Anhydrous foam with gas for acidizing high temperatures...

Details Anhydrous foam with gas for acidizing high temperatures... Anhydrous foam with gas for acidizing high temperatures...

E - Fixed Constructions

21

B

31/14

E21B 43/27 (2006.01) E21B 43/26 (2006.01)

Patent

CA 1140326

"Abstract of the Disclosure" Subterranean formations having temperatures above about 250° F. are acidized by introducing a substantially anhy- drous foamed treating fluid through a well and into the for- mation. The treating fluid contains a gas, a nonionic substan- tially hydrophohic foaming agent and an acid precursor which is normally liquid halogenated hydrocarbon having one or two car- bon atoms per molecule. The acid precursor hydrolyzes in situ to generate a hydrohalic acid.

370422

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