Process for cleaning a subterranean injection surface and for se

Details Process for cleaning a subterranean injection surface and for se Process for cleaning a subterranean injection surface and for se

1981-01-02

1982-08-10

Novosad, Stephen J.

Wells

Processes

Separate steps of fracturing or attacking formation

166288, 166295, 166300, E21B 33138, E21B 4322

Patent

active

043433634

ABSTRACT:
A process for selectively reducing the permeability of a subterranean formation penetrated by a well bore and having an injection surface plugged by crosslinked dry polymer. The process comprises the sequential injection of an aqueous solution containing an oxidizing agent, an aqueous spacer medium, and an aqueous solution having at least one dry polymer dissolved therein. Sequential injection of these aqueous solutions can be repeated to achieve the desired degree of injectivity and permeability reduction.

REFERENCES:
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patent: 3785437 (1974-01-01), Clampitt et al.
patent: 3958638 (1976-05-01), Johnston
patent: 4039029 (1977-08-01), Gall
patent: 4120361 (1978-10-01), Threlkeld

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