Wells – Processes – Distinct – separate injection and producing wells
Patent
1978-07-06
1981-10-27
Novosad, Stephen J.
Wells
Processes
Distinct, separate injection and producing wells
166274, 166294, E21B 33138, E21B 4322
Patent
active
042968119
ABSTRACT:
Sweep efficiency of a post-primary oil recovery process in an oil-bearing subterranean formation containing a high concentration of divalent ions such as Ca.sup.++ and Mg.sup.++ in the connate water is improved by injecting a surfactant system which forms a macroemulsion in situ so as to selectively plug the more permeable zones. The surfactant system is characterized by a relatively low viscosity and is composed of a predominantly sodium chloride brine, a petroleum sulfonate surfactant, a cosurfactant, and no more than 1 percent oil. This composition possesses sufficient fluidity to penetrate quite deeply into the formation and yet tends to form a macroemulsion on contact with high concentrations of divalent ions in the connate water so as to selectively plug the more permeable zones.
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Morris Charles W.
Terry Ronald E.
Novosad Stephen J.
Phillips Petroleum Company
Suchfield George A.
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