发明名称 Use of weak gels containing a polyacrylamide and glyoxale for selectively reducing water permeability
摘要 A process is described for selectively reducing water permeability in very permeable regions of underground formations by means of an aqueous gel formed by in situ crosslinking of an aqueous solution of a non-ionic polyacrylamide or of a non-ionic and non-hydrolysed acrylamide copolymer containing less than 5 % of N-alkylsubstituted groups. The crosslinking is carried out by injection of an amount of glyoxal so that the glyoxal/polyacrylamide or acrylamide copolymer molar ratio is less than 0.2, and at a pH less than 7.5. Application to oil recovery.
申请公布号 EP0539289(B1) 申请公布日期 1996.01.10
申请号 EP19920402875 申请日期 1992.10.21
申请人 INSTITUT FRANCAIS DU PETROLE 发明人 ZAITOUN, ALAIN;KOHLER, NORBERT
分类号 C08F8/28;C09K8/512;C09K8/88 主分类号 C08F8/28
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