Wells – Processes – Distinct – separate injection and producing wells
Patent
1991-09-12
1993-08-10
Suchfield, George A.
Wells
Processes
Distinct, separate injection and producing wells
166273, 166274, 166294, 166309, E21B 33138, E21B 4322, E21B 4324
Patent
active
052340546
ABSTRACT:
A method for improving the sweep efficiency of gas or steam flooding operations by reducing the permeability of relatively high permeability thief zones of an oil bearing subterranean reservoir having heterogeneous and/or fracture permeability and that is penetrated by at least one well is disclosed. A controlled quantity of a surfactant is injected into a high-permeability zone of a reservoir. Controlled quantities of a gas and a subsequent surfactant are then injected, simultaneously or alternatively into the same well, so that a controlled amount of foam having a controlled quality is generated in the high permeability zone, thereby reducing permeability. Following foam emplacement, a chase gas may be injected, and the steps of injecting surfactant and gas may be repeated as necessary to lower the gas-oil ration of non-problem offset producing wells to a preset limit.
REFERENCES:
patent: 4597442 (1986-07-01), Dilgren et al.
patent: 4617995 (1986-10-01), Lau
patent: 4706752 (1987-11-01), Holm
patent: 4852653 (1989-08-01), Borchardt
patent: 5052487 (1991-10-01), Wall
patent: 5086840 (1992-02-01), Soucemarianadin et al.
Carson M. W.
Chevron Research and Technology Company
Suchfield George A.
Turner W. K.
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