Formation fracturing

Details Formation fracturing Formation fracturing

1994-05-18

1995-10-24

Suchfield, George A.

Wells

Processes

Chemical inter-reaction of two or more introduced materials

166308, 507211, 507267, 507273, 507903, 507921, 507922, E21B 4326

Patent

active

054602262

ABSTRACT:
A method is provided to fracture a subterranean formation along with a fracturing fluid useful in this method, the method comprising the steps of: a) providing a fracturing fluid, the fracturing fluid is an aqueous solution having an initial pH greater than about 8 and comprising a polysaccharide, a source of borate in an amount that is effective to crosslink the polysaccharide at a pH greater than 8, an oxidative breaker, and a precursor that hydrolyzes in an amount that is effective to lower the pH of the fracturing fluid after a time period that is greater than about one half hour and less than about two days; b) injecting the fracturing fluid into the formation at a pressure the is effective to fracture the formation and force at least a portion of the fracturing fluid into the fracture; and c) permitting the precursor to hydrolyze and thereby lowering the pH of the fracturing fluid to a pH that is less than about 8.

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patent: 5271466 (1993-12-01), Harms

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