Wells – Processes – Distinct – separate injection and producing wells
Patent
1977-12-22
1979-08-28
Guynn, Herbert B.
Wells
Processes
Distinct, separate injection and producing wells
166273, 252 855D, E21B 4322
Patent
active
041657853
ABSTRACT:
The amount of oil recoverable from a subterranean, petroleum-containing, permeable formation by surfactant water flooding is improved if at least two separate slugs of surfactant-containing fluid are injected into the formation, the first being a fluid containing a surfactant which is an effective emulsifier for the petroleum in the formation and the second surfactant fluid containing a surfactant which does not produce an emulsion between the aqueous fluid and the formation petroleum, but which is effective for achieving maximum oil recovery, or for achieving the minimum interfacial tension between the aqueous phase present in the flow channels of the formation and the formation petroleum. In one embodiment, both surfactants are an aliphatic (e.g. alkyl) or alkylarylpolyalkoxyalkyl sulfonate, differing only in the average number of alkoxy groups per molecule. The first emulsifying surfactant contains an average of from 0.2 to 0.8 fewer alkoxy groups than the second surfactant.
REFERENCES:
patent: 3294164 (1966-12-01), Hardy et al.
patent: 3358758 (1967-12-01), Hardy et al.
patent: 3866680 (1975-02-01), Dauben
patent: 3888308 (1975-06-01), Gale et al.
patent: 3977471 (1976-08-01), Gale et al.
patent: 4018278 (1977-04-01), Shupe
Guynn Herbert B.
Park Jack H.
Ries Carl G.
Texaco Inc.
Whaley Thomas H.
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