Low temperature barriers for use with in situ processes
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United States of America Patent
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Jun 16, 2009
Grant Date -
Jun 28, 2007
app pub date -
Apr 21, 2006
filing date -
Apr 22, 2005
priority date (Note) -
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Abstract
A method of forming and maintaining a low temperature zone around at least a portion of a subsurface treatment area is described. The method includes reducing a temperature of heat transfer fluid with a refrigeration system. The heat transfer fluid is circulated through freeze well canisters and placed in a formation around at least a portion of the subsurface treatment area. An initial temperature of the heat transfer fluid supplied to a first freeze well canister is in a range from about −35 ° C. to about −55 ° C. At least one of the well canisters includes carbon steel. The heat transfer fluid is returned to the refrigeration system.
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