Methods for acidizing subterranean formations and gelled...

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

E - Fixed Constructions

21

B

31/21

E21B 43/27 (2006.01)

Patent

CA 1220930

ABSTRACT OF THE DISCLOSURE Gelable and gelled acid compositions comprise an aqueous acid, a water soluble polymer comprising, for example, acrylamide, an N-sulfoalkyl ethylenically unsaturated amide and a polyvinyl crosslinking monomer, and a reducing agent such as erythorbic acid. The gelled acids are useful in acidizing subterranean formations and do not yield insoluble residues when used in the presence of ferric ions.

461843

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