Method of reducing permeability in subterranean formation by...

Details Method of reducing permeability in subterranean formation by... Method of reducing permeability in subterranean formation by...

E - Fixed Constructions

21

B

31/14

E21B 43/22 (2006.01) C09K 8/518 (2006.01)

Patent

CA 1275356

ABSTRACT OF THE DISCLOSURE A method of reducing the permeability of an area of a subterranean formation is disclosed. An alkali metal silicate foam is produced by injecting into the formation a solution of alkali metal silicate and a chemical surfactant, and a non-condensible gas. The foam hardens into a substantially impermeable solid. The foam may be used to reduce permeability in areas of the formation which have been steam swept during steam stimulation cycles. Thus, subsequent steam stimulation cycles will be directed to uncontacted areas of the formation.

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