Wells – Processes – Distinct – separate injection and producing wells
Patent
1981-03-30
1984-02-28
Novosad, Stephen J.
Wells
Processes
Distinct, separate injection and producing wells
166273, E21B 4322
Patent
active
044337302
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 cosurfactant concentration is graded from a low cosurfactant concentration at the front of the bank to a low concentration of surfactant at the rear.
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Foster, "A Low-Tension Waterflooding Process", Journal of Petroleum Technology, vol. 25, Feb. 1973, pp. 205-210.
Brown Scott H.
Hook Fred E.
Novosad Stephen J.
Standard Oil Company
Suchfield George A.
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