发明名称 |
Method for imparting selectivity to polymeric gel systems |
摘要 |
A method for imparting selectivity to an in-situ gel-forming composition for placement within a subterranean oil-bearing formation having relatively high permeability zones and relatively low permeability zones, comprising the steps of: preparing an aqueous-based mixture, the mixture comprising: a first stage gel-forming composition in an amount effective to selectively enter the relatively high permeability zones of the formation, the first stage composition including a heteropolysaccharide prepared by growing Xanthomonas campestris NCIB 11854 in an aqueous nutrient medium by aerobic fermentation and recovering the heteropolysaccharide and a crosslinking agent for the heteropolysaccharide; and at least one second stage in-situ gel-forming composition comprising a water-dispersible polymer and a crosslinking agent for the water-dispersible polymer in an amount effective to form a stable gel; and gelling the first stage gel-forming composition ex-situ by reacting the Xanthomonas campestris NCIB 11854 heteropolysaccharide with the crosslinking agent for the heteropolysaccharide. The mixture so prepared exhibits greater selectivity than would a like mixture in the absence of the first stage selective gel-forming composition.
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申请公布号 |
US5156214(A) |
申请公布日期 |
1992.10.20 |
申请号 |
US19900628042 |
申请日期 |
1990.12.17 |
申请人 |
MOBIL OIL CORPORATION |
发明人 |
HOSKIN, DENNIS H.;SIFFERMAN, THOMAS R. |
分类号 |
C09K8/88;C09K8/90;E21B43/26 |
主分类号 |
C09K8/88 |
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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