Wells – Processes – Distinct – separate injection and producing wells
Patent
1977-12-22
1979-07-10
Guynn, Herbert B.
Wells
Processes
Distinct, separate injection and producing wells
166273, E21B 4322
Patent
active
041604806
ABSTRACT:
The conformance of an enhanced oil recovery process, including waterflood, surfactant or other chemicalized water flood process, in a formation containing at least two strata or zones of varying permeability, the permeability of one zone being at least 50 percent greater than the permeability of the other zone, is improved by flooding until the higher permeability zone has been depleted, after which an aqueous fluid is injected into the high permeability zone, said fluid having relatively low viscosity at the time of injection and containing a particular surface active agent which promotes the formation of a coarse emulsion in the flow channels of the formation which reduces the permeability of the high permeability zone. After the permeability of the first zone has been reduced substantially, flooding may then be accomplished in the second zone which was originally not invaded by the injected oil recovery fluid since its permeability was substantially less than the permeability of the first zone. The surface active agents are individually tailored and the ratio of dissimilar surfactants balanced to exhibit optimum emulsion formation properties with the particular aqueous fluid present in the flow channels of the formation to be treated.
REFERENCES:
patent: 3294164 (1966-12-01), Hardy et al.
patent: 3358758 (1967-12-01), Hardy et al.
patent: 3811504 (1974-05-01), Flournoy et al.
patent: 3866680 (1975-02-01), Dauben
Park Jack H.
Schievelbein Vernon H.
Guynn Herbert B.
Park Jack H.
Ries Carl G.
Texaco Inc.
Whaley Thomas H.
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