DEVICE FOR STRAIGHTENING CRUMPLED CASING STRINGS Russian patent published in 2023 - IPC E21B29/10 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to straightening crumpled casing strings in oil and gas wells. The device includes a pusher with a central axial channel. The upper end of the pusher is connected to the box sub, and the lower end is connected to the guide pipe. The outer side surface of the pusher is divided by a stepped annular collar into upper and lower parts. Between the guide pipe and the annular collar on the outside of the lower part of the pusher, with the possibility of axial movement relative to it, load-bearing and transition sections, a thrust bearing with lower and upper races, a support sleeve and an adjusting washer are installed. A cylindrical spring is located outside the pusher. The transition and load-bearing sections have the shape of a hollow truncated cone with through radial channels, in which rolling balls are placed with the possibility of axial movement and rotation. The support sleeve has the shape of a hollow cylinder with a bottom in which a central axial channel is made to accommodate the pusher. A thrust bearing is placed between the transition section and the support sleeve to neutralize the torque. The adjusting washer is installed inside the support sleeve.

EFFECT: reliability and efficiency of the device increases.

1 cl, 5 dwg