FIELD: oil and gas industry.
SUBSTANCE: invention relates to the oil-producing industry. Anti-flight device for tubing string comprises perforated hollow tubular part, on which there is a sleeve with a tapered outer lower surface, extending in the radial direction from the pipe of the die located below the sleeve with a cone-shaped external lower surface and made with chamfers on the side facing the hollow tubular part for interaction with the said cone-shaped surface of the bushing at the motion of this bushing in direction to slips, as well as anchoring mechanism. Saws are mounted on tubular element, which covers hollow tubular part and is fixed on this part by shear screws. Attaching mechanism includes cams arranged below level of shear screws location, mounted cams pressed towards walls of hollow tubular part and made with chamfers on side facing hollow tubular part, and located below cams and spring-loaded towards cams bushing with cone outer surface in upper part facing cams to interact with their bevels during this bushing in direction to them for their separation in radial direction.
EFFECT: technical result consists in improvement of device operational reliability.
1 cl, 1 dwg
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