FIELD: construction of oil and gas wells, particularly, their casing and repair. SUBSTANCE: plugging mortar includes cement and solving liquid containing water, polyvinyl alcohol and surfactant, and additionally, paraffin with the following ratio of ingredients, wt.%: cement, 64.20-65.70; paraffin, 0.98-3.28; polyvinyl alcohol, 0.33-0.40; surfactant, 0.16-0.32; water, the balance. EFFECT: higher durability and stability of plugging mortar in highly mineralized formation waters. 1 tbl, 1 ex
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