FIELD: oil and gas production. SUBSTANCE: invention is intended for limiting water inflow by sealing casing string, abolishing annulus blowouts, and insulating watered interlayers in wells. Water inflow insulation composition contains 30-90% resol-type phenol-formaldehyde resin and compositional hardener including formalin (8-60%) and sodium hydroxide (2- 10). Alternatively, 5-20% of polyatomic alcohol (ethylene glycol, diethylene glycol, or glycerin) or 1-10% of filler (wood flour, cement, or mud powder) are supplementary added. EFFECT: increased adhesion to cement stone and rock formed by terrigenous and carbonate reservoirs and lowered viscosity enabling penetration into porous medium. 3 cl, 1 dwg, 3 tbl, 14 ex
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