FIELD: oil industry.
SUBSTANCE: invention can be used in formations with temperature above 60 °C, including carbonate, for isolation of water inflows into production wells, associated with breakthrough of bottom, edge or injected water, as well as violation of integrity of well structure. Composition contains 2–16 wt.% of aluminum (III) salt, 2–16 wt.% carbamide, 0.1–0.2 wt.% of non-ionic surfactant and water with mineralization from 150 to 250 g/l—the rest.
EFFECT: increased efficiency of water influx isolation, extended gelation time and reduced filtration resistance in the process of gel-forming composition pumping to the formation zones remote from the well shaft.
1 cl, 1 dwg, 2 tbl, 5 ex
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