Optimum grading of chemical concentrations in a micellar flood

Details Optimum grading of chemical concentrations in a micellar flood Optimum grading of chemical concentrations in a micellar flood

E - Fixed Constructions

21

B

166/31

E21B 43/28 (2006.01) C09K 8/58 (2006.01)

Patent

CA 1169761

ABSTRACT Any method for tertiary recovery of oil from an oil reservoir penetrated by injection and producing wells in which injected fluid, either the micellar or polymer bank, is formulated so that the front portion of the bank is miscible with oil and the rear portion is miscible with water, In one method of formulating the graded bank or banks, the salinity of the bank is graded from a high salinity at the front to a low salinity at the rear. Another method of formulating the bank, the cosurfacant concentration is graded from a low cosurfactant concentra- tion at the front of the bank to a low concentration of surfactant at the rear. SHB:h 82056ART0078

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