FIELD: oil-and-gas industry.
SUBSTANCE: invention related to an expansion plugging material and can be used for serial manufacturing of ready to use, dry, finely graded plugging materials, used for absorbing zones sealing during a boring process, for wells of different use complete overhaul and cementing. The expansion plugging material contains wt %: pure plugging Portland cement 35-55, thermally treated at 900-1000°C clay with specific surface 400-600 m2/kg 40-60, half-water plaster 2-3, sulfonate 0.01-0.05, tartaric acid 0.01-0.05, sodium formate 0.01-0.45, sulfacell 0.3-0.5.
EFFECT: filtration decrease, sidementative stability increase.
2 tbl, 1 ex
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