E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
166/33
E21B 43/20 (2006.01) C09K 8/58 (2006.01)
Patent
CA 1111343
ABSTRACT OF THE DISCLOSURE In the displacement of crude oil through a sub- terranean reservoir with an aqueous displacement fluid, improved oil recovery is obtained by providing a salinity contrast between the displacement fluid and aqueous forma- tion fluid. The salinity of the displacement fluid is selected such that at least one mixture of the aqueous displacement and the aqueous formation fluid will have the minimum interfacial tension between the displaced crude oil and mixtures of these fluids. The minimum interfacial tension between crude oil and mixtures of aqueous dis- placement and formation fluids can be determined by mixing these fluids such that some mixtures contain from essen- tially none to essentially all displacement fluid and det- ermining the interfacial tension between the mixtures and the crude oil. The displacement fluid is a micellar fluid followed by a polymer-containing aqueous fluid. Further improvements in oil recovery are obtained when this salinity contrast is provided and the salinity of the polymer-containing fluid is less than the salinity of the mixture which provides the minimum interfacial tension with the crude oil.
333252
Gowling Lafleur Henderson Llp
Standard Oil Company
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