CA2661725A1 - Method and system for accessing subterranean deposits from the surface - Google Patents
Method and system for accessing subterranean deposits from the surface Download PDFInfo
- Publication number
- CA2661725A1 CA2661725A1 CA002661725A CA2661725A CA2661725A1 CA 2661725 A1 CA2661725 A1 CA 2661725A1 CA 002661725 A CA002661725 A CA 002661725A CA 2661725 A CA2661725 A CA 2661725A CA 2661725 A1 CA2661725 A1 CA 2661725A1
- Authority
- CA
- Canada
- Prior art keywords
- well bore
- drilling
- subterranean zone
- substantially horizontal
- fluid
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract 25
- 238000005553 drilling Methods 0.000 claims abstract 37
- 239000012530 fluid Substances 0.000 claims abstract 28
- 230000002706 hydrostatic effect Effects 0.000 claims abstract 7
- 239000003245 coal Substances 0.000 claims 8
- 238000005086 pumping Methods 0.000 claims 6
- 230000015572 biosynthetic process Effects 0.000 claims 4
- 238000005520 cutting process Methods 0.000 claims 2
- 239000006260 foam Substances 0.000 claims 2
- 239000007788 liquid Substances 0.000 claims 2
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/09—Locating or determining the position of objects in boreholes or wells, e.g. the position of an extending arm; Identifying the free or blocked portions of pipes
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/006—Production of coal-bed methane
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/12—Methods or apparatus for controlling the flow of the obtained fluid to or in wells
- E21B43/121—Lifting well fluids
- E21B43/13—Lifting well fluids specially adapted to dewatering of wells of gas producing reservoirs, e.g. methane producing coal beds
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/30—Specific pattern of wells, e.g. optimizing the spacing of wells
- E21B43/305—Specific pattern of wells, e.g. optimizing the spacing of wells comprising at least one inclined or horizontal well
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/04—Directional drilling
- E21B7/046—Directional drilling horizontal drilling
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F7/00—Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose
Abstract
A method for accessing a subterranean zone from a surface includes forming a substantially horizontal well bore. The substantially horizontal well bore is formed by a drill string to which drilling fluids are supplied.
Hydrostatic pressure exerted by the drilling fluids is reduced.
Hydrostatic pressure exerted by the drilling fluids is reduced.
Claims (23)
1. A method for accessing a subterranean zone from a surface, comprising:
forming a first well bore extending from the surface to the subterranean zone;
forming a second well bore extending from the surface to the subterranean zone, the second well bore intersecting the first well bore at a junction proximate to the subterranean zone; and forming, through the second well bore, a well bore pattern from the junction into the subterranean zone, wherein forming the well bore pattern comprises:
forming the well bore pattern using an articulated drill string extending through the second well bore and the junction;
supplying drilling fluid through the articulated drill string to remove cuttings generated by the drill string; and pumping the drilling fluid with the cuttings to the surface through the first well bore to minimize hydrostatic pressure on the subterranean zone during drilling of the drainage pattern.
forming a first well bore extending from the surface to the subterranean zone;
forming a second well bore extending from the surface to the subterranean zone, the second well bore intersecting the first well bore at a junction proximate to the subterranean zone; and forming, through the second well bore, a well bore pattern from the junction into the subterranean zone, wherein forming the well bore pattern comprises:
forming the well bore pattern using an articulated drill string extending through the second well bore and the junction;
supplying drilling fluid through the articulated drill string to remove cuttings generated by the drill string; and pumping the drilling fluid with the cuttings to the surface through the first well bore to minimize hydrostatic pressure on the subterranean zone during drilling of the drainage pattern.
2. The method of Claim 1, wherein the subterranean zone comprises a low pressure reservoir having a pressure below 250 pounds per square inch (psi).
3. The method of Claim 1, further comprising:
forming an enlarged cavity in the first well bore proximate to the subterranean zone;
drilling the second well bore to intersect the large cavity of the first well bore; and drilling, through the second well bore, the well bore pattern from the enlarged cavity into the subterranean zone.
forming an enlarged cavity in the first well bore proximate to the subterranean zone;
drilling the second well bore to intersect the large cavity of the first well bore; and drilling, through the second well bore, the well bore pattern from the enlarged cavity into the subterranean zone.
4. The method of Claim 3, further comprising:
collecting fluid from the well bore pattern in the enlarged cavity; and producing the fluid from the enlarged cavity through the first well bore.
collecting fluid from the well bore pattern in the enlarged cavity; and producing the fluid from the enlarged cavity through the first well bore.
5. The method of Claim 1, wherein the subterranean zone comprises a coal seam.
6. The method of Claim 1, wherein the subterranean zone comprises an oil reservoir.
7. The method of Claim 1, further comprising:
producing fluid from the subterranean zone through the well bore pattern; and producing the fluid from the well bore pattern through first well bore.
producing fluid from the subterranean zone through the well bore pattern; and producing the fluid from the well bore pattern through first well bore.
8. A method for drilling a well in a coal seam, comprising:
pumping a drilling fluid comprising a liquid down a drill string to a bit drilling a substantially horizontal well bore in a coal seam;
pumping the drilling fluid down the drill string during drilling a plurality of lateral well bores in the coal seam off of the substantially horizontal well bore;
and reducing down-hole pressure exerted by the drilling fluid by reducing a weight of drilling fluid in the well bore.
pumping a drilling fluid comprising a liquid down a drill string to a bit drilling a substantially horizontal well bore in a coal seam;
pumping the drilling fluid down the drill string during drilling a plurality of lateral well bores in the coal seam off of the substantially horizontal well bore;
and reducing down-hole pressure exerted by the drilling fluid by reducing a weight of drilling fluid in the well bore.
9. The method of Claim 8, further comprising reducing down-hole pressure exerted by the drilling fluid by lightening the hydrostatic pressure of the drilling fluid.
10. The method of Claim 8, further comprising reducing down-hole pressure exerted by the drilling fluid by aerating the drilling fluid.
11. The method of Claim 8, further comprising reducing down-hole pressure exerted by the drilling fluid by circulating compressed air and mixing the air with the drilling fluid.
12. The method of Claim 8, further comprising reducing down-hole pressure to nearly zero.
13. The method of Claim 8, further comprising reducing down-hole pressure below over balanced conditions.
14. The method of Claim 8, further comprising reducing down-hole pressure to approximately 150-200 pounds per square inch.
15. The method of Claim 8, further comprising drilling the substantially horizontal well bore through a well bore having a radiused portion.
16. The method of Claim 8, wherein the drilling fluid comprises foam.
17. A method for accessing a subterranean coal formation from the surface, comprising:
drilling a substantially horizontal well bore in the coal formation;
during drilling of the substantially horizontal well bore in the coal formation, reducing the weight of drilling fluids, the drilling fluids comprising liquid;
drilling a plurality of lateral well bores from the substantially horizontal well bore; and during drilling of the plurality of lateral well bores, lightening hydrostatic pressure exerted by drilling fluids on the coal formation.
drilling a substantially horizontal well bore in the coal formation;
during drilling of the substantially horizontal well bore in the coal formation, reducing the weight of drilling fluids, the drilling fluids comprising liquid;
drilling a plurality of lateral well bores from the substantially horizontal well bore; and during drilling of the plurality of lateral well bores, lightening hydrostatic pressure exerted by drilling fluids on the coal formation.
18. The method of Claim 17, further comprising lightening hydrostatic pressure exerted by the drilling fluids by pumping the drilling fluids from the substantially horizontal well bore to the surface.
19. The method of Claim 18, further comprising pumping the drilling fluids using gas lift.
20. The method of Claim 18, further comprising pumping drilling fluids from the substantially horizontal well bore to the surface through a second well bore intercepting the substantially horizontal well bore.
21. The method of Claim 17, wherein lightening hydrostatic pressure exerted by drilling fluids comprises lightening hydrostatic pressure exerted by drilling mud.
22. The method of Claim 17, further comprising drilling the substantially horizontal well bore through a well bore having a radiused portion.
23. The method of Claim 17, wherein the drilling fluid comprises foam.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA2792184A CA2792184A1 (en) | 1998-11-20 | 1999-11-19 | Method and system for accessing subterranean deposits from the surface |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/197,687 US6280000B1 (en) | 1998-11-20 | 1998-11-20 | Method for production of gas from a coal seam using intersecting well bores |
US09/197,687 | 1998-11-20 | ||
CA002589332A CA2589332C (en) | 1998-11-20 | 1999-11-19 | Method and system for accessing subterranean deposits from the surface |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA002589332A Division CA2589332C (en) | 1998-11-20 | 1999-11-19 | Method and system for accessing subterranean deposits from the surface |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA2792184A Division CA2792184A1 (en) | 1998-11-20 | 1999-11-19 | Method and system for accessing subterranean deposits from the surface |
Publications (2)
Publication Number | Publication Date |
---|---|
CA2661725A1 true CA2661725A1 (en) | 2000-06-02 |
CA2661725C CA2661725C (en) | 2013-01-08 |
Family
ID=22730357
Family Applications (9)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA002441672A Expired - Fee Related CA2441672C (en) | 1998-11-20 | 1999-11-19 | Method and system for accessing subterranean deposits from the surface |
CA002441667A Expired - Fee Related CA2441667C (en) | 1998-11-20 | 1999-11-19 | Method and system for accessing subterranean deposits from the surface |
CA002350504A Expired - Fee Related CA2350504C (en) | 1998-11-20 | 1999-11-19 | Method and system for accessing subterranean deposits from the surface |
CA002483023A Expired - Fee Related CA2483023C (en) | 1998-11-20 | 1999-11-19 | Method and system for accessing subterranean deposits from the surface |
CA002441671A Expired - Fee Related CA2441671C (en) | 1998-11-20 | 1999-11-19 | Method and system for accessing subterranean deposits from the surface |
CA002447254A Expired - Fee Related CA2447254C (en) | 1998-11-20 | 1999-11-19 | Well cavity positioning method |
CA2792184A Abandoned CA2792184A1 (en) | 1998-11-20 | 1999-11-19 | Method and system for accessing subterranean deposits from the surface |
CA002589332A Expired - Fee Related CA2589332C (en) | 1998-11-20 | 1999-11-19 | Method and system for accessing subterranean deposits from the surface |
CA2661725A Expired - Fee Related CA2661725C (en) | 1998-11-20 | 1999-11-19 | Method and system for accessing subterranean deposits from the surface |
Family Applications Before (8)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA002441672A Expired - Fee Related CA2441672C (en) | 1998-11-20 | 1999-11-19 | Method and system for accessing subterranean deposits from the surface |
CA002441667A Expired - Fee Related CA2441667C (en) | 1998-11-20 | 1999-11-19 | Method and system for accessing subterranean deposits from the surface |
CA002350504A Expired - Fee Related CA2350504C (en) | 1998-11-20 | 1999-11-19 | Method and system for accessing subterranean deposits from the surface |
CA002483023A Expired - Fee Related CA2483023C (en) | 1998-11-20 | 1999-11-19 | Method and system for accessing subterranean deposits from the surface |
CA002441671A Expired - Fee Related CA2441671C (en) | 1998-11-20 | 1999-11-19 | Method and system for accessing subterranean deposits from the surface |
CA002447254A Expired - Fee Related CA2447254C (en) | 1998-11-20 | 1999-11-19 | Well cavity positioning method |
CA2792184A Abandoned CA2792184A1 (en) | 1998-11-20 | 1999-11-19 | Method and system for accessing subterranean deposits from the surface |
CA002589332A Expired - Fee Related CA2589332C (en) | 1998-11-20 | 1999-11-19 | Method and system for accessing subterranean deposits from the surface |
Country Status (15)
Country | Link |
---|---|
US (12) | US6280000B1 (en) |
EP (4) | EP1131535B1 (en) |
CN (5) | CN101328791A (en) |
AT (4) | ATE480694T1 (en) |
AU (9) | AU760896B2 (en) |
CA (9) | CA2441672C (en) |
CZ (1) | CZ20011757A3 (en) |
DE (4) | DE69942756D1 (en) |
ES (3) | ES2297582T3 (en) |
ID (1) | ID30391A (en) |
NZ (3) | NZ512303A (en) |
PL (9) | PL193558B1 (en) |
RU (6) | RU2505657C2 (en) |
WO (1) | WO2000031376A2 (en) |
ZA (1) | ZA200103917B (en) |
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