Wells – Processes – Specific pattern of plural wells
Reexamination Certificate
2006-04-21
2009-06-16
Suchfield, George (Department: 3676)
Wells
Processes
Specific pattern of plural wells
C062S045100, C062S260000, C166S052000, C166S057000, C166S075110, C166S075120, C166S242100, C166S285000, C166S302000, C405S130000
Reexamination Certificate
active
07546873
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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Kim Dong Sub
Vinegar Harold J.
Shell Oil Company
Suchfield George
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