FIELD: strengthening of oil and gas holes. SUBSTANCE: complex reagent has, wt. -%: hypan 7-8; 2-hydroxy-1,3-propylenediaminotetramethylphosphonic acid tetrasodium salt 3.5-4.0; sodium hydroxide 38-40, and water - the rest. Hypan and tetrasodium salt of 2-hydroxy-1,3-propylenediaminotetramethylphosphonic acid were taken at the ratio 2:1. EFFECT: increased safety of strengthening at raised and high temperatures. 2 tbl
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