FIELD: well drilling, particularly, plugging materials designed for cementing of oil-gas, geothermal, injection and other special wells with abnormal operating conditions. SUBSTANCE: plugging composition includes butyl rubber and paraquinone dioxime, and additionally it contains organic solvent, adhesive additive, filler and manganese dioxide with the following ratio of components, wt. pts: butyl rubber, 100; paraquinone dioxime, 2-4; organic solvent, 400; adhesive additive, 5- 10; filler, 15-160; manganese dioxide, 2-4. EFFECT: higher deformability and adhesive properties of plugging composition under effect of thermomechanical loads at temperatures up to 170 C. 2 tbl, 2 ex _
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