FIELD: mining. SUBSTANCE: method for isolation of lost-circulation formation includes supply to well of granulated and fibrous filler and grouting mortar. Granulated filler is used of different fractions. Fraction density is taken equal to density of grouting mortar. Fibrous filler is made in form of rings. Rings are connected into chains. Ring diameter exceeds diameter of large fraction of granulated filler. Grouting mortar, fibrous and granulated fillers are fed to well simultaneously. Granulated filler is supplied in he order of increasing fractions. EFFECT: higher efficiency of isolation of formation with large channels due to reduced material consumption, decreased spreading of grouting mortar and reduced time taken for isolation.
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