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Process for the selective reduction of water inflows in oil or gas producing wells

  • US 4,842,071 A
  • Filed: 03/07/1988
  • Issued: 06/27/1989
  • Est. Priority Date: 03/06/1987
  • Status: Expired due to Term
First Claim
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1. A process for the selective reduction of water inflows from an oil or gas producing formation towards a production well, comprising the successive steps of:

  • (a) injecting from a production well, into at least a part of the formation, an aqueous dispersion or solution of a non-hydrolyzed polyacrylamide or of a nonhydrolyzed copolymer of acrylamide with at least one other comonomer,(b) injecting from said production well into said part of the formation an alkali metal basic compound and maintaining conditions providing for an at least partial hydrolysis of the polyacrylamide or of the copolymer, so as to plug said part of the formation selectively with hydrolyzed polyacrylamide or copolymer of acrylamide with at least one other comonomer, and(c) placing said production well in condition of oil or gas production and recovering the produced oil or gas from said selectively plugged formation containing said hydrolyzed polyacrylamide or copolymer through said production well.

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