Selectively plugging the more permeable strata of a subterranean

Details Selectively plugging the more permeable strata of a subterranean Selectively plugging the more permeable strata of a subterranean

1976-03-17

1977-01-25

Purser, Ernest R.

Wells

Processes

Cementing, plugging or consolidating

166270, E21B 33138, E21B 4322

Patent

active

040046397

ABSTRACT:
A method for plugging the more permeable strata of a subterranean formation of nonuniform permeability in which an aqueous solution of a gelling agent and an aqueous solution containing both a gelling agent and an alkali metal silicate are injected into the formation. The two solutions can be injected in any order, and are separated by a slug of an inert aqueous spacer liquid. The first injected solution preferably also contains a polymer thickener.

REFERENCES:
patent: 2807324 (1957-09-01), King et al.
patent: 3342262 (1967-09-01), King et al.
patent: 3386509 (1968-06-01), Froning
patent: 3396790 (1968-08-01), Eaton
patent: 3530937 (1970-09-01), Bernard
patent: 3741307 (1973-06-01), Sandiford et al.
patent: 3871452 (1975-03-01), Sarem
patent: 3871453 (1975-03-01), Sarem
patent: 3882938 (1975-05-01), Bernard

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