Foam mixture for steam and carbon dioxide drive oil recovery met

Details Foam mixture for steam and carbon dioxide drive oil recovery met Foam mixture for steam and carbon dioxide drive oil recovery met

1992-11-16

1994-03-22

Suchfield, George A.

Wells

Processes

Distinct, separate injection and producing wells

166268, 166373, 166274, 166309, 252 8554, E21B 4322, E21B 4324

Patent

active

052955400

ABSTRACT:
The invention is a foam method for improving conformance during a steam flood or carbon dioxide flood in a subterranean, oil-containing formation penetrated by at least one injection well and at least one production well. In a steam flood oil recovery process, sweep efficiency is improved by injecting steam until steam breakthrough occurs at the production well after which a mixture of steam, a noncondensible gas, and an aqueous surfactant-starch solution is injected into the formation. The aqueous surfactant-starch solution forms a stable foam with the formation oil at formation conditions that reduce the permeability of the highly permeable steam swept zones thereby diverting the steam to other portions of the formation containing unswept oil. The starch is used as a partial substitute for the surfactant to improve the cost of the foam-forming mixture without reducing its effectiveness in increasing sweep efficiency.

REFERENCES:
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patent: 5046560 (1991-09-01), Teletzke et al.
patent: 5074358 (1991-12-01), Rendall et al.
patent: 5105884 (1992-04-01), Sydansk
patent: 5129457 (1992-07-01), Sydansk
patent: 5193618 (1993-03-01), Loh et al.

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