ExxonMobil Upstream Research Company-Law Department
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2인용 특허 :
241
초록▼
A method of lowering the temperature of a subsurface formation, e.g., comprising oil shale, includes injecting a cooling fluid under pressure into a wellbore. The wellbore is completed at or below a depth of the subsurface formation, and the wellbore includes a bore formed through the subsurface for
A method of lowering the temperature of a subsurface formation, e.g., comprising oil shale, includes injecting a cooling fluid under pressure into a wellbore. The wellbore is completed at or below a depth of the subsurface formation, and the wellbore includes a bore formed through the subsurface formation defining a diameter. The cooling fluid comprises a slurry having particles of frozen material. The cooling fluid is circulated across the formation in order to lower the temperature of at least a portion of the formation to a point that is at or below the freezing point of water.
대표청구항▼
1. A method of lowering the temperature of a subsurface formation, comprising: (a) injecting a cooling fluid under pressure into a wellbore, the wellbore being completed at or below a depth of the subsurface formation, and the wellbore having a bore formed through the subsurface formation defining a
1. A method of lowering the temperature of a subsurface formation, comprising: (a) injecting a cooling fluid under pressure into a wellbore, the wellbore being completed at or below a depth of the subsurface formation, and the wellbore having a bore formed through the subsurface formation defining a diameter, wherein the cooling fluid comprises a slurry having particles of frozen material,wherein the wellbore comprises an elongated tubular member, the elongated tubular member comprising a U-tube comprising a downward portion through which the cooling fluid flows to the subsurface formation, an upward portion through which the cooling fluid flows back to the surface, and the downward portion is insulated above the subsurface formation; and(b) circulating the cooling fluid across the formation in order to lower the temperature of at least a portion of the formation to a point that is at or below the freezing point of water. 2. The method of claim 1, wherein the cooling fluid defines a partially frozen alcohol-water mixture, a partially frozen glycol water mixture, a salt water mixture, or combinations thereof. 3. The method of claim 1, wherein the particles are less than 50 microns in size. 4. The method of claim 1, wherein the cooling fluid is chilled below ambient air temperature prior to injection into the wellbore. 5. The method of claim 1, wherein the subsurface formation comprises in situ water, and the cooling fluid cools the subsurface formation sufficient to freeze at least a portion of the in situ water. 6. A method of lowering the temperature of a subsurface formation, comprising: (a) injecting a cooling fluid under pressure into a wellbore, the wellbore being completed at or below a depth of the subsurface formation, and the wellbore having a bore formed through the subsurface formation defining a diameter, wherein the cooling fluid comprises a slurry having particles of frozen material;(b) circulating the cooling fluid across the formation via at least one fracture extending from the wellbore in order to lower the temperature of at least a portion of the formation to a point that is at or below the freezing point of water, and(c) injecting low salinity water into at least a portion of the subsurface formation to reduce the natural salinity of the in situ water and to raise the freezing temperature of the in situ water. 7. The method of claim 6, wherein the cooling fluid defines a partially frozen alcohol-water mixture, a partially frozen glycol water mixture, a salt water mixture, or combinations thereof. 8. The method of claim 6, wherein the particles are less than 50 microns in size. 9. The method of claim 6, wherein the cooling fluid is chilled below ambient air temperature prior to injection into the wellbore. 10. The method of claim 6, wherein the subsurface formation comprises in situ water, and the cooling fluid cools the subsurface formation sufficient to freeze at least a portion of the in situ water. 11. The method of claim 6, wherein: injecting a cooling fluid creates a downward flow of fluid into the wellbore, and an upward flow of fluid out of the wellbore; anda heat transfer coefficient between the upward and downward flows is less than 50 W/m2·C. 12. The method of claim 11, wherein the heat transfer coefficient between the upward and downward flows is less than 25 W/m2·C. 13. The method of claim 6, wherein circulating the cooling fluid across the formation via said at least one fracture extending from the wellbore further comprises circulating the cooling fluid from the wellbore through said at least one fracture and into an adjacent wellbore in order to lower the temperature of at least a portion of the formation to a point that is at or below the freezing point of water. 14. The method of claim 13, wherein at least one of said wellbores is completed substantially horizontally. 15. The method of claim 13, wherein at least one of said wellbores is completed substantially vertically or in a deviated manner.
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이 특허에 인용된 특허 (241)
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