Use of alkali metal silicate foam with a chemical blowing agent
Patent
·
OSTI ID:5337827
This paper describes a method for reducing the permeability in a subterranean formation having at least one zone of greater permeability and at least one zone of lesser permeability. It comprises: injecting into the formation a solution comprising alkali metal silicate, a chemical surfactant, and a chemical blowing agent in an amount sufficient to produce foam in an amount sufficient to reduce permeability in a first zone of greater permeability where the blowing agent is a member selected from the group consisting of an alkali metal salt of azodicarboxylic acid, toluene sulfonyl hydrazide, or p,p'-oxbis benzenesulfonyl hydrazide; and causing the chemical blowing agent to decompose thereby generating gas in an amount and rate sufficient to form a foam in combination with the silicate and surfactant which foam subsequently hardens and reduces permeability in the first zone.
- Assignee:
- Mobil Oil Corp., New York, NY
- Patent Number(s):
- US 4848465
- Application Number:
- PPN: US 7-123615A
- OSTI ID:
- 5337827
- Country of Publication:
- United States
- Language:
- English
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