FIELD: oil and gas well casing and cementing. SUBSTANCE: complex reagent for grouting mortars containing corylate - mixture of sodium salts of nitrilotrimethylphosphonic acid additionally includes polyvinylacetate dispersion with the following ratio of components, mas.%: corylate, 0.02-0.4; polyvinylacetate dispersion, 99.60-99.98. EFFECT: increased quality of well casing and cementing, and increased well overhaul period due to higher adhesive and isolating properties of plugging stone, and provision of control of mineral resources and environment. 1 tbl
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