Method for preventing two-way hydraulic shock absorber from withdrawing and shock absorber

Abstract

The invention discloses a method for preventing a two-way hydraulic shock absorber from buckling and the shock absorber. The method is to set the limit component at the lower end surface of the connecting body in the outer casing of the two-way hydraulic shock absorber; the connecting body and the oil cylinder are connected by torque transmission thread, and the torque transmission thread between the connecting body and the oil cylinder is used to prevent connection. The connection thread between the body and the cylinder is buckled. The invention cancels the easy-release screw connection between the centering outer cylinder and the spline body in the existing two-way hydraulic shock absorber, and moves the limiting surface to between the lower connecting body and the limiting block. The limit block is composed of two half rings, which are directly snapped into the ring groove of the mandrel during installation and fixed with the limit block nut. In order to ensure the free rotation of the limiting block in the annular groove of the mandrel, the relative rotation between the mandrel and the limiting surface of the connecting body is eliminated. At the same time, the connection thread between the connecting body and the oil cylinder is a torque transmission thread, which is always in the state of working torque, so as to ensure that the two-way hydraulic shock absorber will not fall off under the condition of low drilling pressure.

Description

technical field [0001] The invention relates to a method for preventing a two-way hydraulic shock absorber from buckling and the shock absorber, belonging to the technical field of drilling tools. Background technique [0002] During the drilling process, the drill string often has obvious drill jumping and vibration, and the torque can also cause the drill tool to lose its torsional stability. Therefore, in drilling operations, two-way hydraulic shock absorbers are often used to eliminate or slow down the impact load of these vibrations, so as to avoid or reduce the damage caused by vibration to drilling equipment, and achieve the purpose of increasing drilling speed and reducing drilling costs. [0003] The damping mechanism of the two-way hydraulic shock absorber is mainly composed of two parts: the longitudinal damping mechanism and the piston reversing mechanism. The damping element is a compressible liquid. Its working principle is mainly to use the compressible liqu...

AI Technical Summary

Problems solved by technology

[0004]The existing two-way hydraulic shock absorber uses the end face of the centralizing outer cylinder to limit the position. Due to the relative rotation of the mandrel and the outer cylinder during work, this structure has low drilling pressure. Under normal circumstances, the jumping drill of the drill bit makes the mandrel and the end face of the centralizing outer cylinder often contact, which is equivalent to continuously giving the thread of the centralizing external cylinder a rotating shock force, causing the thread to loosen. The lower part of the drilling tool falls off the bottom of the well

In this case, the operation must be stopped and various salvage methods used to salvage, causing great losses

Seriously affect the drilling schedule and economic benefits

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