System and method for extracting energy
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United States of America Patent
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Mar 31, 2015
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app pub date -
Nov 16, 2011
filing date -
Nov 16, 2010
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Abstract
A method and apparatus for extracting geothermal energy from a subterranean thermal reservoir through a wellbore where the heat exchange fluid is introduced at a slower velocity than the velocity at which the fluid is extracted. The method and apparatus further comprises a gas zone near the top of the wellbore to maintain the thermal energy of the heat exchange fluid. In one embodiment, a portion of the casing of the wellbore can directly contact the subterranean environment. Alternatively, a thermally conductive wall comprising a thermally conductive material can surround a portion of the casing of the wellbore. Further, the inner and/or outer surface of the pipes and conduits of the disclosed method and apparatus can include modified surface features that influence the flow and/or thermal conductivity of the heat exchange fluid.
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