Thermal processes for subsurface formations
First Claim
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1. A system configured to insulate an overburden of at least a part of a hydrocarbon containing formation, comprising:
- an opening in a part of the formation;
a freeze well located in the opening, wherein a refrigerant is circulated through the freeze well to freeze at least a portion of the formation below the overburden, the freeze well comprising;
a first conduit;
an insulating material located between the first conduit and the overburden;
a second conduit located inside the first conduit with an annular region between the first and second conduits, wherein the refrigerant enters the freeze well through the second conduit and exits the freeze well through the annular region; and
one or more spacers in the annular region, wherein the spacers position the second conduit in the first conduit, and wherein the spacers promote turbulent flow of the refrigerant in the annular region.
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Abstract
A process may include providing heat from one or more heaters to at least a portion of a subsurface formation. Heat may transfer from one or more heaters to a part of a formation. Heat from the one or more heat sources may pyrolyze at least some hydrocarbons in a part of a subsurface formation. Hydrocarbons and/or other products may be produced from a subsurface formation. Apparatus, methods, and/or processes used in treating a subsurface or hydrocarbon containing formation are described.
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Citations
22 Claims
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1. A system configured to insulate an overburden of at least a part of a hydrocarbon containing formation, comprising:
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an opening in a part of the formation; a freeze well located in the opening, wherein a refrigerant is circulated through the freeze well to freeze at least a portion of the formation below the overburden, the freeze well comprising; a first conduit; an insulating material located between the first conduit and the overburden; a second conduit located inside the first conduit with an annular region between the first and second conduits, wherein the refrigerant enters the freeze well through the second conduit and exits the freeze well through the annular region; and one or more spacers in the annular region, wherein the spacers position the second conduit in the first conduit, and wherein the spacers promote turbulent flow of the refrigerant in the annular region. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method whereby heat transfer between an overburden of at least a part of a hydrocarbon containing formation and a freeze well positioned in an opening in a part of the formation is decreased, comprising:
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locating an insulating material between a first conduit and the overburden; locating a second conduit inside the first conduit and forming an annular region between the first and second conduits, wherein a refrigerant enters the freeze well through the second conduit and exits the freeze well through the annular region; positioning one or more spacers in the annular region, wherein the spacers position the second conduit in the first conduit, and wherein the spacers promote turbulent flow of the refrigerant in the annular region; and circulating the refrigerant through the freeze well to freeze at least a portion of the formation below the overburden. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22)
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Specification