Selectively plugging water zones

Details Selectively plugging water zones Selectively plugging water zones

E - Fixed Constructions

21

B

166/26

E21B 43/16 (2006.01) C09K 8/502 (2006.01) E21B 33/138 (2006.01) E21B 43/32 (2006.01)

Patent

CA 1051340

SELECTIVELY PLUGGING WATER ZONES ABSTRACT A method for shutting off or decreasing the production of water from an oil well. An oil well producing excess water is taken off production and a gas is injected into the well, followed by a slug of clean oil containing an emulsifier. The well is then produced as fast as possible. The previously injected gas and water in water-producing zones begin to finger back through the oil slug and forms a viscous emulsion which blocks the further flow of water into the producing well. -1-

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