Wells – Processes – Distinct – separate injection and producing wells
Patent
1976-10-12
1977-10-04
Novosad, Stephen J.
Wells
Processes
Distinct, separate injection and producing wells
166244C, 166273, 166292, E21B 4322, E21B 33138
Patent
active
040519015
ABSTRACT:
A process for recovering petroleum from subterranean reservoirs where high salt content water is used in a secondary recovery process consisting of forming as the displacement fluid a dilute alkaline silicate solution utilizing the high salt content water and filtering the alkaline flooding solution to remove scale-forming alkali insoluble salts which include a substantial proportion of calcium and magnesium salts. The filtered solution is injected into the reservoir and this is followed by an injection of a slug of substantially neutral water. A dilute acid solution is utilized to contact and dissolve the alkaline insoluble salts which have been filtered from the alkaline solution and the thus formed solution which includes a substantial portion of soluble calcium and magnesium salts is injected into the reservoir for subsequent contact with the alkaline silicate solution. This contact results in the formation of precipitates which partially plug that portion of the reservoir in which the contact occurs and reduces the permeability thereof. The process is repeated a plurality of times until the desired amount of alkaline silicate solution has been injected into the reservoir whereupon untreated water can be injected as a drive fluid.
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Darr Russell C.
Elchlepp Dale L.
Sarem Amir M.
Spratt Robert B.
Hartman Richard C.
Novosad Stephen J.
Sandford Dean
Suchfield George A.
Union Oil Company of California
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