Aqueous acid gels and use thereof

Details Aqueous acid gels and use thereof Aqueous acid gels and use thereof

E - Fixed Constructions

21

B

31/23

E21B 43/27 (2006.01) C09K 8/68 (2006.01) C09K 8/72 (2006.01)

Patent

CA 1246852

ABSTRACT OF THE DISCLOSURE Copolymers of a predominant proportion of an olefinically unsaturated sulfonic acid, an acrylamide, a vinyl phosphonic acid, and optionally other copoly- merizable vinyl monomers, form aqueous acid gel composi- tions when added to the aqueous acid along with a gel- ling agent selected from titanium or zirconium compounds, and retarded gel destabilizing compounds containing fluoride, sulphate or phosphate anions, the apparent viscosity and time of stability of the acid gel composi- I tion being controlled by the addition of these essential ingredients.

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