FIELD: oil-extracting industry. SUBSTANCE: apparatus has floating platform, rigidly fixed with auxiliary pillar, on upper end of which mechanism of pipes forced lowering is fixed, and outer surface of which bears fixed centering guides. Lower end of auxiliary pillar is mounted higher, than flange connection of mating assembly, and fixer of its position is situated at height of location of casing string stationary part. Fixer is made as segmental pins, linked with hydraulic drive. Pins are entering ring-type turnings on resting sleeve, which auxiliary pillar is provided with. Casing string has resting ring-type step to meet resting sleeve. EFFECT: increased reliability of operation. 2 dwg
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