Wells – Processes – Distinct – separate injection and producing wells
Patent
1978-12-21
1980-12-23
Novosad, Stephen J.
Wells
Processes
Distinct, separate injection and producing wells
166252, 166274, 166275, E21B 4322
Patent
active
042405041
ABSTRACT:
A method of enhanced oil recovery is disclosed wherein an upper-phase or a middle-phase microemulsion and an immiscible aqueous phase are simultaneously injected into a subterranean formation. The viscosities of the injected phases are adjusted so that the aqueous phase/microemulsion viscosity ratio approximates the reservoir brine/oil viscosity ratio. The injection rates of the injected phases are such that similar oil, microemulsion and aqueous phase velocities are achieved in the reservoir. Oil is displaced to a production well and recovered.
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Szabo, M. T., "Some Aspects of Mobility Buffer Design in Surfactant Flooding," SPE 6201, 1976.
Szabo, M. T., "The Effect of Sulfonate/Polymer Interaction on Mobility Buffer Design," Society of Petroleum Engineers Journal, Feb. 1979. pp, 4-14.
Exxon Production Research Company
Nametz Michael A.
Novosad Stephen J.
Suchfield George A.
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