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% sodium silicate, 85–92 wt% of fresh water. Composition further contains 0.5–2.0 wt% chromium acetate over 100 % and 0.1–5.0 wt% of wood flour in excess of 100 %.
EFFECT: higher efficiency of isolation of water influx into well due to expansion of gel formation time interval of composition, increase of gel strength at simultaneous expansion of technological capabilities of composition use in conditions of carbonate reservoirs, simplification of composition preparation.
1 cl, 1 tbl
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