FIELD: oil-and-gas production.
SUBSTANCE: proposed acid-soluble backfill composition comprises backfill Portland cement, dust from electric filters of cement plants, admixture of silica-alumina composition and water. Additionally, it includes gypsum-alumina expanding cement and super plasticiser "ЦЕМПЛАСТ МФ" or Melflux and silica-alumina microspheres as said admixture at the following ratio of components, in wt % backfill Portland cement 17.6-33.5, gypsum-alumina expanding cement 3.3-17.6, said cement dust 3.3-20.1, said super plasticiser 0.06-0.13, silica-alumina microspheres 6.7-30.0, water 32.8-41.3.
EFFECT: complete acid-solubility of cement stone, higher strength.
1 ex, 2 tbl
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