Wells – Processes – Chemical inter-reaction of two or more introduced materials
Patent
1987-12-22
1989-07-18
Suchfield, George A.
Wells
Processes
Chemical inter-reaction of two or more introduced materials
166250, 166308, E21B 4326, E21B 4900
Patent
active
048484687
ABSTRACT:
A method for extending a vertical fracture formed in a formation having original in-situ stresses that favor the propagation of a horizontal fracture. In this method, a subsurface formation having original in-situ stresses that favor the propagation of a horizontal fracture is penetrated by a cased borehole which is perforated at a pair of spaced-apart intervals to form separate pairs of perforations. Fracturing fluid is initially pumped down said cased borehole and out one of said sets of perforations to form the originally favored horizontal fracture. The propagation of this horizontal fracture changes the in-situ stresses so as to favor the propagation of a vertical fracture. Said horizontal fracture is extended by placing a chemical blowing agent and surfactant into the fracturing fluid. Gas released by decomposition of said agent causes foam to be generated along with an increase in pressure thereby extending the horizontal fracture. Thereafter, while maintaining pressure on said horizontal fracture, fracturing fluid is pumped down said cased borehole and out of the other of said sets of perforations to form the newly favored vertical fracture.
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Hazlett Randy D.
Uhri Duane C.
Malone Charles A.
McKillop Alexander J.
Mobil Oil Corp.
Speciale Charles J.
Suchfield George A.
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