FIELD: well drilling. SUBSTANCE: compound for isolation of lost circulation zone contains, mas.%: bentonite 5-8; gamma-radiated polyacrylamide 0.4-0.6; sodium silicate 0.6-1.6; the balance, water. Introduced successively in water are gamma-radiated polyacrylamide and sodium silicate. Mixture is let stand for swilling for 1 h. Then, bentonite is introduced and mixed to attain homogeneous suspension. EFFECT: stabilized phase composition with preserved spread and reduced synthesis of formed gel. 1 tbl
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