Wells – Processes – Distinct – separate injection and producing wells
Patent
1978-02-13
1979-02-20
Novosad, Stephen J.
Wells
Processes
Distinct, separate injection and producing wells
166263, 166273, 166292, 166293, 166295, E21B 4322, E21B 33138
Patent
active
041401832
ABSTRACT:
A process for recovering oil from a heterogeneous subterranean reservoir having strata of widely varying permeability by injecting therein via a well a slug of a micellar solution followed by an aqeuous drive fluid wherein, at some time prior to the injection to all of the slug of the micellar solution, there is injected into the reservoir one or more aqueous solutions of reagents that react in the reservoir to form a plugging material, one of which reagents contains a polyvalent cation. After the plugging material has formed, the well is produced to remove from the reservoir the unreacted reagent containing a polyvalent cation which polyvalent cation would otherwise react with and reduce the efficiency of the subsequently injected micellar solution.
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Floyd Gerald L.
Hartman Richard C.
Novosad Stephen J.
Sandford Dean
Suchfield George A.
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