FIELD: oil and gas industry, particularly equipment to provide production strings of old wells with liners having lesser diameters.
SUBSTANCE: device has sub adapted to connect the device to drilling string, case, shaft and sealing member. The device is also provided with hollow rod having key, seat for ball receiving, shoe, anchor connected to shaft, left sub installed to cooperate with shaft and case provided with retaining rings. The anchor has stop member. Annular grooves are formed in shaft and in left sub. The shoe is connected to the anchor and has longitudinal grooves. Seat comprises cone member and splines projecting into longitudinal shoe grooves. The seat is installed in axial shaft channel so that seat may perform limited displacement and cooperate with stop members.
EFFECT: increased efficiency of production string cementation and device drilling-out.
7 dwg
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