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Kafe 바로가기국가/구분 | United States(US) Patent 등록 |
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국제특허분류(IPC7판) |
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출원번호 | UP-0584799 (2006-10-20) |
등록번호 | US-7549470 (2009-07-01) |
발명자 / 주소 |
|
출원인 / 주소 |
|
인용정보 | 피인용 횟수 : 195 인용 특허 : 604 |
A method for treating an oil shale formation comprising nahcolite includes providing a first fluid to a portion of the formation. A second fluid is produced from the portion. The second fluid includes at least some nahcolite dissolved in the first fluid. A controlled amount of oxidant is provided t
A method for treating an oil shale formation comprising nahcolite includes providing a first fluid to a portion of the formation. A second fluid is produced from the portion. The second fluid includes at least some nahcolite dissolved in the first fluid. A controlled amount of oxidant is provided to the portion of the formation. Hydrocarbon fluids are produced from the formation.
What is claimed is: 1. A method for treating an oil shale formation comprising nahcolite, the method comprising: providing a first fluid to a portion of the formation; producing a second fluid from the portion, wherein the second fluid includes at least some nahcolite dissolved in the first fluid;
What is claimed is: 1. A method for treating an oil shale formation comprising nahcolite, the method comprising: providing a first fluid to a portion of the formation; producing a second fluid from the portion, wherein the second fluid includes at least some nahcolite dissolved in the first fluid; creating interconnectivity between two or more wellbores in the portion of the formation; providing heat to at least a part of the portion of the formation from one or more heaters located in the formation; providing a controlled amount of oxidant to the portion of the formation such that the oxidant flows between at least two of the interconnected wellbores; and producing hydrocarbon fluids from the formation. 2. The method of claim 1, wherein the first fluid is hot water. 3. The method of claim 1, wherein the first fluid is steam. 4. The method of claim 1, wherein the first fluid is hot water with a temperature below about 250° C. 5. The method of claim 1, wherein the first fluid is hot water or steam pressurized to a pressure below the fracture pressure of the formation. 6. The method of claim 1, wherein the second fluid also includes carbon dioxide produced from decomposition of a portion of the nahcolite. 7. The method of claim 1, wherein producing nahcolite from the formation creates a permeable zone; and providing the oxidant to the permeable zone. 8. The method of claim 1, further comprising burning at least a portion of hydrocarbons in the formation with the oxidant, wherein burning of the hydrocarbons provides heat to at least a portion of the formation. 9. The method of claim 1, further comprising heating the first fluid before providing the first fluid to the formation. 10. The method of claim 1, further comprising providing the first fluid through one or more injection wells. 11. The method of claim 1, further comprising providing the heat from the heaters prior to providing the oxidant to the portion of the formation. 12. The method of claim 1, further comprising providing heat from at least one of the heaters to a wellbore region to facilitate oxidation, and wherein heat from such oxidation heats at least a portion of the formation. 13. The method of claim 1, further comprising providing the oxidant through one or more injection wells. 14. The method of claim 1, further comprising: decomposing at least some dawsonite in the formation with heat; providing a chelating agent to the formation to dissolve at least some dawsonite decomposition products; and producing the dissolved dawsonite decomposition products. 15. The method of claim 1, further comprising: decomposing at least some dawsonite in the formation with heat; providing a relatively basic fluid to the formation to dissolve at least some dawsonite decomposition products; and producing the dissolved dawsonite decomposition products. 16. The method of claim 1, wherein controlling the amount of oxidant provided controls heating of the formation. 17. A method for treating an oil shale formation comprising nahcolite, the method comprising: forming and maintaining a low temperature zone around at least a portion of a subsurface treatment area; providing a first fluid to a portion of the subsurface treatment area; producing a second fluid from the portion, wherein the second fluid includes at least some nahcolite dissolved in the first fluid; creating interconnectivity between two or more wellbores in the portion of the subsurface treatment area; providing heat to at least a part of the portion of the subsurface treatment area from one or more heaters located in the subsurface treatment area; providing a controlled amount of oxidant to the portion of the subsurface treatment area such that the oxidant flows between at least two of the interconnected wellbores; and producing hydrocarbon fluids from the subsurface treatment area. 18. The method of claim 17, wherein forming and maintaining the low temperature zone comprises: reducing a temperature of heat transfer fluid with a refrigeration system; circulating the heat transfer fluid through fleeze wells located in a subsurface formation around at least a portion of the subsurface treatment area; and returning the heat transfer fluid to the refrigeration system. 19. The method of claim 17, wherein controlling the amount of oxidant provided controls heating of the formation. 20. A method for treating an oil shale formation comprising nahcolite, the method comprising: forming a barrier around at least a portion of a subsurface treatment area, the barrier configured to inhibit fluid from exiting or entering the subsurface treatment area; providing a first fluid to a portion of the subsurface treatment area; producing a second fluid from the portion, wherein the second fluid includes at least some nahcolite dissolved in the first fluid; creating interconnectivity between two or more wellbores in the portion of the subsurface treatment area; providing heat to at least a part of the poition of the subsurface treatment area from one or more heaters located in the subsurface treatment area; providing a controlled amount of oxidant to the portion of the subsurface treatment area such that the oxidant flows between at least two of the interconnected wellbores; and producing hydrocarbon fluids from the subsurface treatment area. 21. The method of claim 20, wherein the barrier is a freeze barrier established by freeze wells. 22. The method of claim 20, wherein the barrier is a sulfur barrier. 23. The method of claim 20, wherein the barrier is a wax barrier. 24. The method of claim 20, wherein controlling the amount of oxidant provided controls heating of the formation.
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