Fracturing fluid
First Claim
1. A process for fracturing a subterranean formation penetrated by at least one injection well wherein an aqueous fracturing fluid comprised of a high molecular weight polyacrylamide polymer is injected into the formation, the steps comprising injecting into the formation at sufficient rate and pressure to fracture the formation an aqueous solution of a high molecular weight polyacrylamide polymer that is gelled in the presence of chromic ion prior to injection of the polymer into the formation.
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Accused Products
Abstract
Improved fracturing of subterranean formations with water-based fracturing fluids is obtained by incorporating into an aqueous fracturing fluid (1) a water-soluble, high molecular weight polymer that will crosslink in the presence of chromic ion and (2) controlled amounts of chromic ion to crosslink the polymer to form a gel of desired viscosity. Useful polymers include partially hydrolyzed polyacrylamide and copolymers of acrylamide and sodium acrylate.
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Citations
18 Claims
- 1. A process for fracturing a subterranean formation penetrated by at least one injection well wherein an aqueous fracturing fluid comprised of a high molecular weight polyacrylamide polymer is injected into the formation, the steps comprising injecting into the formation at sufficient rate and pressure to fracture the formation an aqueous solution of a high molecular weight polyacrylamide polymer that is gelled in the presence of chromic ion prior to injection of the polymer into the formation.
- 10. A process of fracturing a subterranean formation penetrated by at least one injection well wherein an aqueous fracturing fluid comprised of a water soluble, high molecular weight polyacrylamide polymer is injected into the formation, the steps comprising injecting into the formation at sufficient rate and pressure to fracture the formation an aqueous solution comprised of about 0.1 to about 3.0 percent by weight of a polyacrylamide polymer that has been gelled in the presence of about 0.01 to about 1 percent by weight of chromic ion.
Specification