Use of alkali metal silicate foam with a chemical blowing agent

Details Use of alkali metal silicate foam with a chemical blowing agent Use of alkali metal silicate foam with a chemical blowing agent

1987-11-20

1989-07-18

Kisliuk, Bruce M.

Wells

Processes

Distinct, separate injection and producing wells

166272, 166292, 166309, E21B 4322

Patent

active

048484652

ABSTRACT:
A method for reducing the permeability in a desired area of a formation wherein a solid foam is formed in situ by injecting a one phase solution into the formation. Said solution comprises an alkali metal silicate, a chemical surfactant, and an alkali metal salt of azodicarboxylic acid in an amount sufficient to produce a foam. The azodicarboxylic acid salt decomposes when the pH is reduced to less than about 12 and generates gas in an amount sufficient to form a foam which subsequently hardens. When hardened the foam reduces the permeability in a desired area.

REFERENCES:
patent: 4142909 (1979-03-01), Gaines
patent: 4232741 (1980-11-01), Richardson et al.
patent: 4333764 (1982-06-01), Richardson
patent: 4340427 (1982-07-01), Sutton
patent: 4450010 (1984-05-01), Burkhalter et al.
patent: 4640361 (1987-02-01), Smith et al.
patent: 4665985 (1987-05-01), Berrod et al.
patent: 4676318 (1987-06-01), Myers et al.

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