SU128406A1 - Casing Extraction Device - Google Patents

Description

Devices are known for removing casing pipes from a well using Democrats and a mast with a clamp.

The difference between the described device lies in the fact that the carriage rests on screw jacks located symmetrically with respect to the borehole axis and driven through the gear system from the rotator of the drilling machine, displaced some distance from the wellhead when the pipe string is removed. This arrangement of the device ensures the horizontal position of the mast and prevents the pipe string from tilting.

The drawing shows the device in General.

The device consists of a mast 1, which rests on a nut 2 of screwdrivers 3 symmetrically located relative to the borehole axis. The device is driven through a gear system 4 from the rotator 5 of the drilling machine.

During the extraction of the casing string 6, the machine is displaced a distance from the wellhead. When the jack screws are rotated, the nuts get upwards moving, and the carriage connected with them lifts the pipes from the well. When the screws of the jack jack rotate in the opposite direction, the carriage nuts are lowered to the initial position and the carriage again clamps the tube of the column to move it upwards to the set stroke.

Subject invention

A device for extracting casing pipes from wells using jacks and a carriage with a wedge pipe clamp, characterized in that, in order to ensure the horizontal position of the carriage and prevent the pipe string from tilting when it is removed, the carriage

Ka "-. 128406i -; - 2 - .., -.

the nut of the screw democrats rests on the SI-M meter-spaced axis of the borehole and is driven through a transmission system from the rotator of the drilling rig: a machine displaced and a distance from the wellhead to the extraction of the pipe string.