Method for plugging subterranean formations with siliceous gels

Details Method for plugging subterranean formations with siliceous gels Method for plugging subterranean formations with siliceous gels

1989-06-26

1990-02-20

Suchfield, George A.

Wells

Processes

Cementing, plugging or consolidating

166300, E21B 33138

Patent

active

049017977

ABSTRACT:
A high pH solution containing a silica material and an inorganic fluoride salt which hydrolyzes to form hydrofluoric acid are introduced into a subterranean zone where the pH is reduced by the acid whereby the silica material forms a gel and plugs the subterranean zone. The pH at which gelling occurs can be increased by adding a soluble inorganic salt to the solution.

REFERENCES:
patent: 2693857 (1954-11-01), Marshall
patent: 3375872 (1968-04-01), McLaughlin et al.
patent: 3464494 (1969-09-01), McLaughlin
patent: 3500928 (1970-03-01), Rockwell
patent: 4203492 (1980-05-01), Watanabe
patent: 4732213 (1988-03-01), Bennett et al.

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