4
- 229920005557 bromobutyl Polymers 0.000 claims description 4
- 229920005549 butyl rubber Polymers 0.000 claims description 4
- 229920005556 chlorobutyl Polymers 0.000 claims description 4
- 229920005560 fluorosilicone rubber Polymers 0.000 claims description 4
- 150000007524 organic acids Chemical class 0.000 claims description 4
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 4
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 4
- 229920002943 EPDM rubber Polymers 0.000 claims description 3
- 244000043261 Hevea brasiliensis Species 0.000 claims description 3
- 239000005062 Polybutadiene Substances 0.000 claims description 3
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 claims description 3
- YFRNYWVKHCQRPE-UHFFFAOYSA-N buta-1,3-diene;prop-2-enoic acid Chemical compound C=CC=C.OC(=O)C=C YFRNYWVKHCQRPE-UHFFFAOYSA-N 0.000 claims description 3
- VSGNNIFQASZAOI-UHFFFAOYSA-L calcium acetate Chemical compound [Ca+2].CC([O-])=O.CC([O-])=O VSGNNIFQASZAOI-UHFFFAOYSA-L 0.000 claims description 3
- 239000001639 calcium acetate Substances 0.000 claims description 3
- 235000011092 calcium acetate Nutrition 0.000 claims description 3
- 229960005147 calcium acetate Drugs 0.000 claims description 3
- 239000005038 ethylene vinyl acetate Substances 0.000 claims description 3
- 239000000835 fiber Substances 0.000 claims description 3
- 229920003049 isoprene rubber Polymers 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 229920003052 natural elastomer Polymers 0.000 claims description 3
- 229920001194 natural rubber Polymers 0.000 claims description 3
- 229920001084 poly(chloroprene) Polymers 0.000 claims description 3
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 claims description 3
- 229920000058 polyacrylate Polymers 0.000 claims description 3
- 229920002857 polybutadiene Polymers 0.000 claims description 3
- 229920002379 silicone rubber Polymers 0.000 claims description 3
- 239000000375 suspending agent Substances 0.000 claims description 3
- SRWMQSFFRFWREA-UHFFFAOYSA-M zinc formate Chemical compound [Zn+2].[O-]C=O SRWMQSFFRFWREA-UHFFFAOYSA-M 0.000 claims description 3
- 239000002270 dispersing agent Substances 0.000 claims description 2
- 238000001914 filtration Methods 0.000 claims description 2
- 239000004816 latex Substances 0.000 claims description 2
- 229920000126 latex Polymers 0.000 claims description 2
- 239000004005 microsphere Substances 0.000 claims description 2
- 230000009974 thixotropic effect Effects 0.000 claims description 2
- 239000004945 silicone rubber Substances 0.000 claims 2
- 239000004927 clay Substances 0.000 claims 1
- 229910002026 crystalline silica Inorganic materials 0.000 claims 1
- 235000012239 silicon dioxide Nutrition 0.000 claims 1
- 238000005755 formation reaction Methods 0.000 description 11
- 239000002480 mineral oil Substances 0.000 description 11
- 235000010446 mineral oil Nutrition 0.000 description 11
- 230000008961 swelling Effects 0.000 description 10
- 238000007654 immersion Methods 0.000 description 9
- 230000008901 benefit Effects 0.000 description 8
- 239000008186 active pharmaceutical agent Substances 0.000 description 4
- 230000000246 remedial effect Effects 0.000 description 4
- 239000011398 Portland cement Substances 0.000 description 3
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 230000009969 flowable effect Effects 0.000 description 3
- 238000002955 isolation Methods 0.000 description 3
- 239000004033 plastic Substances 0.000 description 3
- 229920003023 plastic Polymers 0.000 description 3
- XHZPRMZZQOIPDS-UHFFFAOYSA-N 2-Methyl-2-[(1-oxo-2-propenyl)amino]-1-propanesulfonic acid Chemical compound OS(=O)(=O)CC(C)(C)NC(=O)C=C XHZPRMZZQOIPDS-UHFFFAOYSA-N 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 2
- RGHNJXZEOKUKBD-SQOUGZDYSA-N D-gluconic acid Chemical compound OC[C@@H](O)[C@@H](O)[C@H](O)[C@@H](O)C(O)=O RGHNJXZEOKUKBD-SQOUGZDYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- FEWJPZIEWOKRBE-UHFFFAOYSA-N Tartaric acid Natural products [H+].[H+].[O-]C(=O)C(O)C(O)C([O-])=O FEWJPZIEWOKRBE-UHFFFAOYSA-N 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 229910052791 calcium Inorganic materials 0.000 description 2
- 231100001261 hazardous Toxicity 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000005012 migration Effects 0.000 description 2
- 238000013508 migration Methods 0.000 description 2
- 235000005985 organic acids Nutrition 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 235000002906 tartaric acid Nutrition 0.000 description 2
- 239000011975 tartaric acid Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- KUDUQBURMYMBIJ-UHFFFAOYSA-N 2-prop-2-enoyloxyethyl prop-2-enoate Chemical compound C=CC(=O)OCCOC(=O)C=C KUDUQBURMYMBIJ-UHFFFAOYSA-N 0.000 description 1
- RGHNJXZEOKUKBD-UHFFFAOYSA-N D-gluconic acid Natural products OCC(O)C(O)C(O)C(O)C(O)=O RGHNJXZEOKUKBD-UHFFFAOYSA-N 0.000 description 1
- FEWJPZIEWOKRBE-JCYAYHJZSA-N Dextrotartaric acid Chemical compound OC(=O)[C@H](O)[C@@H](O)C(O)=O FEWJPZIEWOKRBE-JCYAYHJZSA-N 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 239000012267 brine Substances 0.000 description 1
- 229920005551 calcium lignosulfonate Polymers 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 150000001735 carboxylic acids Chemical class 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 239000013505 freshwater Substances 0.000 description 1
- 239000000174 gluconic acid Substances 0.000 description 1
- 235000012208 gluconic acid Nutrition 0.000 description 1
- 239000010440 gypsum Substances 0.000 description 1
- 229910052602 gypsum Inorganic materials 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 229920005610 lignin Polymers 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 229920005552 sodium lignosulfonate Polymers 0.000 description 1
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/42—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells
- C09K8/46—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing inorganic binders, e.g. Portland cement
- C09K8/467—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing inorganic binders, e.g. Portland cement containing additives for specific purposes
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00034—Physico-chemical characteristics of the mixtures
- C04B2111/00146—Sprayable or pumpable mixtures
Definitions
- the present invention relates to cementing operations and, more particularly, to extended cement compositions comprising cement, water, oil-swellable particles, and a set retarding additive and associated methods of use.
- Cement compositions are commonly utilized in subterranean operations, particularly subterranean well construction and remedial operations.
- a pipe string e.g., casing, liners, etc.
- the process of cementing the pipe string in place is commonly referred to as “primary cementing.”
- a cement composition may be pumped into an annulus between the walls of a well bore and the exterior surface of the pipe string disposed therein.
- the cement composition sets in the annular space, thereby forming an annular sheath of hardened, substantially impermeable cement that supports and positions the pipe string in the well bore and bonds the exterior surface of the pipe string to the walls of the well bore.
- the annular sheath of set cement surrounding the pipe string functions to prevent the migration of fluids in the annulus, as well as protecting the pipe string from corrosion.
- Cement compositions also may be used in remedial cementing operations, such as squeeze cementing and the placement of cement plugs.
- the cement sheath may be subjected to a variety of cyclic, shear, tensile, impact, flexural, and/or compressive stresses that may lead to failure of the cement sheath. Such failure may be the result of fractures, cracks, and/or debonding of the cement sheath from the pipe string and/or the formation.
- cement-sheath failure may lead to loss of zonal isolation, resulting, for example, in the undesirable migration of fluids between formation zones. This may lead to undesirable consequences such as lost production, costly remedial operations, environmental pollution, hazardous rig operations resulting from unexpected fluid flow from the formation caused by the loss of zonal isolation, and/or hazardous production operations.
- failure of the cement sheath also may be caused by forces exerted by shifts in subterranean formations surrounding the well bore, cement erosion, and repeated impacts from the drill bit and the drill pipe.
- extended cement compositions may be used.
- extended cement composition refers to a cement composition capable of remaining in a pumpable fluid state for an extended period of time (e.g., at least about 1 day).
- a fluid is considered to be in a pumpable fluid state where the fluid has a viscosity of less than 70 Bc, as measured using an FANN Atmospheric Consistometer Model 165AT (available from FANN Instrument Company, Houston, Tex.) at room temperature (for example, 78° F.).
- the extended cement compositions comprise cement, water, and a set retarder and remain in a pumpable fluid state for an extended period of time.
- the extended cement composition should be capable of being activated whereby reasonable compressive strengths are developed.
- a cement set accelerator may be added to the extended cement composition whereby the composition sets into a hardened mass.
- the extended cement compositions may be suitable for use in well bore applications, for example, where it is desired to prepare the cement composition in advance. This may allow, for example, the cement composition to be stored prior to its use. In addition, this may allow, for example, the cement composition to be prepared at a convenient location and then transported to the job site for use. Accordingly, capital expenditures associated with the cementing operations may be reduced due to a reduction in the need for on-site bulk storage and mixing equipment.
- the present invention relates to cementing operations and, more particularly, to extended cement compositions comprising cement, water, oil-swellable particles, and a set retarding additive and associated methods of use.
- One embodiment of the present invention comprises a method of cementing in a subterranean formation comprising: providing an extended cement composition comprising cement, water, an oil-swellable particle, and a set retarding additive, wherein the extended cement composition is capable of remaining in a pumpable fluid state for at least about 1 day; adding a cement set accelerator to the extended cement composition; introducing the extended cement composition into a well bore; and allowing the extended cement composition to set.
- Another embodiment of the present invention comprises a method of cementing in a subterranean formation comprising: providing an extended cement composition comprising hydraulic cement, water, an oil-swellable particle, and a set retarding additive; storing the extended cement composition; adding a cement set accelerator to the extended cement composition; introducing the extended cement composition into a well bore; and allowing the extended cement composition to set.
- Another embodiment of the present invention comprises an extended cement composition comprising: cement; water; an oil-swellable particle; and a set retarding additive, wherein the extended cement composition is capable of remaining in a pumpable fluid state for at least about 1 day.
- FIG. 1 is a photograph comparing the expansion of a cement cube comprising oil-swellable particles after 4 days immersion in an oil bath, in accordance with one embodiment of the present invention.
- FIG. 2 is a photograph illustrating the swelling of oil-swellable particles included in a cement cube after immersion of the cube in an oil bath, in accordance with one embodiment of the present invention.
- FIG. 3 is another photograph illustrating the swelling of oil-swellable particles included in a cement cube after immersion of the cube in an oil bath, in accordance with one embodiment of the present invention.
- the present invention relates to cementing operations and, more particularly, to extended cement compositions comprising cement, water, oil-swellable particles, and a set retarding additive and associated methods of use.
- the present invention provides extended cement compositions that are capable of remaining in a pumpable fluid state for an extended period of time.
- the extended cement compositions may be capable of remaining in a pumpable fluid state for at least about 1 day or longer (e.g., at least about 1 day, 2 days, 3 days, 4 days, 5 days, or the like).
- the extended cement composition may be activated (e.g., by addition of a cement set accelerator) to thereby set into a hardened mass.
- the extended cement composition after activation, may set to a compressive strength (as determined using the procedure set forth in API Specification 10) at 140° F.
- the extended cement compositions of the present invention may be suitable for use in well bore applications, for example, where it is desired to prepare the cement composition in advance.
- the extended cement compositions may facilitate preparation of the cement composition at a convenient location and then transport to the job site for use in the cementing operation.
- An example of a suitable extended cement composition of the present invention comprises cement, water, an oil-swellable particle, and a set retarding additive.
- a suspending agent may be included in the extended cement composition as desired.
- the extended cement compositions of the present invention should have a density suitable for a particular application as desired by those of ordinary skill in the art, with the benefit of this disclosure.
- the extended cement compositions of the present invention may have a density in the range of about 8 pounds per gallon (“lb/gal”) to about 16 lb/gal.
- Embodiments of the extended cement compositions of the present invention generally comprise a cement.
- the cement comprises hydraulic cement.
- a variety of hydraulic cements may be utilized in accordance with embodiments of the present invention, including, but not limited to, those comprising calcium, aluminum, silicon, oxygen, iron, and/or sulfur, which set and harden by reaction with water.
- Suitable hydraulic cements include, but are not limited to, Portland cements, pozzolana cements, gypsum cements, high alumina content cements, slag cements, silica cements, and combinations thereof.
- the hydraulic cement may comprise a Portland cement.
- the Portland cements that are suited for use in the present invention are classified as Classes A, C, H, and G cements according to American Petroleum Institute, API Specification for Materials and Testing for Well Cements, API Specification 10, Fifth Ed., Jul. 1, 1990.
- the water used in embodiments of the extended cement compositions of the present invention may include, for example, freshwater, saltwater (e.g., water containing one or more salts dissolved therein), brine (e.g., saturated saltwater produced from subterranean formations), seawater, or combinations thereof.
- the water may be from any source, provided that it does not contain an excess of compounds that may undesirably affect other components in the settable composition.
- the water may be included in an amount sufficient to form a pumpable slurry.
- the water may be included in the extended cement compositions of the present invention in an amount in the range of about 40% to about 200% by weight of the cement (“bwoc”) (e.g., about 50%, about 60%, about 70%, about 80%, about 90%, about 100%, about 110%, about 120%, about 130%, about 140%, about 150%, about 160%, about 170%, about 180%, about 190%, etc.). In some embodiments, the water may be included in an amount in the range of about 40% to about 150% bwoc.
- embodiments of the extended cement compositions may comprise an oil-swellable particle.
- a particle is characterized as oil swellable when it swells upon contact with oil.
- the oil-swellable particle may be included in the extended cement composition, for example, to counteract the formation of cracks in the cement sheath and/or micro-annulus between the cement sheath and the pipe string or the formation.
- the oil-swellable particle should be capable of swelling when contacted by oil to inhibit fluid flow through the crack and/or micro-annulus. Accordingly, the oil-swellable particle may prevent and/or reduce the loss of zonal isolation in spite of the formation of cracks and/or micro-annulus, potentially resulting in an improved annular seal for the extended cement compositions.
- An example of an oil-swellable particle that may be utilized in embodiments of the present invention comprises an oil-swellable elastomer.
- Oil-swellable elastomers suitable for use in embodiments of the present invention may generally swell by up to about 500% of their original size at the surface when contacted by oil. Under downhole conditions, this swelling may be more, or less, depending on the conditions presented. For example, the swelling may be at least 10% at downhole conditions. In some embodiments, the swelling may be up to about 200% under downhole conditions.
- the actual swelling when the swellable elastomer is included in a cement composition may depend on, for example, the concentration of the swellable elastomer included in the cement composition, downhole pressure, and downhole temperature, among other factors.
- swellable elastomers include, but are not limited to, natural rubber, acrylate butadiene rubber, polyacrylate rubber, isoprene rubber, choloroprene rubber, butyl rubber (IIR), brominated butyl rubber (BIIR), chlorinated butyl rubber (CIIR), chlorinated polyethylene (CM/CPE), neoprene rubber (CR), styrene butadiene copolymer rubber (SBR), styrene butadiene block copolymer rubber, sulphonated polyethylene (CSM), ethylene acrylate rubber (EAM/AEM), epichlorohydrin ethylene oxide copolymer (CO, ECO), ethylene-propylene rubber (EPM and EDPM), ethylene-propylene-diene terpolymer rubber (EPT), ethylene vinyl acetate copolymer, fluorosilicone rubbers (FVMQ), silicone rubbers (VMQ), poly 2,2,1-bic
- suitable oil-swellable elastomers may also be utilized.
- a suitable swellable elastomer comprises a block copolymer of a styrene butadiene rubber.
- Other swellable elastomers that behave in a similar fashion with respect to oil also may be suitable.
- Those of ordinary skill in the art, with the benefit of this disclosure, will be able to select an appropriate swellable elastomer for use in the compositions of the present invention based on a variety of factors, including the application in which the composition will be used and the desired swellable characteristics.
- the oil-swellable particle generally may be included in the cement compositions in an amount sufficient to provide the desired mechanical properties.
- the swellable particle may be present in the cement compositions in an amount up to about 27% bwoc (e.g., about 1%, about 5%, about 10%, about 15%, about 20%, about 25%, etc.), alternatively in a range of about 1% to about 25% bwoc, and alternatively in a range of about 4% to about 20% bwoc.
- the swellable particle that is utilized may have a wide variety of shapes and sizes of individual particles suitable for use in accordance with embodiments of the present invention.
- the swellable particle may have a well-defined physical shape as well as an irregular geometry, including the physical shape of platelets, shavings, fibers, flakes, ribbons, rods, strips, spheroids, beads, toroids, pellets, tablets, or any other physical shape.
- the swellable particle may have a particle size in the range of about 5 microns to about 1,500 microns.
- the swellable particle may have a particle size in the range of about 20 microns to about 500 microns.
- particle sizes outside these defined ranges also may be suitable for particular applications.
- Embodiments of the extended cement compositions of the present invention generally comprise a set retarding additive.
- suitable set retarding additives include, but are not limited to, organic acids, lignosulfonates, synthetic retarders and combinations thereof.
- organic acids that may be included in the extended cement compositions of the present invention include, but are not limited to, tartaric acid, gluconic acid, carboxylic acids (e.g., citric acid), hydroxy carboxy acids, and combinations thereof.
- One example of a suitable set retarding additive is tartaric acid, available from Halliburton Energy Services under the trade name HR®-25 cement retarder.
- lignosulfonates examples include, but are not limited to, a sulfomethylated lignin, calcium lignosulfonates, sodium lignosulfonates, and combinations thereof.
- suitable lignosulfonates include HR®-4, HR®-5, and HR®-7 cement retarders available from Halliburton Energy Services, Inc.
- Examples of synthetic retarders that may be included in the extended cement compositions of the present invention include, but are not limited to, copolymers of acrylic acid and 2-acrylamido-2-methyl-propane sulfonic acid (or salts thereof) polymer and copolymers of maleic anhydride and 2-acrylamido-2-methyl-propane sulfonic acid (or salts thereof) polymer.
- Examples of suitable synthetic retarders include SCRTM-100 and SCRTM-500 cement retarders available from Halliburton Energy Services, Inc. Examples of suitable synthetic retarders are described in U.S. Pat. Nos. 4,941,536, 5,049,288, 5,472,051, and 5,536,311, the disclosures of which are incorporated herein by reference.
- the set retarding additive should be included in the extended cement compositions of the present invention in an amount sufficient for the settable composition to remain in a pumpable fluid state for an extended period of time (e.g., at least about 1 day). In certain embodiments, the set retarding additive may be included in the extended cement composition in an amount in the range of about 0.1% to about 5% bwoc (e.g., about 0.5%, about 1%, about 2%, about 3%, about 4%, etc.). In certain embodiments, the set retarding additive may be included in the extended cement composition in an amount in the range of about 0.1% to about 1.5% bwoc. Those of ordinary skill in the art, with the benefit of this disclosure, should be able to determine an appropriate set retarding additive and amount thereof for a particular application.
- the extended cement composition may be activated, for example, by addition of a cement set accelerator.
- suitable cement set accelerators include, but are not limited to, calcium chloride, triethanolamine, sodium silicate, zinc formate, calcium acetate, and combinations thereof.
- An example of a suitable sodium silicate is ECONOLITETM additive, available from Halliburton Energy Services, Inc.
- the cement set accelerator should be added to the extended cement composition in an amount sufficient to activate the extended cement composition to set into a hardened mass.
- the cement set accelerator may be added to the extended cement composition in an amount in the range of about 0.1% to about 4% by weight (e.g., about 0.5%, about 1%, about 2%, about 3%, etc.).
- additives also may be added to the extended cement compositions of the present invention as deemed appropriate by one skilled in the art, with the benefit of this disclosure.
- additives include, but are not limited to, weight reducing additives, heavyweight additives, lost circulation materials, filtration control additives, dispersants, suspending agents, and combinations thereof.
- Suitable examples of these additives include crystalline silica compounds, amorphous silica, salts, fibers, hydratable clays, microspheres, pozzolan additives, latex cement, thixotropic additives, combinations thereof and the like.
- the extended cement compositions of the present invention may be used in a variety of subterranean applications, including, but not limited to, primary and remedial cementing.
- An example of a method of the present invention may comprise providing an extended cement composition comprising cement, water, a swellable particle, and a set retarding additive, wherein the extended cement composition is capable of remaining in a pumpable fluid state for at least about 1 day.
- the method further may comprise adding a cement accelerator to the extended cement composition.
- the method further may comprise introducing the extended cement composition into a well bore, and allowing the extended cement composition to set.
- Another example of a method of the present invention may comprise providing an extended cement composition comprising cement, water, a swellable particle, and a set retarding additive.
- the method further may comprise storing the extended cement composition.
- the method further may comprise adding a cement set accelerator to the extended cement composition.
- the method further may comprise introducing the extended cement composition into a well bore, and allowing the extended cement composition to set.
- Another example of a method of the present invention is a method of cementing a pipe string (e.g., casing, expandable casing, liners, etc.) disposed in a well bore.
- the method may comprise providing an extended cement composition comprising cement, water, a swellable particle, and a set retarding additive, wherein the extended cement composition is capable of remaining in a pumpable fluid state for at least about 1 day.
- the method further may comprise adding a cement accelerator to the extended cement composition.
- the method further may comprise introducing the extended cement composition into an annulus between the pipe string and the subterranean formation surrounding the well bore, and allowing the extended cement composition to set.
- the method further may comprise introducing the pipe string into the well bore.
- a sample extended cement composition was prepared.
- the sample composition had a density of 14 lb/gal and comprised Class H Texas Lehigh cement, water in an amount of 52.4% bwoc, block copolymer of styrene-butadiene elastomeric particles in an amount of 20% bwoc, and HR®5 cement retarder in an amount of 1% bwoc.
- the sample extended cement composition was placed in a sealed plastic container at room temperature (e.g., about 78° F.). The sample composition was observed on a daily basis for flowability over 10 days. Observing the composition for flowability involved shaking the plastic container and observing whether the composition was flowable. For purposes of this example, the composition was considered to be in a fluid state based on visual observations, wherein the fluid was flowable when the plastic container was shaken. After 10 days, the sample extended cement composition remained flowable.
- a sample extended cement composition was prepared that had a density of 14 lb/gal and comprised Class H Texas Lehigh cement, water in an amount of 52.4% bwoc, block copolymer of styrene-butadiene elastomeric particles in an amount of 20% bwoc, HR® 5 cement retarder in an amount of 1% bwoc, and calcium chloride in an amount of 4% bwoc.
- the sample extended cement composition was formed into 3 cubes and cured at 140° F. After 24 hours, the set cubes were weighed. The cubes were then immersed in a mineral oil bath at 180° F. Every 24 hours after immersion in the mineral oil bath, the set cubes were removed from the mineral oil bath, dried, and weighed. The experiment was discontinued at the end of a 4-day period. Based on the weights of the cubes, the average amount of expansion was found to be 6.13%. It is believed that increased cube weight was due to swelling of the elastomeric particles from contact with the mineral oil.
- FIG. 1 is a photograph comparing one of the cubes prior to immersion in the mineral oil bath with the cube after 4 days of immersion.
- FIG. 2 is a photograph of the three cubes after 4 days of immersion.
- the expansion data for the cubes is set forth in the table below.
- Oil Weight Weight Weight Weight (% bwoc) Bath (g) (g) (g) 14 lb/gal 20 0 days 211.28 214.76 211.86 14 lb/gal 20 1 day 218.23 219.98 218.16 14 lb/gal 20 2 days 221.93 220.45 220.25 14 lb/gal 20 3 days 226.08 222.86 223.62 14 lb/gal 20 4 days 224.78 223.90 228.24 % Expanded 6.39% 4.26% 7.73% % Average Expanded 6.13% 1
- the elastomeric particles included in the sample comprised copolymers of styrene-butadiene elastomeric particles.
- Example 2 This example was similar to Example 2 except the oil-swellable particles were included in the sample extended cement composition in an amount of 27% bwoc. Accordingly, a sample extended cement composition was prepared that had a density of 13.5 lb/gal and comprised Class H Texas Lehigh cement, water in an amount of 56.5% bwoc, block copolymer of styrene-butadiene elastomeric particles in an amount of 27% bwoc, HR® 5 cement retarder in an amount of 1% bwoc, and calcium chloride in an amount of 4% bwoc.
- This sample extended cement composition was formed into 3 cubes and cured at 140° F. After 24 hours, the set cubes were weighed. The cubes were then immersed in a mineral oil bath at 180° F. Every 24 hours after immersion in the mineral oil bath, the set cubes were removed from the mineral oil bath, dried, and weighed. The experiment was discontinued at the end of a 4-day period. Based on the weights of the cubes, the average amount of expansion was found to be 6.13%. It is believed that the increased cube weight was due to swelling of the elastomeric particles due to contact with the mineral oil.
- FIG. 3 is a picture of the cubes after 4 days of immersion. The expansion data for the cubes is set forth in the table below.
- Oil Weight Weight Weight Weight Weight (% bwoc) Bath (g) (g) (g) 13.5 lb/gal 27 0 days 209.80 208.60 209.26 13.5 lb/gal 27 1 day 229.66 235.67 234.59 13.5 lb/gal 27 2 days 232.59 234.34 240.87 13.5 lb/gal 27 3 days 232.21 234.76 239.15 13.5 lb/gal 27 4 days 233.29 233.15 240.51 % Expanded 11.19% 11.76% 14.93% % Average Expanded 12.63% 1
- the elastomeric particles included in the sample comprised copolymers of styrene-butadiene elastomeric particles.
- a sample extended cement composition was prepared that had a density of 14 lb/gal and comprised Class H Texas Lehigh cement, water in an amount of 69.95% bwoc, HR® 5 cement retarder in an amount of 1% bwoc, and calcium chloride in an amount of 4% bwoc. No oil-swellable elastomeric particles were included in this sample composition.
- This sample extended cement composition was formed into 3 cubes and cured at 140° F. After 24 hours, the set cubes were weighed. The cubes were then immersed in a mineral oil bath at 180° F. At the end of 24 hours, 48 hours, and 120 hours, the set cubes were removed from the mineral oil bath, dried, and weighed. The experiment was discontinued at the end of a 4-day period. As illustrated in the table below, the cubes absorbed an insignificant amount of oil.
- every range of values (of the form, “from about a to about b,” or, equivalently, “from approximately a to b,” or, equivalently, “from approximately a-b”) disclosed herein is to be understood as referring to the power set (the set of all subsets) of the respective range of values, and set forth every range encompassed within the broader range of values.
- the indefinite articles “a” or “an”, as used in the claims, are defined herein to mean one or more than one of the element that it introduces.
- the terms in the claims have their plain, ordinary meaning unless otherwise explicitly and clearly defined by the patentee.
Abstract
Description
- The present invention relates to cementing operations and, more particularly, to extended cement compositions comprising cement, water, oil-swellable particles, and a set retarding additive and associated methods of use.
- Cement compositions are commonly utilized in subterranean operations, particularly subterranean well construction and remedial operations. For example, in subterranean well construction, a pipe string (e.g., casing, liners, etc.) may be introduced into the well and cemented in place. The process of cementing the pipe string in place is commonly referred to as “primary cementing.” In a typical primary cementing operation, a cement composition may be pumped into an annulus between the walls of a well bore and the exterior surface of the pipe string disposed therein. The cement composition sets in the annular space, thereby forming an annular sheath of hardened, substantially impermeable cement that supports and positions the pipe string in the well bore and bonds the exterior surface of the pipe string to the walls of the well bore. Among other things, the annular sheath of set cement surrounding the pipe string functions to prevent the migration of fluids in the annulus, as well as protecting the pipe string from corrosion. Cement compositions also may be used in remedial cementing operations, such as squeeze cementing and the placement of cement plugs.
- Once set, the cement sheath may be subjected to a variety of cyclic, shear, tensile, impact, flexural, and/or compressive stresses that may lead to failure of the cement sheath. Such failure may be the result of fractures, cracks, and/or debonding of the cement sheath from the pipe string and/or the formation. Undesirably, cement-sheath failure may lead to loss of zonal isolation, resulting, for example, in the undesirable migration of fluids between formation zones. This may lead to undesirable consequences such as lost production, costly remedial operations, environmental pollution, hazardous rig operations resulting from unexpected fluid flow from the formation caused by the loss of zonal isolation, and/or hazardous production operations. Furthermore, failure of the cement sheath also may be caused by forces exerted by shifts in subterranean formations surrounding the well bore, cement erosion, and repeated impacts from the drill bit and the drill pipe.
- In certain applications, extended cement compositions may be used. As used herein, the term “extended cement composition” refers to a cement composition capable of remaining in a pumpable fluid state for an extended period of time (e.g., at least about 1 day). A fluid is considered to be in a pumpable fluid state where the fluid has a viscosity of less than 70 Bc, as measured using an FANN Atmospheric Consistometer Model 165AT (available from FANN Instrument Company, Houston, Tex.) at room temperature (for example, 78° F.). In general, the extended cement compositions comprise cement, water, and a set retarder and remain in a pumpable fluid state for an extended period of time. When desired for use, the extended cement composition should be capable of being activated whereby reasonable compressive strengths are developed. For example, a cement set accelerator may be added to the extended cement composition whereby the composition sets into a hardened mass. Among other things, the extended cement compositions may be suitable for use in well bore applications, for example, where it is desired to prepare the cement composition in advance. This may allow, for example, the cement composition to be stored prior to its use. In addition, this may allow, for example, the cement composition to be prepared at a convenient location and then transported to the job site for use. Accordingly, capital expenditures associated with the cementing operations may be reduced due to a reduction in the need for on-site bulk storage and mixing equipment.
- The present invention relates to cementing operations and, more particularly, to extended cement compositions comprising cement, water, oil-swellable particles, and a set retarding additive and associated methods of use.
- One embodiment of the present invention comprises a method of cementing in a subterranean formation comprising: providing an extended cement composition comprising cement, water, an oil-swellable particle, and a set retarding additive, wherein the extended cement composition is capable of remaining in a pumpable fluid state for at least about 1 day; adding a cement set accelerator to the extended cement composition; introducing the extended cement composition into a well bore; and allowing the extended cement composition to set.
- Another embodiment of the present invention comprises a method of cementing in a subterranean formation comprising: providing an extended cement composition comprising hydraulic cement, water, an oil-swellable particle, and a set retarding additive; storing the extended cement composition; adding a cement set accelerator to the extended cement composition; introducing the extended cement composition into a well bore; and allowing the extended cement composition to set.
- Another embodiment of the present invention comprises an extended cement composition comprising: cement; water; an oil-swellable particle; and a set retarding additive, wherein the extended cement composition is capable of remaining in a pumpable fluid state for at least about 1 day.
- The features and advantages of the present invention will be apparent to those skilled in the art. While numerous changes may be made by those skilled in the art, such changes are within the spirit of the invention.
- These drawings illustrate certain aspects of some of the embodiments of the present invention, and should not be used to limit or define the invention.
-
FIG. 1 is a photograph comparing the expansion of a cement cube comprising oil-swellable particles after 4 days immersion in an oil bath, in accordance with one embodiment of the present invention. -
FIG. 2 is a photograph illustrating the swelling of oil-swellable particles included in a cement cube after immersion of the cube in an oil bath, in accordance with one embodiment of the present invention. -
FIG. 3 is another photograph illustrating the swelling of oil-swellable particles included in a cement cube after immersion of the cube in an oil bath, in accordance with one embodiment of the present invention. - The present invention relates to cementing operations and, more particularly, to extended cement compositions comprising cement, water, oil-swellable particles, and a set retarding additive and associated methods of use.
- In certain embodiments, the present invention provides extended cement compositions that are capable of remaining in a pumpable fluid state for an extended period of time. For example, the extended cement compositions may be capable of remaining in a pumpable fluid state for at least about 1 day or longer (e.g., at least about 1 day, 2 days, 3 days, 4 days, 5 days, or the like). When desired for use, the extended cement composition may be activated (e.g., by addition of a cement set accelerator) to thereby set into a hardened mass. By way of example, the extended cement composition, after activation, may set to a compressive strength (as determined using the procedure set forth in API Specification 10) at 140° F. of at least about 100 psi in 72 hours, alternatively at least about 500 psi. Among other things, the extended cement compositions of the present invention may be suitable for use in well bore applications, for example, where it is desired to prepare the cement composition in advance. By way of example, the extended cement compositions may facilitate preparation of the cement composition at a convenient location and then transport to the job site for use in the cementing operation.
- An example of a suitable extended cement composition of the present invention comprises cement, water, an oil-swellable particle, and a set retarding additive. Optionally, a suspending agent may be included in the extended cement composition as desired. The extended cement compositions of the present invention should have a density suitable for a particular application as desired by those of ordinary skill in the art, with the benefit of this disclosure. In some embodiments, the extended cement compositions of the present invention may have a density in the range of about 8 pounds per gallon (“lb/gal”) to about 16 lb/gal.
- Embodiments of the extended cement compositions of the present invention generally comprise a cement. In certain embodiments, the cement comprises hydraulic cement. A variety of hydraulic cements may be utilized in accordance with embodiments of the present invention, including, but not limited to, those comprising calcium, aluminum, silicon, oxygen, iron, and/or sulfur, which set and harden by reaction with water. Suitable hydraulic cements include, but are not limited to, Portland cements, pozzolana cements, gypsum cements, high alumina content cements, slag cements, silica cements, and combinations thereof. In certain embodiments, the hydraulic cement may comprise a Portland cement. In some embodiments, the Portland cements that are suited for use in the present invention are classified as Classes A, C, H, and G cements according to American Petroleum Institute, API Specification for Materials and Testing for Well Cements, API Specification 10, Fifth Ed., Jul. 1, 1990.
- The water used in embodiments of the extended cement compositions of the present invention may include, for example, freshwater, saltwater (e.g., water containing one or more salts dissolved therein), brine (e.g., saturated saltwater produced from subterranean formations), seawater, or combinations thereof. Generally, the water may be from any source, provided that it does not contain an excess of compounds that may undesirably affect other components in the settable composition. In some embodiments, the water may be included in an amount sufficient to form a pumpable slurry. In some embodiments, the water may be included in the extended cement compositions of the present invention in an amount in the range of about 40% to about 200% by weight of the cement (“bwoc”) (e.g., about 50%, about 60%, about 70%, about 80%, about 90%, about 100%, about 110%, about 120%, about 130%, about 140%, about 150%, about 160%, about 170%, about 180%, about 190%, etc.). In some embodiments, the water may be included in an amount in the range of about 40% to about 150% bwoc.
- As set forth above, embodiments of the extended cement compositions may comprise an oil-swellable particle. As used herein, a particle is characterized as oil swellable when it swells upon contact with oil. In accordance with embodiments of the present invention, the oil-swellable particle may be included in the extended cement composition, for example, to counteract the formation of cracks in the cement sheath and/or micro-annulus between the cement sheath and the pipe string or the formation. In general, the oil-swellable particle should be capable of swelling when contacted by oil to inhibit fluid flow through the crack and/or micro-annulus. Accordingly, the oil-swellable particle may prevent and/or reduce the loss of zonal isolation in spite of the formation of cracks and/or micro-annulus, potentially resulting in an improved annular seal for the extended cement compositions.
- An example of an oil-swellable particle that may be utilized in embodiments of the present invention comprises an oil-swellable elastomer. Oil-swellable elastomers suitable for use in embodiments of the present invention may generally swell by up to about 500% of their original size at the surface when contacted by oil. Under downhole conditions, this swelling may be more, or less, depending on the conditions presented. For example, the swelling may be at least 10% at downhole conditions. In some embodiments, the swelling may be up to about 200% under downhole conditions. However, as those of ordinary skill in the art, with the benefit of this disclosure, will appreciate, the actual swelling when the swellable elastomer is included in a cement composition may depend on, for example, the concentration of the swellable elastomer included in the cement composition, downhole pressure, and downhole temperature, among other factors. Some specific examples of suitable swellable elastomers include, but are not limited to, natural rubber, acrylate butadiene rubber, polyacrylate rubber, isoprene rubber, choloroprene rubber, butyl rubber (IIR), brominated butyl rubber (BIIR), chlorinated butyl rubber (CIIR), chlorinated polyethylene (CM/CPE), neoprene rubber (CR), styrene butadiene copolymer rubber (SBR), styrene butadiene block copolymer rubber, sulphonated polyethylene (CSM), ethylene acrylate rubber (EAM/AEM), epichlorohydrin ethylene oxide copolymer (CO, ECO), ethylene-propylene rubber (EPM and EDPM), ethylene-propylene-diene terpolymer rubber (EPT), ethylene vinyl acetate copolymer, fluorosilicone rubbers (FVMQ), silicone rubbers (VMQ), poly 2,2,1-bicyclo heptene (polynorborneane), alkylstyrene, and crosslinked substituted vinyl acrylate copolymers. Combinations of suitable oil-swellable elastomers may also be utilized. One example of a suitable swellable elastomer comprises a block copolymer of a styrene butadiene rubber. Other swellable elastomers that behave in a similar fashion with respect to oil also may be suitable. Those of ordinary skill in the art, with the benefit of this disclosure, will be able to select an appropriate swellable elastomer for use in the compositions of the present invention based on a variety of factors, including the application in which the composition will be used and the desired swellable characteristics.
- Where used, the oil-swellable particle generally may be included in the cement compositions in an amount sufficient to provide the desired mechanical properties. In some embodiments, the swellable particle may be present in the cement compositions in an amount up to about 27% bwoc (e.g., about 1%, about 5%, about 10%, about 15%, about 20%, about 25%, etc.), alternatively in a range of about 1% to about 25% bwoc, and alternatively in a range of about 4% to about 20% bwoc.
- In addition, the swellable particle that is utilized may have a wide variety of shapes and sizes of individual particles suitable for use in accordance with embodiments of the present invention. By way of example, the swellable particle may have a well-defined physical shape as well as an irregular geometry, including the physical shape of platelets, shavings, fibers, flakes, ribbons, rods, strips, spheroids, beads, toroids, pellets, tablets, or any other physical shape. In some embodiments, the swellable particle may have a particle size in the range of about 5 microns to about 1,500 microns. In some embodiments, the swellable particle may have a particle size in the range of about 20 microns to about 500 microns. However, particle sizes outside these defined ranges also may be suitable for particular applications.
- Embodiments of the extended cement compositions of the present invention generally comprise a set retarding additive. Examples of suitable set retarding additives include, but are not limited to, organic acids, lignosulfonates, synthetic retarders and combinations thereof. Examples of organic acids that may be included in the extended cement compositions of the present invention include, but are not limited to, tartaric acid, gluconic acid, carboxylic acids (e.g., citric acid), hydroxy carboxy acids, and combinations thereof. One example of a suitable set retarding additive is tartaric acid, available from Halliburton Energy Services under the trade name HR®-25 cement retarder. Examples of lignosulfonates that may be included in the extended cement compositions of the present invention include, but are not limited to, a sulfomethylated lignin, calcium lignosulfonates, sodium lignosulfonates, and combinations thereof. Examples of suitable lignosulfonates include HR®-4, HR®-5, and HR®-7 cement retarders available from Halliburton Energy Services, Inc. Examples of synthetic retarders that may be included in the extended cement compositions of the present invention include, but are not limited to, copolymers of acrylic acid and 2-acrylamido-2-methyl-propane sulfonic acid (or salts thereof) polymer and copolymers of maleic anhydride and 2-acrylamido-2-methyl-propane sulfonic acid (or salts thereof) polymer. Examples of suitable synthetic retarders include SCR™-100 and SCR™-500 cement retarders available from Halliburton Energy Services, Inc. Examples of suitable synthetic retarders are described in U.S. Pat. Nos. 4,941,536, 5,049,288, 5,472,051, and 5,536,311, the disclosures of which are incorporated herein by reference.
- The set retarding additive should be included in the extended cement compositions of the present invention in an amount sufficient for the settable composition to remain in a pumpable fluid state for an extended period of time (e.g., at least about 1 day). In certain embodiments, the set retarding additive may be included in the extended cement composition in an amount in the range of about 0.1% to about 5% bwoc (e.g., about 0.5%, about 1%, about 2%, about 3%, about 4%, etc.). In certain embodiments, the set retarding additive may be included in the extended cement composition in an amount in the range of about 0.1% to about 1.5% bwoc. Those of ordinary skill in the art, with the benefit of this disclosure, should be able to determine an appropriate set retarding additive and amount thereof for a particular application.
- As previously mentioned, at a desired time for use, the extended cement composition may be activated, for example, by addition of a cement set accelerator. Examples of suitable cement set accelerators include, but are not limited to, calcium chloride, triethanolamine, sodium silicate, zinc formate, calcium acetate, and combinations thereof. An example of a suitable sodium silicate is ECONOLITE™ additive, available from Halliburton Energy Services, Inc. The cement set accelerator should be added to the extended cement composition in an amount sufficient to activate the extended cement composition to set into a hardened mass. In certain embodiments, the cement set accelerator may be added to the extended cement composition in an amount in the range of about 0.1% to about 4% by weight (e.g., about 0.5%, about 1%, about 2%, about 3%, etc.).
- Other additional additives also may be added to the extended cement compositions of the present invention as deemed appropriate by one skilled in the art, with the benefit of this disclosure. Examples of such additives include, but are not limited to, weight reducing additives, heavyweight additives, lost circulation materials, filtration control additives, dispersants, suspending agents, and combinations thereof. Suitable examples of these additives include crystalline silica compounds, amorphous silica, salts, fibers, hydratable clays, microspheres, pozzolan additives, latex cement, thixotropic additives, combinations thereof and the like.
- The extended cement compositions of the present invention may be used in a variety of subterranean applications, including, but not limited to, primary and remedial cementing. An example of a method of the present invention may comprise providing an extended cement composition comprising cement, water, a swellable particle, and a set retarding additive, wherein the extended cement composition is capable of remaining in a pumpable fluid state for at least about 1 day. The method further may comprise adding a cement accelerator to the extended cement composition. And the method further may comprise introducing the extended cement composition into a well bore, and allowing the extended cement composition to set.
- Another example of a method of the present invention may comprise providing an extended cement composition comprising cement, water, a swellable particle, and a set retarding additive. The method further may comprise storing the extended cement composition. The method further may comprise adding a cement set accelerator to the extended cement composition. And the method further may comprise introducing the extended cement composition into a well bore, and allowing the extended cement composition to set.
- Another example of a method of the present invention is a method of cementing a pipe string (e.g., casing, expandable casing, liners, etc.) disposed in a well bore. The method may comprise providing an extended cement composition comprising cement, water, a swellable particle, and a set retarding additive, wherein the extended cement composition is capable of remaining in a pumpable fluid state for at least about 1 day. The method further may comprise adding a cement accelerator to the extended cement composition. And the method further may comprise introducing the extended cement composition into an annulus between the pipe string and the subterranean formation surrounding the well bore, and allowing the extended cement composition to set. In certain embodiments, the method further may comprise introducing the pipe string into the well bore.
- To facilitate a better understanding of the present invention, the following examples of certain aspects of some embodiments are given. In no way should the following examples be read to limit, or define, the scope of the invention.
- To test the capability of a cement composition comprising oil-swellable particles to remain in a pumpable liquid state for an extended period of time, a sample extended cement composition was prepared. The sample composition had a density of 14 lb/gal and comprised Class H Texas Lehigh cement, water in an amount of 52.4% bwoc, block copolymer of styrene-butadiene elastomeric particles in an amount of 20% bwoc, and HR®5 cement retarder in an amount of 1% bwoc.
- After preparation, the sample extended cement composition was placed in a sealed plastic container at room temperature (e.g., about 78° F.). The sample composition was observed on a daily basis for flowability over 10 days. Observing the composition for flowability involved shaking the plastic container and observing whether the composition was flowable. For purposes of this example, the composition was considered to be in a fluid state based on visual observations, wherein the fluid was flowable when the plastic container was shaken. After 10 days, the sample extended cement composition remained flowable.
- To determine the capability of this sample extended cement composition to thereafter set into a hardened mass, calcium chloride in an amount of 4% bwoc was added to the sample extended cement composition. The thickening time of the sample composition was then determined, in accordance with the above-referenced API Specification 10. After addition of the calcium slurry, the sample composition reached 70 Bc after 6 hours.
- This example was performed to determine the capability of the swellable particles in the sample extended cement composition of Example 1 to swell when contacted by oil. Accordingly, a sample extended cement composition was prepared that had a density of 14 lb/gal and comprised Class H Texas Lehigh cement, water in an amount of 52.4% bwoc, block copolymer of styrene-butadiene elastomeric particles in an amount of 20% bwoc, HR® 5 cement retarder in an amount of 1% bwoc, and calcium chloride in an amount of 4% bwoc.
- The sample extended cement composition was formed into 3 cubes and cured at 140° F. After 24 hours, the set cubes were weighed. The cubes were then immersed in a mineral oil bath at 180° F. Every 24 hours after immersion in the mineral oil bath, the set cubes were removed from the mineral oil bath, dried, and weighed. The experiment was discontinued at the end of a 4-day period. Based on the weights of the cubes, the average amount of expansion was found to be 6.13%. It is believed that increased cube weight was due to swelling of the elastomeric particles from contact with the mineral oil.
FIG. 1 is a photograph comparing one of the cubes prior to immersion in the mineral oil bath with the cube after 4 days of immersion.FIG. 2 is a photograph of the three cubes after 4 days of immersion. The expansion data for the cubes is set forth in the table below. -
TABLE 1 Class H Texas Lehigh, 1% HR ® 5 Cement Retarder, 4% CaCl2, 52.4% Water, and 20% Elastomeric Particles Elastomeric Time in Cube 1 Cube 2 Cube 3 Sample Particles1 180° F. Oil Weight Weight Weight Weight (% bwoc) Bath (g) (g) (g) 14 lb/gal 20 0 days 211.28 214.76 211.86 14 lb/gal 20 1 day 218.23 219.98 218.16 14 lb/gal 20 2 days 221.93 220.45 220.25 14 lb/gal 20 3 days 226.08 222.86 223.62 14 lb/gal 20 4 days 224.78 223.90 228.24 % Expanded 6.39% 4.26% 7.73% % Average Expanded 6.13% 1The elastomeric particles included in the sample comprised copolymers of styrene-butadiene elastomeric particles. - This example was similar to Example 2 except the oil-swellable particles were included in the sample extended cement composition in an amount of 27% bwoc. Accordingly, a sample extended cement composition was prepared that had a density of 13.5 lb/gal and comprised Class H Texas Lehigh cement, water in an amount of 56.5% bwoc, block copolymer of styrene-butadiene elastomeric particles in an amount of 27% bwoc, HR® 5 cement retarder in an amount of 1% bwoc, and calcium chloride in an amount of 4% bwoc.
- This sample extended cement composition was formed into 3 cubes and cured at 140° F. After 24 hours, the set cubes were weighed. The cubes were then immersed in a mineral oil bath at 180° F. Every 24 hours after immersion in the mineral oil bath, the set cubes were removed from the mineral oil bath, dried, and weighed. The experiment was discontinued at the end of a 4-day period. Based on the weights of the cubes, the average amount of expansion was found to be 6.13%. It is believed that the increased cube weight was due to swelling of the elastomeric particles due to contact with the mineral oil.
FIG. 3 is a picture of the cubes after 4 days of immersion. The expansion data for the cubes is set forth in the table below. -
TABLE 2 Class H Texas Lehigh, 1% HR ® 5 Cement Retarder, 4% CaCl2, 56.5% Water, and 27% Elastomeric Particles Elastomeric Time in Cube 1 Cube 2 Cube 3 Sample Particles1 180° F. Oil Weight Weight Weight Weight (% bwoc) Bath (g) (g) (g) 13.5 lb/gal 27 0 days 209.80 208.60 209.26 13.5 lb/gal 27 1 day 229.66 235.67 234.59 13.5 lb/gal 27 2 days 232.59 234.34 240.87 13.5 lb/gal 27 3 days 232.21 234.76 239.15 13.5 lb/gal 27 4 days 233.29 233.15 240.51 % Expanded 11.19% 11.76% 14.93% % Average Expanded 12.63% 1The elastomeric particles included in the sample comprised copolymers of styrene-butadiene elastomeric particles. - This example was performed to determine whether the expansion of the cubes observed in Examples 2 and 3 was due to swelling of the elastomeric particles or absorption of the oil by the cubes. Accordingly, a sample extended cement composition was prepared that had a density of 14 lb/gal and comprised Class H Texas Lehigh cement, water in an amount of 69.95% bwoc, HR® 5 cement retarder in an amount of 1% bwoc, and calcium chloride in an amount of 4% bwoc. No oil-swellable elastomeric particles were included in this sample composition.
- This sample extended cement composition was formed into 3 cubes and cured at 140° F. After 24 hours, the set cubes were weighed. The cubes were then immersed in a mineral oil bath at 180° F. At the end of 24 hours, 48 hours, and 120 hours, the set cubes were removed from the mineral oil bath, dried, and weighed. The experiment was discontinued at the end of a 4-day period. As illustrated in the table below, the cubes absorbed an insignificant amount of oil.
-
TABLE 3 Class H Texas Lehigh, 1% HR ® 5 Cement Retarder, 4% CaCl2, and 69.95% Water Elastomeric Time in Cube 1 Cube 2 Sample Particles 180° F. Oil Weight Weight Weight (% bwoc) Bath (g) (g) 14 lb/gal None 0 day 217.83 232.04 14 lb/gal None 1 days 217.25 231.43 14 lb/gal None 4 days 217.24 231.21 % Expanded −0.27% −0.35% % Average Expanded −0.31% - Therefore, the present invention is well adapted to attain the ends and advantages mentioned as well as those that are inherent therein. The particular embodiments disclosed above are illustrative only, as the present invention may be modified and practiced in different but equivalent manners apparent to those skilled in the art having the benefit of the teachings herein. Furthermore, no limitations are intended to the details of construction or design herein shown, other than as described in the claims below. It is therefore evident that the particular illustrative embodiments disclosed above may be altered or modified and all such variations are considered within the scope and spirit of the present invention. In particular, every range of values (of the form, “from about a to about b,” or, equivalently, “from approximately a to b,” or, equivalently, “from approximately a-b”) disclosed herein is to be understood as referring to the power set (the set of all subsets) of the respective range of values, and set forth every range encompassed within the broader range of values. Moreover, the indefinite articles “a” or “an”, as used in the claims, are defined herein to mean one or more than one of the element that it introduces. Also, the terms in the claims have their plain, ordinary meaning unless otherwise explicitly and clearly defined by the patentee.
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US12/263,800 US7607484B2 (en) | 2005-09-09 | 2008-11-03 | Foamed cement compositions comprising oil-swellable particles and methods of use |
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US12/544,915 US8030253B2 (en) | 2005-09-09 | 2009-08-20 | Foamed cement compositions comprising oil-swellable particles |
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US12/263,800 Continuation-In-Part US7607484B2 (en) | 2005-09-09 | 2008-11-03 | Foamed cement compositions comprising oil-swellable particles and methods of use |
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