Methods for acidizing subterranean formations and gelled...

Details Methods for acidizing subterranean formations and gelled... Methods for acidizing subterranean formations and gelled...

C - Chemistry, Metallurgy

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C08L 33/26 (2006.01) C08J 3/075 (2006.01) C08K 3/16 (2006.01) C08K 5/07 (2006.01) C08K 5/17 (2006.01) C09K 8/74 (2006.01) E21B 33/138 (2006.01) E21B 43/22 (2006.01)

Patent

CA 1217324

Abstract of the Disclosure Gellable (and gelled) acid compositions are disclosed which comprise: an aqueous acid, aldehyde- crosslinkable polymeric viscosifiers, an aldehyde- releasing compound, and a reducing agent or chelating agent. The gelled acids are useful in acidizing subter- ranean formations. As an example, 28 percent hydro- chloric acid was gelled with a 70:30 AMPS/acrylamide copolymer crosslinked with hexamethylenetetraamine in the presence of erythorbic acid.

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