Adjustable axial-torsion coupling vibration suppression device for drill string

Abstract

The invention discloses an adjustable axial-torsion coupling vibration suppression device for a drill string. A rotary damping structure and an axial damping structure are arranged in a drill collar.In the working process, a mass block absorbs the energy generated by the vibration of the drill string, the energy generated by the torsional vibration is consumed by a rotary elastic element and a rotary damping cylinder, and the energy generated by the axial vibration is consumed by an axial spring and an axial damping cylinder. The assembly of the whole transposition is through the match and the clamping of a boss and a groove, which is of high installation efficiency. The damping, stiffness and mass of the adjustable axial-torsion coupling vibration suppression device for a drill string can be adjusted. The adjustable axial-torsion coupling vibration suppression device is arranged inside the drill collar. The scour of the drilling fluid is beneficial to the cooling of the suppression device, so that the working performance of the system is ensured. A plurality of adjustable axial-torsion coupling vibration suppression device can be arranged in a plurality of drill collars to suppress the vibration of the entire drill string.

Description

technical field [0001] The invention relates to the technical field of drilling, in particular to an adjustable drill string axial-torsional coupling vibration suppression device. Background technique [0002] During the drilling process, as the depth of the drill hole increases, the length of the drill string will continue to increase, reaching a length of several thousand meters. At this time, the rigidity of the drill string will be greatly reduced. The column generates self-excited vibrations. The self-excited vibration frequency of the drill string is very close to the natural frequency of the drill string, which can easily lead to the intensification of drill string vibration and instability, and can easily lead to premature fatigue damage of the drill string, and even cause the drill string to break. The self-excited vibration of the drill string is mainly manifested as axial vibration along the length of the drill string and torsional vibration along the rotational ...

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Problems solved by technology

[0004] For the drill string vibration suppressing device in the prior art, there are generally following deficiencies: 1. It is necessary to redesign the drill string drill bit connection device, which is costly and difficult to guarantee the strength; 2. The spring stiffness, damping and quality of the existing vibration damping device are not It cannot be adjusted, resulting in poor vibration damping effect, and even causing resonance to aggravate the vibration of the drill string; 3. The existing vibration damping devices only suppress the axial vibration of the drill bit or convert torsional vibration into axial vibration and then suppress it. The vibration suppression effect is poor; 4. The active drill bit vibration suppression device needs to install sensors, solenoid valves, and cables, and the reliability is poor in the face of harsh deep well environments; 5. The drill bit of the passive drill bit vibration suppression device will be compressed when it is cut. The disc spring thus causes the piston to move prematurely in the cylinder, making the unit less sensitive to vibrations

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