Three-dimensional well system for accessing subterranean zones
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
E21B-043/30
E21B-043/00
출원번호
US-0244083
(2002-09-12)
발명자
/ 주소
Zupanick,Joseph A.
출원인 / 주소
CDX Gas, LLC
대리인 / 주소
Fish &
인용정보
피인용 횟수 :
29인용 특허 :
225
초록▼
A drainage system for accessing multiple subterranean zones from the surface includes an entry well extending from the surface. The system also includes two or more exterior drainage wells extending from the entry well through the subterranean zones. The exterior drainage wells each extend outwardly
A drainage system for accessing multiple subterranean zones from the surface includes an entry well extending from the surface. The system also includes two or more exterior drainage wells extending from the entry well through the subterranean zones. The exterior drainage wells each extend outwardly and downwardly from the entry well for a first selected distance and then extend downwardly in a substantially vertical orientation for a second selected distance.
대표청구항▼
What is claimed is: 1. A method for accessing a plurality of subterranean zones from the surface, comprising: forming an entry well from the surface; forming a central drainage well extending downwardly from the entry well in a substantially vertical orientation through the subterranean zones; fo
What is claimed is: 1. A method for accessing a plurality of subterranean zones from the surface, comprising: forming an entry well from the surface; forming a central drainage well extending downwardly from the entry well in a substantially vertical orientation through the subterranean zones; forming an enlarged cavity from the central drainage well and proximate a bottom of the central drainage well; and forming two or more exterior drainage wells from the entry well through the subterranean zones, wherein each exterior drainage well: extends outwardly and downwardly from the entry well for a first selected distance; extends downwardly in a substantially vertical orientation for a second selected distance; and extends inwardly towards the central drainage well for a third selected distance and intersects the enlarged cavity. 2. The method of claim 1, further comprising forming an enlarged cavity from one or more of the exterior drainage wells proximate the intersection of the one or more exterior drainage wells and one or more of the subterranean zones. 3. The method of claim 1, wherein the central drainage well comprises a larger diameter than the exterior drainage wells. 4. The method of claim 1, further comprising: positioning a pump inlet in the enlarged cavity; and pumping fluids produced from one or more of the subterranean zones from the enlarged cavity to the surface. 5. The method of claim 1, further comprising forming a plurality of drainage systems each comprising an entry well and two or more associated exterior drainage wells, the drainage systems located in proximity to one another such that they nest adjacent one another. 6. The method of claim 5, wherein each drainage system comprises six exterior drainage wells and covers a substantially hexagonal area and wherein the drainage systems nest together in a honeycomb pattern. 7. The method of claim 1, wherein the plurality of subterranean zones comprise coal seams. 8. The method of claim 1, further comprising: positioning a pump inlet proximate a bottom of one or more of the drainage wells; and pumping fluids produced from one or more of the subterranean zones from the pump inlet to the surface. 9. The method of claim 1, further comprising injecting fluids into one or more of the subterranean zones from the surface using the drainage wells. 10. The method of claim 1, further comprising: inserting a guide tube bundle into the entry well, the guide tube bundle comprising two or more twisted guide tubes; and forming the exterior drainage wells from the entry well using the guide tubes. 11. The method of claim 1, wherein the two or more exterior drainage wells are formed from the entry well using a whipstock. 12. A drainage system for accessing a plurality of subterranean zones from the surface, comprising: an entry well extending from the surface; a central drainage well extending downwardly from the entry well in a substantially vertical orientation through the subterranean zones; an enlarged cavity formed from the central drainage well proximate a bottom of the central drainage well; and two or more exterior drainage wells extending from the entry well through the subterranean zones, wherein each exterior drainage well; extends outwardly and downwardly from the entry well for a first selected distance; extends downwardly in a substantially vertical orientation for a second selected distance; and extends inwardly towards the central drainage well for a third selected distance and intersects the enlarged cavity. 13. The system of claim 12, further comprising an enlarged cavity formed from one or more of the exterior drainage wells proximate the intersection of the one or more exterior drainage wells and one or more of the subterranean zones. 14. The system of claim 12, wherein the central drainage well comprises a larger diameter than the exterior drainage wells. 15. The system of claim 12, further comprising a pump configured to pump fluids produced from one or more of the subterranean zones from the enlarged cavity to the surface. 16. The system of claim 12, further comprising a plurality of drainage systems each comprising an entry well and two or more associated exterior drainage wells, the drainage systems located in proximity to one another such that they nest adjacent one another. 17. The system of claim 16, wherein each drainage system comprises six exterior drainage wells and covers a substantially hexagonal area, and wherein the drainage systems nest together in a honeycomb pattern. 18. The system of claim 12, wherein the plurality of subterranean zones comprise coal seams. 19. The system of claim 12, further comprising a pump configured to pump fluids produced from one or more of the subterranean zones from a bottom of one or more of the exterior drainage wells to the surface. 20. The system of claim 12, further comprising a guide tube bundle positioned in the entry well, the guide tube bundle comprising two or more twisted guide tubes, and wherein the exterior drainage wells are formed from the entry well using the guide tubes. 21. A drainage system for accessing one or more subterranean zones from the surface, comprising: a central drainage well extending from the surface to at least one subterranean zone; and two or more exterior drainage wells extending from the surface and through the at least one subterranean zone, the exterior drainage wells each extending outwardly away from the central drainage well and downwardly; the two or more exterior drainage wells further extending inwardly towards the central drainage well and intersecting the central drainage well proximate to or below the at least one subterranean zone; and whereby fluids drain from the at least one subterranean zone through the two or more exterior drainage wells to the central drainage well for production to the surface. 22. The system of claim 21, wherein the two or more exterior drainage wells extend from the surface through the central drainage well. 23. The system of claim 21, wherein the central drainage well and the two or ore exterior drainage wells extend from a single surface location. 24. The system of claim 21, wherein the two or more exterior drainage wells extend from the central drainage well at an angle. 25. The system of claim 21, wherein the two or more exterior drainage wells are substantially uniformly spaced from the central drainage well. 26. The system of claim 21, wherein the two or more exterior drainage wells intersect multiple subterranean zones, each of the two or more exterior drainage wells capable of draining fluids from the multiple subterranean zones. 27. The system of claim 21, comprising an enlarged cavity formed from one or more of the exterior drainage wells proximate one or more of the subterranean zones. 28. The system of claim 21, wherein the central drainage well comprises an entry well. 29. The system of claim 21, wherein the central drainage well comprises a substantially vertical central drainage well. 30. The system of claim 21, wherein each exterior drainage well extends substantially vertically downward for a distance. 31. The system of claim 21, comprising three or more exterior drainage wells. 32. The system of claim 21, comprising four or more exterior drainage wells. 33. The system of claim 21, comprising six or more exterior drainage wells. 34. A method for accessing one or more subterranean zones from the surface, comprising: forming a central drainage well from the surface to at least one subterranean zone; forming two or more exterior drainage wells from the surface and extending through the at least one subterranean zone, the exterior drainage wells each extending outwardly away from the central drainage well and downwardly, the two or more exterior drainage wells further extending inwardly towards the central drainage well and intersecting the central drainage well proximate to or below the at least one subterranean zone; and draining fluids from the at least one subterranean zone through the two or more exterior drainage wells to the central drainage well for production to the surface. 35. The method of claim 34, further comprising forming the two or more exterior drainage wells from the surface through the central drainage well. 36. The method of claim 34, comprising forming the central drainage well and the two or more exterior drainage wells from a single surface location. 37. The method of claim 34, further comprising forming, at an angle, the two or more exterior drainage wells from the central drainage well. 38. The method of claim 34, comprising forming the two or more exterior drainage wells such that they are substantially uniformly spaced from the central drainage well. 39. The method of claim 34, further comprising forming the two or more exterior drainage wells to intersect multiple subterranean zones, each of the two or more exterior drainage wells capable of draining fluids from the multiple subterranean zones. 40. The method of claim 34, further comprising forming a enlarged cavity from one or more of the exterior drainage wells proximate one or more of the subterranean zones. 41. The method of claim 34, wherein forming the central drainage well comprises forming an entry well. 42. The method of claim 34, wherein forming the central drainage well comprises forming a substantially vertical central drainage well. 43. The method of claim 34, further comprising forming each exterior drainage well substantially vertically downward for a distance. 44. The method of claim 34, comprising forming three or more exterior drainage wells. 45. The method of claim 34, comprising forming four or more exterior drainage wells. 46. The method of claim 34, comprising forming six or more exterior drainage wells.
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