FIELD: oil producing industry; applicable for limiting and shutoff of formation water inflow to well in development of oil fields. SUBSTANCE: composition for formation water shutoff contains, wt.%: alkali metal silicate 0.3-4.0; salt of alkali-earth metal 0.01- 0.08; salt of alkali metal 0.2-0.4; polymethylsiloxan 0.2-0.6; the balance, water. Alkali natal silicate is used in composition in form of siallite. EFFECT: provided strong nonwashable shutoff system in water-saturated intervals of oil formation. 1 tbl
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