E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
166/33
E21B 43/22 (2006.01) C02F 5/02 (2006.01) C09K 8/54 (2006.01) C09K 8/58 (2006.01) E21B 41/02 (2006.01) E21B 43/20 (2006.01)
Patent
CA 1072879
"Abstract of the Disclosure" 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 fol- lowed 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 for- mation of precipitates which partially plug that portion of the reservoir in which the contact occurs and reduces the perme- ability 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.
284464
Darr Russell C.
Elchlepp Dale L.
Sarem Amir M.
Spratt Robert B.
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