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 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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