Wells – Processes – Distinct – separate injection and producing wells
Patent
1984-12-03
1987-11-17
Novosad, Stephen J.
Wells
Processes
Distinct, separate injection and producing wells
166274, E21B 4322
Patent
active
047067527
ABSTRACT:
The permeability of higher permeability zones of a subterranean reservoir of heterogeneous permeability is reduced by injecting an aqueous solution of a water soluble surface active agent and then a gas mixture comprising carbon dioxide and a noncondensible, non-hydrocarbon gas insoluble in viscous crude. A stable foam forms in situ useful for blocking escape of solvent fluids into the higher permeability zones of the reservoir during enhanced recovery, typically by carbon dioxide flooding.
Preferably, the solution of surface active agent and the gas mixture are injected in alternating slugs to enhance foam formation.
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Bostich June M.
Kisliuk Bruce M.
Novosad Stephen J.
Sandford Dean
Union Oil Company of California
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