Patent ID: 7166560
Filing Date: 2007-01-23
Classification: C09K,Y10S

Abstract:
1. A method of acid fracturing a subterranean formation penetrated by a wellbore comprising: a) injecting into the formation a fluid comprising particles of a solid acid-precursor at a concentration between about 0.05 and about 0.6 kg/L, at a pressure sufficient to fracture the formation, said fluid not viscosified with a viscoelastic surfactant, and b) allowing at least a portion of the solid acid-precursor to hydrolyze, wherein the solid acid-precursor is mixed with a solid acid-reactive material selected from the group consisting of magnesium hydroxide, magnesium carbonate, magnesium calcium carbonate, calcium carbonate, aluminum hydroxide, calcium oxalate, calcium phosphate, aluminum metaphosphate, sodium zinc potassium polyphosphate glass, and sodium calcium magnesium polyphosphate glass.