FIELD: oil and gas industry. SUBSTANCE: gear to isolate strata in well includes sealing collar placed into cone- shaped rest with tabs and tail part. Rigid tabs of rest are mounted for centering of casing string. Tail part of rest is provided with partitions. Scrapers to rub off clay crust from walls of well and to generate turbulent motion of grouting mortar are put on partitions. EFFECT: increased reliability of isolation of strata and exclusion of complicated operation for correction of primary grouting.
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