A magnetic repulsion damping shock-absorbing drilling tool

Abstract

The invention discloses a magnetic repulsion damping shock absorbing drilling tool, which comprises an outer cylinder, a diverter head, a limit ring, an upper diverter plate, an isolation cylinder, an outer magnetic strip, a balanced rigid body, an inner magnetic strip, and a lower diverter plate. The inner side of the outer cylinder is a through hole with a larger diameter at the upper part and a slightly smaller diameter at the lower part. The guide head, the limit ring, the upper diverter plate, the isolation cylinder, and the lower diverter plate are installed in the upper through hole from top to bottom. The lower diverter plate is installed on the The through hole changes from large to small on the boss. Multiple sets of outer magnetic strips are installed on the inside of the isolation cylinder, and multiple sets of magnetic strips are installed at the bottom of the isolation cylinder. A balanced rigid body made of high-density tungsten alloy is placed in the isolation cylinder. The circle magnetic strip and the outer circle magnetic strip are parallel, and the magnetic poles are the same. The tool is installed in the drill string. When the drill string vibrates, it will instantly generate resistance in the opposite direction of the vibration, effectively reducing the drill string vibration during drilling in heterogeneous formations, hard formations and deep formations.

Description

technical field [0001] The invention relates to the technical field of oil and gas drilling, in particular to a magnetic repulsion damping shock absorbing drilling tool. Background technique [0002] During the drilling process, the rock breaking of the drill bit will cause the vibration of the drill string, and local stress concentration will occur in the drill string, thereby reducing the ROP and shortening the life of the drilling tool; especially when drilling in heterogeneous formations and hard formations, there will be more Violent drilling jumps and broken drilling tools have brought huge risks to drilling operations. Usually, the method of drilling with light weight on bit in special formations can achieve a certain safe drilling effect, but it cannot significantly reduce the vibration of the drilling tool, and the ROP is further reduced, resulting in long drilling cycle and high cost; Vibration tool, relying on its hydraulic cylinder to buffer the vibration of the...

AI Technical Summary

Problems solved by technology

Usually, the method of drilling with light weight on bit in special formations can achieve a certain safe drilling effect, but it cannot significantly reduce the vibration of the drilling tool, and the ROP is further reduced, resulting in long drilling cycle and high cost; Vibration tool, relying on its hydraulic cylinder to buffer the vibration of the drill string, can reduce the axial vibration of the drilling tool to a certain extent, but the shock absorption force is limited, and its use is limited by many factors such as drilling pressure, drilling speed, pump pressure, formation and so on , it is difficult to achieve good application effect

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