Selectively plugging the more permeable strata of a...

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

E - Fixed Constructions

21

B

166/16

E21B 33/13 (2006.01) C09K 8/504 (2006.01)

Patent

CA 1056299

"Abstract of the Disclosure" 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 in- jected 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.

263658

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