Vertical tar tube anti-jacking slip

Abstract

The invention discloses a vertical tar tube anti-jacking slip, which is mainly applied to an tar tube clamping tool for preventing an tar tube from moving upwards when the tar tube is jacked out with the pressure under a petroleum well. The vertical tar tube anti-jacking slip comprises a vertical slip seat (1), a slip body (2), a hydraulic cylinder (3), a supporting plate (4), a connecting rod piece (5), an upper pin shaft (6), a lower pin shaft (7) and a tension spring (8). The vertical tar tube anti-jacking slip is of an integral lifting structure and is fixedly connected with a snubbing unit, the operation on a power end is finished by one driller, the wedge-shaped slip body is provided with different-size slip teeth so as to effectively clamp the tar tube more and more tightly; a tube pillar is prevented from being jacked out by the formation pressure; additionally, the central force is large, and the force vertically clamping or loosening the tube pillar is large, the work is reliable, the personal safety and device safety can be ensured when the tube pillar is jacked up or down, and the smooth construction operation can be ensured.

Description

technical field [0001] The invention relates to a vertical oil pipe clamping tool, which is a vertical anti-top slip for oil pipes, in particular a remote hydraulic operation driven by a fixed slip seat and a vertical acting hydraulic cylinder, which is used for oil under pressure operations. Vertical tubing anti-slips to prevent the tubing from running up. Background technique [0002] During oil workover operations, it is necessary to take out the oil pipes one by one in the well, and the formation pressure is very high. When the weight of the remaining pipe string in the well is less than the formation pressure, the oil pipe string will automatically rise under the push of the formation pressure, which brings great pressure to the oil pipe extraction operation. Lots of difficulties and dangers. In the past, most workover operations used the method of releasing the formation pressure before the workover, and then the tubing operation, but releasing the formation pressure ...

AI Technical Summary

Problems solved by technology

Also use the lever principle to pry the connecting body built in the housing to move up and down, and clamp or loosen the oil pipe through the slip teeth on the connecting body. The degree of automation is low, and the centering force is small, and the force to loosen the oil pipe is not strong enough, and The above two patents use the principle of leverage, resulting in a large volume of anti-top slips, which is very inconvenient to install and maintain.

Another Chinese patent: ram-type two-way self-tightening sealing slips (CN201320238790.8) uses a hydraulic cylinder and a hydraulic control system to drive the slips to clamp or loosen the tubing in two directions. Slips have the functions of load-bearing slips and anti-top slips at the same time, but due to the limited clamping force due to the compact size and space size, it cannot be used for heavy-duty anti-top or load-bearing functions. When the slips loosen the oil pipe, the internal space is limited and cannot Use special tools, and the parts need to be disassembled when replacing the slips. The maintenance operation is cumbersome, and it cannot meet the needs of most workover operations for lifting the tubing and using special tools.

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