FIELD: oil and gas industry.
SUBSTANCE: invention relates to oil industry, in particular to compositions for isolation of water influx in production and injection wells, and is intended for performance of water shutoff works in wells. Composition contains 8.0–15.0 wt% of sodium silicate and 85–92 wt% of fresh water. Additionally, composition contains 1.0–1.7 wt% of chromium acetate over 100 % and 0.2–1.0 wt% of sodium chloride over 100 %.
EFFECT: high efficiency of isolating water influx by creating a homogeneous low-toxicity safe formulation while maintaining its technological properties with a wide range of gel formation and improving strength of the formed gel.
1 cl, 1 tbl
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