| 摘要 |
FIELD: chemistry. ^ SUBSTANCE: invention relates to compositions for sealing influx of formation water into oil, gas and oil-and-gas wells and can be used in oil-and-gas industry. The backfilling composition for selective sealing of influx of formation water contains the following, wt %: gel-forming clay - bentonite 5.5 - 7.5, filler - expanded-clay powder 5.5-7.5, sodium silicate - liquid glass with density 150020 kg/m3 35-45, sodium silicofluoride 3.5-4.5, alkali metal carbonate 0.5 - 1.5, alkali metal chromate 0.05-0.09, CMC-Na 0.3-0.5, fresh water - the balance. ^ EFFECT: high efficiency of sealing water influx. ^ 4 tbl |
