FIELD: oil and gas industry.
SUBSTANCE: magnesia plugging material comprises a magnesium-containing binding agent, magnesium chloride and additives, at that the builder's calcined magnesite is used as the magnesium-containing binding agent, among the additives it contains a water-repellent agent being silicone oil and a hardening retarder being nitrilotrimethylphosphonic acid with the following ratio of components, wt %: builder's calcined magnesite - 70-80, magnesium chloride - 20-30, silicone oil - 0.1-0.5% above 100%, nitrilotrimethylphosphonic acid - 0.02-0.1 above 100%.
EFFECT: improved rate of the solution hardening and strength of the produced cement stone.
2 cl, 3 tbl
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