Method for restricting gas influx during well cementing

Details Method for restricting gas influx during well cementing Method for restricting gas influx during well cementing

1990-10-03

1991-05-07

Neuder, William P.

Wells

Processes

Cementing, plugging or consolidating

166292, E21B 3314

Patent

active

050128698

ABSTRACT:
A method of forming a flow-restricting layer on a wellbore surface prior to cementing a casing string in the wellbore. The flow-restricting layer is formed by reaction of an injected fluid with divalent ions at and near the wellbore surface. The injected fluid is a composition containing a water-soluble polymer and one or more potassium salts.

REFERENCES:
patent: 4428424 (1984-01-01), Lacy et al.
patent: 4600056 (1986-07-01), Burton, Jr.
patent: 4951921 (1990-08-01), Stahl et al.

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