CN102587858A - Method for blocking water for fracture and hole type reservoir - Google Patents
Method for blocking water for fracture and hole type reservoir Download PDFInfo
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- CN102587858A CN102587858A CN2012100618429A CN201210061842A CN102587858A CN 102587858 A CN102587858 A CN 102587858A CN 2012100618429 A CN2012100618429 A CN 2012100618429A CN 201210061842 A CN201210061842 A CN 201210061842A CN 102587858 A CN102587858 A CN 102587858A
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Abstract
The invention provides a method for blocking water for a fracture and hole type reservoir, which is particularly applicable to high-mineralization fracture and hole type reservoirs. The method includes that blocking agent with following ingredients is selected, the ingredients of the blocking agent include, by mass percent, from 5.24 to 9.36% of cement, from 3.03 to 5.35% of microsilica, from 4.01 to 5.43% of sodium bentonite, from 0.52 to 0.55% of polymeric dispersant, from 0.17 to 0.40% of retarder, from 0.0008 to 0.0011% of sodium carbonate aqueous solution by sodium carbonate and the balance water, and water cement ratio of the blocking agent ranges from 4.07 to 6.28; the blocking agent is injected into an oil well according to output volume of 300-800L/min, and after soaking for 72 hours, the well is opened and begins production; and the use level of the blocking agent is equal to 1/2 to 2/3 of the use level of fracturing liquid during acid-fracturing of an analog crack or communication of reservoir bodies, and is calculated by 5-20m3/m of a blocking well section for a well without being in acid-fracturing. The density of the blocking agent ranges from 1.09g/cm3 to 1.14g/cm3 and is not changed before and after solidification, solidification strength ranges from 0.22 MPa to 0.43MPa, leakage of the blocking agent due to the density reason cannot be caused in a water blocking process of the fracture and hole type reservoir, and the blocking agent can effectively stay on an oil-water boundary, and selectively blocks a water outlet channel.
Description
Technical field
The present invention relates to oil reservoir chemical water shutoff field, particularly a kind ofly be applicable to the stifled agent of seam hole type oil reservoir and use this stifled agent to carry out the method for oil reservoir water blockoff, can realize effective improvement of high-water-cut oil-producing well.
Background technology
Carbonate Reservoir petroleum-in-place and output account for the 50%-60% of world oil oil in place and output, occupy an important position in the oil-gas field development at home and abroad always.The Carbonate Reservoir type is various, mainly contains large-scale protuberance, organic reef, buried hill oil pool etc., and its main reservoir space type comprises primary pore, secondary pore, dissolution porosity and crack, and large-scale corrosion seam, hole system are grown in part oil-gas reservoir.
Carbonate Reservoir reservoir bodies form has determined this type of oil reservoir to have and has built product soon that end water electrode is prone to the characteristics that awl advances, and particularly outstanding in the type oil reservoir of seam hole.Along the pit shaft output, suppress top reservoir produce oil behind the oil well bottom water coning, cause oil well high too early moisture, influence effect of reservoir development.Water blockoff is effectively to administer bottom water coning, discharges the top potentiality, recovers one of main means of oil well productivity.
Water blockoff controls water-oil factor exactly or water is produced in control, its essence is to change the flow behavior of water in the stratum, promptly changes the infiltration rule of water in the stratum.Water-blocking operation is divided into two types of oil well (producing well) water blockoff and well (injection well) profile controls according to the difference of construction object.Its objective is the cementing technology situation of remedying oil well and the permeability (adjustment flow profile) that reduces Water Flooding Layer, improve the recovery ratio of oil reservoir.
Stifled agent generally is meant the inorganic agent that is used for the producing well water blockoff.The shutoff method that adopts in the oil field is divided into two types of water pack off and chemical water shutoffs, and the chemical method water blockoff is that the chemical action of chemical plugging agent results in blockage to water-yielding stratum, the Mechanical Method water blockoff be with separator with water exit at pit shaft Nei Kakai, flow in the well to stop water.Just application and development are seen at present, mainly are the applied chemistry water blockoffs.According to the ponding of stifled agent to oil reservoir and water layer, chemical water shutoff can be divided into non-selective water blockoff and selective water plugging; Also have permanent stifled stifled with temporarily according to construction requirement.Non-selective water blockoff is meant stifled agent chemical agent of reservoir plugging and water layer simultaneously in oil reservoir; Selective water plugging is meant that stifled agent only works with water, and does not work with oil, so only result in blockage and influence very little to oil reservoir at water layer.According to the difference of decentralized medium, the selective blocking agent has water base stifled agent, the stifled agent of oil base and the stifled agent of alcohol radical, the stifled agent of polymer gel etc.; Non-selective stifled agent has cement, solid particle, thermosetting resin, inorganic salts deposition etc.
Mainly adopt stifled agent such as cement, milk of lime, resin, gel, frozen glue to seam hole type carbonate rock oilwell water shutoff early stage, but water blockoff is efficient and oil increasing effect all is not very desirable.With Ordovician of Tahe oil seam hole type Carbonate Reservoir is example; Carried out since the water blockoff test from calendar year 2001 in this oil field, and total water blockoff is efficient less than 60%, and efficient low main cause comprises two aspects: the one; Stifled agent density is big; In the plug water construction process, very easily miss, stifled agent is difficult to effectively resident, causes water blockoff invalid; The 2nd,, the stifled agent selectivity that intensity is high is not strong, and the stifled agent insufficient strength that selectivity is strong causes the invalid or period of validity weak point of water blockoff.Therefore, need to explore a kind of stifled agent and water blockoff that is fit to this type of oil well, to improve water plugging effect.
Summary of the invention
Technical problem to be solved by this invention be overcome existing seam hole type oil reservoir with stifled agent density greatly, there are defectives such as contradiction in intensity and selectivity; The method of carrying out water blockoff of a kind of opposite joint hole type oil reservoir is provided; In the type oil reservoir water blockoff process of seam hole; Can be because of the density reason cause stifled agent leakage, and stifled agent can effective resident shutoff exhalant canal; Oil in the water blockoff, water selectivity and stifled agent intensity are high, have realized high strength selective water plugging.
Big to seam hole type oil reservoir reservoir space; Fluid is easy to the advantage through density phase double replacement, and the present invention uses density between crude oil, formation water, and the profit stifled agent system of not disperseing; Utilize the gravity between formation water, stifled agent, the crude oil three; Make stifled agent selectivity resident and sprawl automatically on oil-water interfaces, and it solidifies the back and on oil-water interfaces, form dividing plate, stop end water to be invaded on too fast.The present invention is applicable to that formation water density is at 1.09g/cm
3Above high salt carbonate rock seam hole type oil reservoir selective water plugging.
In order to solve the problems of the technologies described above; First technical scheme provided by the invention is; Opposite joint hole type oil reservoir carries out the method for water blockoff; This method comprises: select the stifled agent of following composition for use, by percentage to the quality, this stifled agent comprises: cement 5.24-9.36%, little silicon 3.03-5.35%, sodium bentonite 4.01-5.43%, polymeric dispersant 0.52-0.55%, retarding agent 0.17-0.40%, account for aqueous sodium carbonate and the water surplus of 0.0008-0.0011% in sodium carbonate; Wherein, the water/binder ratio of this stifled agent is 4.07-6.28; Oil well is injected in said stifled agent, and vexed well is after at least 72 hours, opening well and making production.
Water/binder ratio according to the invention is meant the value of quality/solid constituent quality in the stifled agent.
Aforesaid opposite joint hole type oil reservoir carries out the method for water blockoff, and said plug agent amount is designed to: plug agent amount is the 1/2-2/3 of fracturing fluid consumption when acid fracturing simulation fracture volume or communication reservoir bodies; During without the acid fracturing well with plugged well section 5-20m
3/ m, preferred 6.182-8.547m
3/ m.
The present invention does not have specific (special) requirements to fracturing fluid, and conventional commercially available fracturing fluid all can be applicable to the present invention.Preferred its main component of fracturing fluid is: HPG melon glue, cleanup additive, demulsifier, bactericide, PH conditioning agent, friction reducer, organic borate cross-linker, temperature stability agent, clay stabilizer etc.Need to prove; Every this area those reagent as pH value conditioning agent, demulsifier, bactericide, cleanup additive, temperature stability agent, clay stabilizer, crosslinking agent commonly used all can be used among the application; For example; Cleanup additive can be APES; Demulsifier can be SYNPERONIC PE/F68, and friction reducer can be polyacrylamide and derivative thereof, and bactericide can be dodecyl benzyl dimethyl ammonium chloride or OIT; Temperature stability agent can be monoethanolamine, triethanolamine or ethylenediamine, and clay stabilizer can be trimethyl tertiary amine and hydrochloric acid and the synthetic trimethyl hydroxypropyl quaternary ammonium salt that generates of epichlorohydrin reaction.
Aforesaid opposite joint hole type oil reservoir carries out the method for water blockoff, according to the 300-800L/min discharge capacity, oil well is injected in said stifled agent.
Aforesaid opposite joint hole type oil reservoir carries out the method for water blockoff; By percentage to the quality; Said stifled agent comprises: cement 5.74-8.25%, little silicon 3.28-4.72%, sodium bentonite 4.72-5.43%, polymeric dispersant 0.53-0.54%, retarding agent 0.19-0.33%, account for aqueous sodium carbonate and the water surplus of 0.0009-0.0011% in sodium carbonate; Wherein, the water/binder ratio of this stifled agent is 4.37-5.72.
In above-mentioned stifled agent, the effect of said cement provides the intensity after the material cured.The preferred superfine cement of said cement reaches secondary nanophase, its median particle diameter D
50Smaller or equal to 1 μ m, preferred 0.8-1 μ m; Maximum particle diameter D
MaxBe no more than 18 μ m, 80% above particle size is below 5 μ m.
In above-mentioned stifled agent; Said little silicon (silicon ash) is when smelting ferrosilicon or industrial silicon; Behind the silicon steam oxidation of discharging through flue, collecting what obtain through dust-precipitator is the product of main component with the amorphous silica, and its effect is the intensity that improves after stifled agent is solidified; Adopt little silicon (WG) of nano-scale more to help gaining in strength its median particle diameter D
50Between 20-60nm.
In above-mentioned stifled agent, said sodium bentonite, its effect is swelling property, caking property, adsorptivity, catalytic, thixotropy, the suspension that increases stifled agent.The used sodium bentonite of the present invention select conventional drilling level swell soil all can, the sodium bentonite that promptly meets GB GB/T 5005-2010 drilling fluid materials standard promptly can be used for the present invention.
In above-mentioned stifled agent, the effect of said retarding agent is the hardening time that delays stifled agent, keeps its plasticity.The used retarding agent of the present invention selects general cement all can with retarding agent; For example lignosulfonates and derivative thereof, low molecular weight cellulose and derivative thereof, hydroxycarboxylic acid, organic phospho acid, boric acid or its salt or compound; Preferably have machine phosphonic acid, for example ethylene diamine tetra methylene phosphonic acid calcium (ethylenediamine tetramethylene phosphonic acid calcium), ethylene diamine tetra methylene phosphonic acid sodium (sodium ethylenediamine tetramethylenephosphonate), ethylenediamine five methylenephosphonic acids (ethylenediamine pentamethylene phosphonic acids).
In above-mentioned stifled agent, the effect of said polymeric dispersant is the slurry stability that improves cured granulate, polymer such as optional cellulose family, non-hydrolyzed polyacrylamide, the preferred hydroxyethylcellulose of viscosity average molecular weigh about 1,000,000.
In above-mentioned stifled agent, the effect of said aqueous sodium carbonate is to suppress the contained calcium ions and magnesium ions of swell soil in the slurry, prevents its short slurry stability that influences with fixed attention.
Moisture in the used stifled agent of the present invention is higher, through improving the water/binder ratio of stifled agent, reduces the density of stifled agent.The controllable density of the stifled agent of the present invention is built in 1.07-1.14g/cm
3, density is constant before and after solidifying, and this moment, water ash mass ratio reached 4.07-6.28.The stifled agent of the present invention hardening time is 48-72h, and solidification intensity is 0.22-0.43MPa.
The preparation method of the used stifled agent of the present invention comprises: according to mass percent, the cement of solid phase, little silicon, sodium bentonite, polymeric dispersant are mixed, obtain the solid phase mixing ash; According to mass percent, retarding agent, aqueous sodium carbonate, water are mixed, obtain mixed solution; Stir down then and gradually said solid phase mixing ash is joined in the said mixed solution the stifled agent that formation mixes.
Adopt opposite joint of the present invention hole type oil reservoir to carry out the method for water blockoff; At least have following beneficial effect: the present invention uses the stifled agent opposite joint hole type oil reservoir of density between highly mineralized formation brines and crude oil to carry out water blockoff; Because used stifled agent density is low, can prevent effectively that stifled agent from causing leakage because of gravity; It is oil, water non-dispersed system for the stifled agent that the present invention uses, and will block up after agent injects the stratum, can reside on the oil-water interfaces of seam hole body to solidify, and realizes selective shut-off; Shutoff method of the present invention has good pump and annotates performance, can guarantee construction injection safety.
Description of drawings
Fig. 1 is the dynamic multiviscosisty curve of the stifled agent of embodiment 1.
Fig. 2 is the dynamic multiviscosisty curve of the stifled agent of embodiment 2.
Fig. 3 is the dynamic multiviscosisty curve of the stifled agent of embodiment 3.
Fig. 4 is the dynamic multiviscosisty curve of the stifled agent of embodiment 4.
Fig. 5 is the dynamic multiviscosisty curve of the stifled agent of embodiment 5.
Fig. 6 is the dynamic multiviscosisty curve of the stifled agent of embodiment 6.
Produce curve before and after Fig. 7 TH10421 well water blockoff.
The specific embodiment
For fully understanding the present invention's purpose, characteristic and effect,, the present invention is elaborated by following concrete embodiment.
Big to seam hole type oil reservoir reservoir space; Fluid is easy to the advantage through density phase double replacement, and the present invention adopts density between crude oil, formation water, and the profit stifled agent system of not disperseing; Utilize the gravity between formation water, stifled agent, the crude oil three; Make stifled agent selectivity resident and sprawl automatically on oil-water interfaces, and it solidifies the back and on oil-water interfaces, form dividing plate, stop end water to be invaded on too fast.The present invention is applicable to that formation water density is at 1.09g/cm
3Above high salt carbonate rock seam hole type oil reservoir selective water plugging, the used stifled agent system of the present invention can high temperature resistant (130 ℃), anti-high salt (23 * 10
4Mg/L).
Opposite joint hole type oil reservoir carries out the method for water blockoff; This method comprises: the stifled agent of selecting following composition for use; By percentage to the quality; Should stifled agent comprise: cement 5.24-9.36%, little silicon 3.03-5.35%, sodium bentonite 4.01-5.43%, polymeric dispersant 0.52-0.55%, retarding agent 0.17-0.40%, account for aqueous sodium carbonate and the water surplus of 0.0008-0.0011% in sodium carbonate, wherein, the water/binder ratio of this stifled agent is 4.07-6.28; Oil well is injected in said stifled agent, and vexed well is after at least 72 hours, opening well and making production.
Set forth the present invention through concrete embodiment below, one skilled in the art will appreciate that this should not be understood that the restriction to claim scope of the present invention.
Used raw material is bought from conventional commercially available among the embodiment, and Vad Petroleum Technology Co., Ltd, model HEC-3 are worn in the hydroxyethylcellulose purchase from the Kuerle.The seam hole conventional water-plugging technology of type oil reservoir all can be applicable to the present invention with sealing compound, and used sealing compound main component is density 1.5-1.8g/cm in following examples
3Cementing concrete.
Among the following embodiment during product analysis used stifled agent preparation method, determinator and assay method specify as follows all with reference to GB/T 19139-2003 oil well cement test method:
Density measuring device and method: adopt the fluid under pressure densometer, measure according to the 6th cement slurry density method for measuring in the GB/T 19139-2003 oil well cement test method.
Dehydration determinator and method: adopt high-temperature and high-pressure filter press, measure according to the method for the 10th quiet loss-of-coolant experiment (LOCE) in the GB/T 19139-2003 oil well cement test method.
Bleed and 4stability determination: adopt the 250mL glass cylinder, measure according to the 15.5th method that leaves standstill the free liquid test of cement paste at room temperature environment in the GB/T 19139-2003 oil well cement test method.Leave standstill 2h, measure the free liquid volume and be accurate to ± 0.2mL.
Stifled agent piece preparation method and intensity test method: according to the method for the 7th oil well simulation compressive strength test in the GB/T 19139-2003 oil well cement test method; Adopt 50.8mm * 50.8mm * 50.8mm standard die trial; Maintenance and the stifled agent piece of preparation adopt pressure testing machine to measure compressive strength under reservoir temperature.
Multiviscosisty assay method:, under reservoir temperature, pressure, adopt HTHP multiviscosisty appearance to measure according to the method for the 9th oil well simulation thickening time test in the GB/T 19139-2003 oil well cement test method.
Static hardening time assay method: adopt 50.8mm * 50.8mm * 50.8mm standard die trial; (120 ℃ of HTHP maintenances; 20.7MPa); Whether fully every interval 12h takes out and investigates curing, and maintenance process is according to the 7th oil well simulation compressive strength test in the GB/T 19139-2003 oil well cement test method.
Degree of mobilization assay method: will block up agent and inject rapidly in the truncated cone circle mould; Use doctor blade; Truncated cone circle mould is mentioned by vertical direction, begin simultaneously to clock, when appointing stifled agent on glass plate, to flow to 30s; Measure the maximum gauge of trickling part mutually perpendicular both direction with ruler, average is degree of mobilization.
Stifled agent prepares embodiment
Earlier with cement (D
50Be 1 μ m) 45g (5.24% quality), little silicon (D
50Being 60nm) 26g (3.03% quality), sodium bentonite 40g (4.66% quality), hydroxyethylcellulose (viscosity average molecular weigh is 1,000,000) 4.7g (0.55% quality) be mixed, is made into combination ash; The aqueous sodium carbonate 0.8g (0.09% quality) of ethylenediamine tetramethylene phosphonic acid calcium 1.5g (0.17% quality), mass concentration 1% is added in the arm stirrer that 741g water (86.26% quality) is housed; Be made into mixed solution; And then slowly add combination ash in the mixed solution; Stir, form the stifled agent sample 1# in laboratory.This sample water gray scale is 6.28.
Earlier with cement (D
50Be 0.9 μ m) 49g (5.74% quality), little silicon (D
50Being 50nm) 28g (3.28% quality), sodium bentonite 43g (5.03% quality), hydroxyethylcellulose (viscosity average molecular weigh is 1,000,000) 4.6g (0.54% quality) be mixed, is made into combination ash; The aqueous sodium carbonate 0.86g (0.10% quality) of sodium ethylenediamine tetramethylenephosphonate 1.6g (0.19% quality), mass concentration 1% is added in the arm stirrer that 727g water (85.12% quality) is housed; Be made into mixed solution; And then slowly add combination ash in the mixed solution; Stir, form the stifled agent sample 2# in laboratory.This sample water gray scale is 5.72.
Earlier with cement (D
50Be 0.9 μ m) 54g (6.38% quality), little silicon (D
50Being 40nm) 31g (3.66% quality), sodium bentonite 46g (5.43% quality), hydroxyethylcellulose (viscosity average molecular weigh is 1,000,000) 4.5g (0.54% quality) mix, and is made into combination ash; The aqueous sodium carbonate 0.92g (0.11% quality) of ethylenediamine pentamethylene phosphonic acids 2.0g (0.24% quality), mass concentration 1% is added in the arm stirrer that 708g water (83.64% quality) is housed; Be made into mixed solution; And then slowly add combination ash in the mixed solution; Stir, form the stifled agent sample 3# in laboratory.This sample water gray scale is 5.11.
Embodiment 4
Earlier with cement (D
50Be 0.9 μ m) 64g (7.26% quality), little silicon (D
50Being 40nm) 36g (4.09% quality), sodium bentonite 46g (5.22% quality), hydroxyethylcellulose (viscosity average molecular weigh is 1,000,000) 4.7g (0.53% quality) mix, and is made into combination ash; The aqueous sodium carbonate 0.92g (0.10% quality) of ethylenediamine pentamethylene phosphonic acids 2.4g (0.27% quality), mass concentration 1% is added in the arm stirrer that 727g (85.52% quality) water is housed; Be made into mixed solution; And then slowly add combination ash in the mixed solution; Stir, form the stifled agent sample 4# in laboratory.This sample water gray scale is 4.72.
Embodiment 5
Earlier with cement (D
50Be 0.8 μ m) 70g (8.25% quality), little silicon (D
50Being 30nm) 40g (4.72% quality), sodium bentonite 40g (4.72% quality), hydroxyethylcellulose (viscosity average molecular weigh is 1,000,000) 4.5g (0.53% quality) mix, and is made into combination ash; The aqueous sodium carbonate 0.8g (0.09% quality) of sodium ethylenediamine tetramethylenephosphonate 2.8g (0.33% quality), mass concentration 1% is added in the arm stirrer that 690g (81.36% quality) water is housed; Be made into mixed solution; And then slowly add combination ash in the mixed solution; Stir, form the stifled agent sample 5# in laboratory.This sample water gray scale is 4.37.
Earlier with cement (D
50Be 0.8 μ m) 70g (9.36% quality), little silicon (D
50Being 20nm) 40g (5.35% quality), sodium bentonite 30g (4.01% quality), hydroxyethylcellulose (viscosity average molecular weigh is 1,000,000) 3.9g (0.52% quality) mix, and is made into combination ash; The aqueous sodium carbonate 0.6g (0.08% quality) of ethylenediamine tetramethylene phosphonic acid calcium 3.0g (0.40% quality), mass concentration 1% is added in the arm stirrer that 600g (80.27% quality) water is housed; Be made into mixed solution; And then slowly add combination ash in the mixed solution; Stir, form the stifled agent sample 6# in laboratory.This sample water gray scale is 4.07.
The effect experiment
Adopt the 7th oil well simulation compressive strength test in the GB/T 19139-2003 oil well cement test method, will block up agent 1#-6# slurry and be sealed in the die trial, (120 ℃, 20.7MPa) 48h solidifies the back and forms isopyknic stifled agent piece in the HTHP maintenance.
Then the stifled agent piece of 1#-6# is placed on kerosene and density 1.14g/cm
3Formation water (formation water density 1.14g/cm
3, salinity 23 * 10
4Mg/L, calcium ions and magnesium ions content about 1 * 10
4Mg/L) between, visible stifled agent piece swims on the oil-water interfaces, shows because the density of stifled agent between highly mineralized formation brines and crude oil, therefore can be sprawled on the oil-water interfaces of seam hole system automatically.
Adopt said method, stifled agent 1#-6# is tested, the result is as shown in the table:
Fig. 1-shown in Figure 6 is the HTHP multiviscosisty curve of the slurry of stifled agent 1#-6#.Abscissa is time shaft (hour-minute), ordinate be respectively temperature (℃), pressure (MPa), denseness (Bc).Investigate 120 ℃ of temperature, investigate pressure 75MPa, the increasing temperature and pressure time set is 70min.Experimental facilities adopts HTHP multiviscosisty appearance.Visible by the dynamic multiviscosisty curve of 8h, the slurry denseness is basicly stable below 10Bc, particularly between the 2.0-6.5, explains that the stifled agent of the present invention has good pump and annotates performance, can guarantee construction injection safety.
As above shown in the table, be 48-72h the static hardening time of stifled agent 1#-6#, and therefore in order to ensure solidifying fully, the closed-in time is decided to be 72h at least after the stifled agent of use the present invention.
To block up agent 1#-6# and solidify to form each 10 of stifled agent pieces, airtight aging under 130 ℃ in conventional high temperature multiviscosisty appearance respectively then, whenever took out an observation, accumulation observation 30 days at a distance from 3 days.Do not find any degraded and volume contraction phenomenon in this experiment, show that stifled agent has good stable property.
The field trial example
Use like the prepared stifled agent of embodiment 6 at system in Tahe Oilfield carbonate oil reservoir (120 ℃ of reservoir temperatures, formation water density 1.14g/cm
3, salinity 23 * 10
4Mg/L, calcium ions and magnesium ions content about 1 * 10
4Mg/L) use 7 mouthfuls of wells, 8 wells are inferior.Be respectively twice in TH10421 well, TK847 well, TK834 well, TK744, TK666, TK608, TK1103, be seam hole type profit with the section withdrawal well.Plug agent amount is designed to: when acid fracturing simulation fracture volume or communication reservoir bodies, stifled agent use amount is the 1/2-2/3 of fracturing fluid consumption.Without the acid fracturing well, with plugged well section 5-20m
3/ m calculates, and in the site operation, discharge capacity 300-800L/min adopts conventional oil pipe to inject above-mentioned oil well, and vexed well is after 72 hours, opening well and making production.8 wells time water blockoff, 6 wells obviously take effect (increase oil and surpass 400t), and be efficient 75%, and accumulative total increases oily 8750t.
The TH10421 well is for directly to go into operation without acid fracturing, and is moisture 95% before the water blockoff, plug face 6129.04m, and the only surplus 14.04m of pit shaft bore hole section belongs to seam hole type profit with a section withdrawal well.Can find out that from Fig. 7 water blockoff is carried out in the stifled agent of twice employing embodiment 3, all obtains positive effect.Wherein construction for the first time, accumulative total is injected 1.14g/cm
3Low-density is blocked up agent 86.8m
3, 1.53g/cm
3Cementing concrete (sealing compound) 6.8m
3, discharge capacity 380L/min, formation leakage is serious, and stifled agent normally gets into the stratum and does not play pressure, and casing pressure is always 0, and stifled back plug face is constant.After using the stifled agent of the present invention, the decreasing water cut and increasing oil effect is obvious.Electric pump production is a day production fluid 11.7t before stifled, day produce oil 0.59t, moisture 95%.The initial stage oil nozzle blowing of stifled back is produced, day production fluid 30t, and day produce oil 29.7t, moisture hardly, promptly tiredly increase oily 1656t.
Along with water plugging effect variation gradually, moisturely reach 98% once more, the stifled agent 120m of the embodiment of the invention 6 is used in construction for the second time
3, 1.53g/cm
3Cementing concrete (sealing compound) 15m
3, discharge capacity 740L/min crosses replacement 6m
3, recover blowing once more after blocking up, accumulative total has increased oily 4282t.
The TK847 well is that acid fracturing is gone into operation potentiality segment length 6.5m.Fracturing fluid consumption 210m
3, accumulative total is injected 1.14g/cm
3Low-density is blocked up agent 86.8m
3, discharge capacity 380L/min.Accumulative total has increased oily 1430t, and period of validity was above 190 days.The model that fracturing fluid (tell and the breathe out Oilfield Company) company that adopts sells is the fracturing fluid goods of (TH-GYL); It consists of: (0.5%) HPG melon glue (guar gum hydroxypropyl-trimethyl ammonium chloride)+(1.0%) LZ-1 cleanup additive+(1.0%) LP-1 demulsifier+(0.1%) LK-7 bactericide+(0.02%) pH value conditioning agent+(0.3%) LK-6 temperature stability agent+(1.0%) LK-8 clay stabilizer+(6%) LK-9 organic borate cross-linker+(1.0%) EFR friction reducer, all the other are water.Wherein, melon glue is generally the guar gum hydroxypropyl-trimethyl ammonium chloride.
The TK834 well is that acid fracturing is gone into operation potentiality segment length 13m.Above-mentioned identical fracturing fluid consumption 286m
3, accumulative total is injected 1.14g/cm
3Low-density is blocked up agent 121m
3, discharge capacity 380L/min.Accumulative total has increased oily 538t, and period of validity was above 170 days.
Shutoff method of the present invention can high temperature resistant (130 ℃), anti-high salt (23 * 10
4Mg/L), utilize its water blockoff system low-density characteristic, stifled agent is detained the dividing plate that solidify to form selective water plugging at oil-water interfaces, and it is blank to have filled up the hole type oil reservoir density selective blocking agent of domestic and international high temperature and high salt carbonate rock seam.Shutoff method of the present invention has a extensive future, and has stronger compliance, has promotional value.
Claims (9)
1. an opposite joint hole type oil reservoir carries out the method for water blockoff; This method comprises: the stifled agent of selecting following composition for use; By percentage to the quality; Said stifled agent comprises: cement 5.24-9.36%, little silicon 3.03-5.35%, sodium bentonite 4.01-5.43%, polymeric dispersant 0.52-0.55%, retarding agent 0.17-0.40%, account for aqueous sodium carbonate and the water surplus of 0.0008-0.0011% in sodium carbonate, wherein, the water/binder ratio of this stifled agent is 4.07-6.28; Oil well is injected in said stifled agent, and vexed well is after at least 72 hours, opening well and making production.
2. opposite joint according to claim 1 hole type oil reservoir carries out the method for water blockoff, it is characterized in that said plug agent amount is designed to: plug agent amount is the 1/2-2/3 of fracturing fluid consumption when acid fracturing simulation fracture volume or communication reservoir bodies; During without the acid fracturing well with plugged well section 5-20m
3/ m, preferred 6.182-8.547m
3/ m calculates.
3. opposite joint according to claim 1 and 2 hole type oil reservoir carries out the method for water blockoff, it is characterized in that, according to the 300-800L/min discharge capacity, oil well is injected in said stifled agent.
4. carry out the method for water blockoff according to each described opposite joint hole type oil reservoir of claim 1-3; It is characterized in that; By percentage to the quality; Said stifled agent comprises: cement 5.74-8.25%, little silicon 3.28-4.72%, sodium bentonite 4.72-5.43%, polymeric dispersant 0.53-0.54%, retarding agent 0.19-0.33%, account for aqueous sodium carbonate and the water surplus of 0.0009-0.0011% in sodium carbonate, wherein, the water/binder ratio of this stifled agent is 4.37-5.72.
5. carry out the method for water blockoff according to each described opposite joint hole type oil reservoir of claim 1-4, it is characterized in that said cement median particle diameter D
50For smaller or equal to 1 μ m, preferred 0.8-1 μ m.
6. carry out the method for water blockoff according to each described opposite joint hole type oil reservoir of claim 1-5, it is characterized in that the median particle diameter D of said little silicon
50Between 20-60nm.
7. carry out the method for water blockoff according to each described opposite joint hole type oil reservoir of claim 1-6, it is characterized in that said retarding agent is ethylenediamine tetramethylene phosphonic acid calcium, sodium ethylenediamine tetramethylenephosphonate or ethylenediamine pentamethylene phosphonic acids.
8. carry out the method for water blockoff according to each described opposite joint hole type oil reservoir of claim 1-7, it is characterized in that, said polymeric dispersant is a viscosity average molecular weigh at 1,000,000 hydroxyethylcellulose.
9. carry out the method for water blockoff according to each described opposite joint hole type oil reservoir of claim 1-8, it is characterized in that the density of said stifled agent is 1.07-1.14g/cm
3, solidification intensity is 0.22-0.43MPa.
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