Method for altering flow profile of a subterranean formation dur

Details Method for altering flow profile of a subterranean formation dur Method for altering flow profile of a subterranean formation dur

1994-12-15

1996-06-25

Suchfield, George A.

Wells

Processes

Separate steps of fracturing or attacking formation

166307, 166309, 507202, 507205, 507211, 507261, E21B 4327

Patent

active

055291228

ABSTRACT:
A method for acidizing a subterranean formation wherein a specific foam is used to block flow through the higher-permeable zones of the formation while the acid is being injected therein. The foam is generated from a surfactant solution comprised of a blend of surfactants comprised of a nonionic primary surfactant (e.g. ethoxylated alcohol or polyglycosides) a cationic co-surfactant (e.g. fluorinated quaternary ammonium chloride). A polymer (e.g. polysaccharides or partially hydrolyzed polyacrylamide) may be added to the surfactant solution to enhance the foam mobility reduction and a co-solvent (e.g. polyol) may be added if necessary to maintain the surfactant/polymer complex in solution.

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"Applying Fractional-Flow Theory to Foams for Diversion in Matrix Acidization" Z. H. Zhou et al; SPE 24660; Washington, DC Oct. 4-7, 1992.

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