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US 6,844,297 B2Granted
Fracturing method using aqueous or acid based fluids
AssigneesCalfrac Well Services Ltd., Chemergy Ltd.
InventorsTravis L. Allan, Junad Amin, Alan K. Olson, Ronald G. Pierce
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Abstract
An improved method and fracturing fluid for hydraulic fracturing of a subterranean formation, the fracturing fluid comprising a surfactant, a water soluble or dispersible anionic organic salt, an acid and a low molecular weight organic solvent.
Claims10
A method of fracturing a subterranean formation comprising the steps of:
- providing a visco-elastic surfactant based hydraulic fracturing fluid comprising:
- (i) a surfactant having the general formula
- wherein R1-R2 are each an aliphatic group of C1-C4, branched or straight chained, saturated or unsaturated, R3 is a group of C12-C22, branched, straight chained or cyclic, saturated or unsaturated;
- (ii) a water soluble or dispersible anionic organic or inorganic salt;
- (iii) an acid;
- and
- (iv) a low molecular weight organic solvent, and;
- pumping said fracturing fluid through a well bore and into a subterranean formation at a sufficient pressure to cause fracturing of said formation including the further step of lowering the viscosity of said fluid by raising the pH thereof.
5 more elements
Dependencies are inferred from the claim text.