Method for treating subterranean formations

Details Method for treating subterranean formations Method for treating subterranean formations

1989-01-17

1990-04-24

Suchfield, George A.

Wells

Processes

Chemical inter-reaction of two or more introduced materials

166308, 252 8551, E21B 4326

Patent

active

049192094

ABSTRACT:
A method for breaking the fracturing fluid comprises injecting into the subterranean formation a controlled release breaker capsule including an enclosure material enveloping a breaker. The enclosure material is sufficiently permeable to at least one fluid existing in the subterranean environment or injected with the controlled release capsule such that the breaker capsule is capable of dissolving or eroding upon sufficient exposure to the fluid, thereby releasing the breaker.
Using the method of the present invention, breaking of fracturing fluids is significantly improved when the temperature in the subterranean environment is from about 20.degree. C. to about 65.degree. C.

REFERENCES:
patent: 3990978 (1976-11-01), Hill
patent: 4506734 (1985-03-01), Nolte
patent: 4560486 (1985-12-01), Hinkel
patent: 4741401 (1988-05-01), Walles et al.
patent: 4795574 (1989-01-01), Syrinek et al.

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