CA2436059A1 - Method and system for accessing subterranean zones from a limited surface area - Google Patents

Method and system for accessing subterranean zones from a limited surface area Download PDF

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Publication number
CA2436059A1
CA2436059A1 CA002436059A CA2436059A CA2436059A1 CA 2436059 A1 CA2436059 A1 CA 2436059A1 CA 002436059 A CA002436059 A CA 002436059A CA 2436059 A CA2436059 A CA 2436059A CA 2436059 A1 CA2436059 A1 CA 2436059A1
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CA
Canada
Prior art keywords
well bore
extending
target zone
pattern
forming
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
Application number
CA002436059A
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French (fr)
Other versions
CA2436059C (en
Inventor
Joseph A. Zupanick
Monty H. Rial
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
CDX Gas LLC
Original Assignee
Cdx Gas, L.L.C.
Joseph A. Zupanick
Monty H. Rial
Priority date (The priority date 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 date listed.)
Filing date
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Application filed by Cdx Gas, L.L.C., Joseph A. Zupanick, Monty H. Rial filed Critical Cdx Gas, L.L.C.
Publication of CA2436059A1 publication Critical patent/CA2436059A1/en
Application granted granted Critical
Publication of CA2436059C publication Critical patent/CA2436059C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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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
    • 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
    • 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
    • E21B43/30—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

Abstract

A method and system for accessing subterranean zones from the surface includes a substantially vertical well bore (210) extending from the surface to a target zone (15), and an articulated well bore (230) extending from the substantially vertical well bore to the target zone. The articulated well bore diverges from the substantially vertical well bore between the surface and the target zone. The system also includes a well bore pattern (50) extending from the articulated well bore in the target zone operable to collect resources from the target zone. The system also includes a subsurface channel operable to communicate resources from the well bore pattern to the substantially vertical well bore. The system further includes a vertical pump (80) disposed in the substantially vertical well bore and operable to lift resources collected in the substantially vertical well bore to the surface.

Claims (64)

1. A method for accessing a subsurface formation from the surface, comprising:
providing a substantially vertical well bore from a surface to a target zone;
providing a first articulated well bore extending from the substantially vertical well bore to the target zone, the first articulated well bore diverging from the substantially vertical well bore between the surface and the target zone;
providing a second articulated well bore extending from the substantially vertical well bore and intersecting the first articulated well bore at a junction proximate the target zone; and forming a well bore pattern extending from the junction into the target zone.
2. The method of Claim 1, further comprising removing resources from the target zone through the substantially vertical well bore.
3. The method of Claim 1, wherein forming the well bore pattern comprises forming the well bore pattern through the first articulated well bore.
4. The method of Claim 1, wherein forming the well bore pattern comprises forming the well bore pattern through the second articulated well bore.
5. The method of Claim 1, further comprising forming an enlarged cavity in the target zone at an end of the well bore pattern proximate to the first and second articulated well bores, the second articulated well bore communicating between the substantially vertical well bore and the enlarged cavity.
6. The method of Claim 5, wherein forming the enlarged cavity comprises forming an enlarged diameter cavity.
7. The method of Claim 5, wherein forming the enlarged cavity comprises forming the enlarged cavity substantially within a coal seam.
8. The method of Claim 5, wherein forming the well bore pattern comprises:
forming a main well bore extending from the enlarged cavity into the target zone;
and forming a plurality of lateral well bores extending outwardly from opposite sides of the main well bore.
9. The method of Claim 8, wherein forming the lateral well bores comprises forming the lateral well bores substantially equally spaced apart from each other.
10. The method of Claim 1, wherein forming the well bore pattern comprises forming a pinnate well bore pattern.
11. The method of Claim 10, wherein forming the pinnate well bore pattern comprises forming a plurality of lateral well bores extending from a main well bore into the target zone.
12. The method of Claim 1, further comprising:
disposing a vertical pump in the substantially vertical well bore; and removing resources collected in the substantially vertical well bore to the surface using the vertical pump.
13. The method of Claim 12, wherein disposing the vertical pump comprises providing a sucker-rod pump.
14. A method for extracting resources from a subsurface formation, comprising:
providing a substantially vertical well bore from a surface to a first target zone and a second target zone;
providing a first articulated well bore extending from the substantially vertical well bore to the first target zone, the first articulated well bore diverging from the substantially vertical well bore between the surface and the first target zone;
providing a second articulated well bore extending from the substantially vertical well bore and intersecting the first articulated well bore at a first junction proximate the first target zone;
providing a first well bore pattern extending from the first junction into the first target zone;
removing resources from the first target zone through the substantially vertical well bore;
providing a third articulated well bore extending from the substantially vertical well bore to the second target zone, the third articulated well bore diverging from the substantially vertical well bore between the surface and the second target zone;
providing a fourth articulated well bore extending from the substantially vertical well bore and intersecting the third articulated well bore at a second junction proximate the second target zone;
providing a second well bore pattern extending from the second junction into the second target zone; and removing resources from the second target zone through the substantially vertical well bore.
15. The method of Claim 14, wherein providing the first and second well bore patterns comprises forming the first and second well bore patterns through the respective first and third articulated well bores.
16. The method of Claim 14, further comprising:
providing a first cavity in the first target zone at an end of the first well bore pattern proximate to the first junction, the second articulated well bore communicating between the substantially vertical well bore and the first cavity; and providing a second cavity in the second target zone at an end of the second well bore pattern proximate to the second junction, the fourth articulated well bore communicating between the substantially vertical well bore and the second cavity.
17. The method of 16, wherein providing the first and second cavities comprises providing the first and second cavities disposed substantially within the respective first and second target zones.
18. The method of Claim 14, wherein providing the second and fourth articulated well bores comprises providing the second and fourth articulated well bores disposed substantially within the respective first and second target zones.
19. The method of Claim 14, wherein providing the first and second well bore patterns comprise providing pinnate well bore patterns.
20. A system for accessing a subsurface formation from the surface, comprising:
a first well bore extending downwardly from the surface;
a second well bore extending from the first well bore to a target zone, the second well bore diverging from the first well bore between the surface and the target zone;
a third well bore extending from the first well bore and intersecting the second well bore at a junction proximate the target zone; and a well bore pattern extending from the junction into the target zone.
21. The system of Claim 20, further comprising a cavity disposed within the target zone at an end of the well bore pattern proximate to the junction, the third well bore providing communication between the cavity and the first well bore.
22. The system of Claim 20, further comprising a pump disposed in the first well bore and operable to lift resources collected in the first well bore to the surface.
23. The system of Claim 22, wherein the pump comprises a sucker-rod pump.
24. The system of Claim 20, wherein the third well bore is disposed substantially within the target zone.
25. The system of Claim 20, wherein the well bore pattern comprises a pinnate well bore pattern.
26. The system of Claim 20, wherein the well bore pattern comprises:
a main well bore extending from the junction; and a plurality of lateral well bores extending outwardly from the main well bore.
27. The system of Claim 26, wherein the plurality of lateral well bores are disposed substantially equally spaced apart from each other.
28. A system for extracting resources from a subsurface formation, comprising:
a substantially vertical well bore extending from a surface to a first target zone and a second target zone;
a first articulated well bore extending from the substantially vertical well bore to the first target zone, the first articulated well bore diverging from the substantially vertical well bore between the surface and the first target zone;
a first well bore pattern extending from the first articulated well bore in the first target zone operable to collect resources from the first target zone;
a second articulated well bore operable to communicate resources from the first well bore pattern to the substantially vertical well bore;

a third articulated well bore extending from the substantially vertical well bore to the second target zone, the third articulated well bore diverging from the substantially vertical well bore between the surface and the second target zone;
a second well bore pattern extending from the third articulated well bore in the second target zone operable to collect resources from the second target zone;
a fourth articulated well bore operable to communicate resources from the second well bore pattern to the substantially vertical well bore; and a vertical pump disposed in the substantially vertical well bore and operable to lift the resources collected in the substantially vertical well bore to the surface.
29. The system of Claim 28, further comprising:
a first cavity disposed within the first target zone at an end of the first well bore pattern proximate to the first articulated well bore, the second articulated well bore operable to communicate the resources from the first cavity to the substantially vertical well bore; and a second cavity disposed within the second target zone at an end of the second well bore pattern proximate to the third articulated well bore, the fourth articulated well bore operable to communicate the resources from the second cavity to the substantially vertical well bore.
30. The system of Claim 28, wherein the second and fourth articulated well bore are disposed substantially within the respective first and second target zones.
31. The system of Claim 28, wherein the first and second well bore patterns comprise pinnate well bore patterns.
32. The system of Claim 31, wherein each pinnate well bore pattern comprises a plurality of lateral well bores extending from a respective main well bore disposed substantially within a respective target zone.
33 33. The system of Claim 28, wherein the vertical pump comprises a sucker-rod pump.
34. The system of Claim 28, wherein each of the first and second well bore patterns comprise:
a substantially horizontal diagonal well bore extending from a first end of an area of a subterranean zone to a second end of the area of the subterranean zone;
and a plurality of lateral well bores extending in spaced apart relation to each other from the diagonal well bore to a periphery of the area.
35. The system of Claim 34, wherein the first end of the area is disposed proximate the respective first and third articulated well bores, and wherein a length of the lateral well bores progressively decreases as a distance between the lateral well bore and the first end increases.
36. A method for accessing a subsurface formation from the surface, comprising:
forming a first well bore extending downwardly from the surface;
forming a second well bore spaced apart from the first well bore at the surface, the second well bore having a first portion intersecting the first well bore at a first location and a second portion intersecting the first well bore at a second location;
forming a first well bore pattern extending from the first portion into a first target zone; and forming a second well bore pattern extending from the second portion into a second target zone.
37. The method of Claim 36, further comprising forming a first cavity and a second cavity in the first well bore, the first cavity disposed in the first target zone and the second cavity disposed in the second target zone.
38. The method of Claim 36, wherein providing the first and second well bore patterns comprises providing first and second pinnate well bore patterns.
39. The method of Claim 36, wherein forming the first and second portions comprises forming the first and second portions substantially within the respective first and second target zones.
40. The method of Claim 36, further comprising removing the resources from the first and second target zones through the first well bore.
41. The method of Claim 36, further comprising providing a vertical pump disposed in the first well bore to lift the resources collected in the first well bore to the surface.
42. A substantially horizontal subterranean drainage pattern for accessing an area of a subterranean zone from the surface, comprising:
a substantially horizontal diagonal well bore extending from a surface well bore defining a first end of the area in the subterranean zone to a distant end of the area;
a first set of substantially horizontal lateral well bores extending in a spaced apart relation to each other from the diagonal well bore to a periphery of the area on a first side of the diagonal well bore and comprising a short reversal of radius proximate to the substantially horizontal diagonal well bore; and a second set of substantially horizontal lateral well bores extending in a spaced apart relation to each other from the diagonal well bore to a periphery of the area on aside of the diagonal well bore opposite the first set of lateral well bores.
43. The subterranean drainage pattern of Claim 42, wherein a length of the lateral well bores progressively decreases as a distance from the lateral well bores to the surface well bore increases.
44. The subterranean drainage pattern of Claim 42, wherein the lateral well bores each substantially extend at an angle of between 40 and 50 degrees from the diagonal well bore.
45. The subterranean drainage pattern of Claim 42, wherein the lateral well bores each substantially extend at an angle of approximately 45 degrees from the diagonal well bore.
46. The subterranean drainage pattern of Claim 42, wherein the area comprises a substantially quadrilateral area, and wherein the first and second ends comprise distant corners of the substantially quadrilateral area.
47. The subterranean drainage pattern of Claim 42, wherein the area comprises a substantially square area, and wherein the first and second ends comprise distant corners of the square area.
48. The subterranean drainage pattern of Claim 42, wherein the substantially horizontal diagonal well bore and the first and second sets of lateral well bores provide substantially uniform coverage of the area.
49. The subterranean drainage pattern of Claim 42, wherein each of the lateral well bores of the first and second sets are disposed in a substantially uniform spaced apart relationship to each other.
50. A method for accessing a subterranean zone from the 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.
51. The method of Claim 50, further comprising:
forming an enlarged cavity in the first well bore proximate to the subterranean zone;
forming the second well bore to intersect the enlarged cavity; and forming the well bore pattern extending from the enlarged cavity.
52. The method of Claim 50, wherein forming the well bore pattern comprises:
forming a third well bore extending from the junction into the subterranean zone;
and forming a plurality of lateral well bores extending outwardly from opposite sides of the third well bore.
53. The method of Claim 52, wherein a length of each of the lateral well bores decreases as a distance between the corresponding lateral well bore and the junction increases.
54. The method of Claim 50, 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.
55. The method of Claim 50, wherein forming the well bore pattern comprises forming a pinnate well bore pattern.
56. The method of Claim 50, further comprising injecting a substance into the subterranean zone through the well bore pattern.
57. The method of Claim 50, further comprising removing a resource from the subterranean zone through the first well bore.
58. A system for accessing a subterranean zone from the surface, comprising:
a first well bore extending from the surface to the subterranean zone;
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 the subterranean zone;
and a well bore pattern extending from the junction into the subterranean zone.
59. The system of Claim 58, wherein the well bore pattern comprises a pinnate well bore pattern.
60. The system of Claim 58, wherein the well bore pattern comprises:
a third well bore extending from the junction into the subterranean zone; and a plurality of lateral well bores extending outwardly from opposite sides of the third well bore.
61. The system of Claim 60, wherein a length of each of the lateral well bores decreases as a distance from a respective lateral well bore to the junction increases.
62. The system of Claim 58, further comprising an enlarged cavity formed at the junction proximate the subterranean zone.
63. The system of Claim 58, wherein the well bore pattern comprises:
a third well bore extending from the junction;
a first set of lateral well bores extending outwardly from a first side of the third well bore; and a second set of lateral well bores extending outwardly from a second side of the third well bore.
64. The system of Claim 63, wherein each of the lateral well bores of the first and second sets are substantially evenly spaced from each other.
CA2436059A 2001-01-30 2002-01-18 Method and system for accessing subterranean zones from a limited surface area Expired - Fee Related CA2436059C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US09/773,217 US6425448B1 (en) 2001-01-30 2001-01-30 Method and system for accessing subterranean zones from a limited surface area
US09/773,217 2001-01-30
PCT/US2002/001320 WO2002061233A1 (en) 2001-01-30 2002-01-18 Method and system for accessing subterranean zones from a limited surface area

Publications (2)

Publication Number Publication Date
CA2436059A1 true CA2436059A1 (en) 2002-08-08
CA2436059C CA2436059C (en) 2010-06-29

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CA2436059A Expired - Fee Related CA2436059C (en) 2001-01-30 2002-01-18 Method and system for accessing subterranean zones from a limited surface area

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US (3) US6425448B1 (en)
CN (1) CN100473803C (en)
AU (2) AU2002251776B2 (en)
CA (1) CA2436059C (en)
MX (1) MXPA03006811A (en)
WO (1) WO2002061233A1 (en)
ZA (1) ZA200305818B (en)

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