Drilling magneto-rheological shock absorption device

Abstract

The invention discloses a drilling magneto-rheological shock absorption device which comprises a working cylinder and a piston rod. A piston is fixed to the tail end of the piston rod. A plurality of leakage holes are formed in a body of the piston. The apertures of the leakage holes gradually increase from middle to two ends. A coil set is arranged in the middle of the piston. A connecting wire of the coil set penetrates through the piston rod to be connected with an external power supply. The interior of the working cylinder is divided into a fluid cavity and a gas cavity through the floating piston. During work, the apertures of the leakage holes gradually increase from middle to two ends, middle necking of the leakage holes is achieved, the grabbing force exerted on the piston by magneto-rheological liquid at the two ends above and below the necking position is increased, and it is ensured that the piston rapidly stops running in the liquid cavity; meanwhile, through the rapid conversion of external voltage, the piston starts and stops moving in the working cylinder; a throttling valve with a changeable throttling area is not installed in the shock absorption device, and therefore the mechanical abrasion resistance of the device is greatly improved, and the service life of the device is prolonged.

Description

technical field [0001] The invention relates to a damping device, in particular to a drilling magnetorheological damping device. Background technique [0002] In oil drilling, the drilling tool is driven to break the rock, drill into the ground, and drill a wellbore with a specified depth for the oil or gas extraction machine to obtain oil or natural gas. a regular oil drill rig It is mainly composed of power machine, transmission machine, working machine and auxiliary equipment. The drilling tool is equipped with a hoisting system for lifting and lowering the drilling tool, running the casing, controlling the drilling pressure, and feeding the drilling tool; the lifting system includes a winch, auxiliary brake, crown block, traveling block, hook, wire rope and lifting ring , Elevators, hanging clamps, slips and other tools. When hoisting, the winch drum winds the steel wire rope, the crown block and traveling block constitute the auxiliary pulley block, and the hook rise...

AI Technical Summary

Problems solved by technology

These adjustable shock absorbers change the flow area by adjusting the opening size of the orifice, so as to adjust the damping coefficient, and the output damping force changes with the stroke of the piston on the shock absorber; but when dealing with a large impact It must be realized by reducing the throttle and increasing the stroke of the piston, resulting in an increase in the quality of the drilling tool during drilling

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