Downhole heat exchanger for in-situ minefields

Details Downhole heat exchanger for in-situ minefields Downhole heat exchanger for in-situ minefields

E - Fixed Constructions

21

B

166/30

E21B 43/00 (2006.01) E21B 36/00 (2006.01) E21B 43/28 (2006.01)

Patent

CA 1071532

K-0490-KCC ABSTRACT OF THE DISCLOSURE A circulation tubing string is disposed about the lixiviant return tubing string in the production hole of an in-situ minefield. The circulation string extends from the surface to a point near a packer which defines the top of the leaching interval. A fluid coupler pro- vides a fluid flow path between the annular cross- section regions between the production hole casing and the circulation string, and between the circulation string and the lixiviant return string. A flow of cool- ing fluid is maintained from the surface through the circuital path defined by the annular cross-section regions and the fluid coupler, particularly including the exterior surface of the production tubing string. The fluid is maintained at a temperature and flow rate such that the pregnant leach liquor flows in the pro- duction tubing string between the leaching interval and the surface at a predetermined reduced temperature.

287317

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