Chemical process for backsurging fluid through well casing...

Details Chemical process for backsurging fluid through well casing... Chemical process for backsurging fluid through well casing...

E - Fixed Constructions

21

B

166/25

E21B 43/27 (2006.01) C09K 8/60 (2006.01) E21B 37/00 (2006.01)

Patent

CA 1136984

ABSTRACT A CHEMICAL PROCESS FOR BACKSURGING FLUID THROUGH WELL CASING PERFORATIONS A backsurge of fluid through perforations in a well casing is chemically induced by injecting into the surrounding reservoir a solution which contains (a) nitrogen gas- generating reactants, (b) a reaction-retarding alkaline buffer, and (c) a pH-reducing reactant that is capable of subsequently overriding the buffer. The reaction rates and the fluid injection rate are correlated such that the rapid production of gas is not initiated until the solution is in the reservoir.

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