E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
31/16, 166/33
E21B 43/22 (2006.01) C09K 8/584 (2006.01) E21B 43/20 (2006.01)
Patent
CA 1083953
ABSTRACT OF THE DISCLOSURE The amount of oil recoverable from a subterranean, petroleum-containing, permeable formation by surfactant water flooding is improved is at least two separate slugs of surfactant-containing fluid are injected into the forma- tion, 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 .2 to .8 fewer alkoxy groups than the second surfactant. The proper surfactant may be identified by determining which alkyl or alkylarylpolyalkoxy- alkyl sulfonate produces the maximum amount of emulsion with the formation brine and formation petroleum, employing that surfactant in the first surfactant fluid, and then employing a surfactant containing from .2 to .8 more alkoxy groups per molecule in the second surfactant fluid. In a slightly different embodiment, the alkyl or alkylarylpoly- alkoxyalkyl sulfonate which achieves the minimum interfacial tension between the aqueous fluid present in the formation flow channels and the formation petroleum is identified, and is utilized in the second surfactant fluid, and the surfactant employed in the first fluid contains from .2 to .8 fewer alkoxy groups per molecule than the surfactant in the second fluid.
316471
Gowling Lafleur Henderson Llp
Texaco Development Corporation
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