Adjustable drill string axial-torsional coupling vibration suppression device

Abstract

The invention discloses an adjustable drill string axial-torsional coupling vibration suppression device. A rotation damping structure and an axial damping structure are provided inside the drill collar; during the working process, the mass block absorbs the energy generated by the vibration of the drill string, and through the rotating elastic element and the rotating The damping cylinder consumes the energy of rotational vibration, and consumes the energy generated by axial vibration through the axial spring and axial damping cylinder. The entire transposition is assembled through boss groove matching and snap-in. The installation efficiency is high, and the entire device is Damping, stiffness, and quality can be adjusted. The entire device is installed inside the drill collar. The flushing of drilling fluid helps to cool down the device and ensures the working performance of the system. Multiple vibration reduction devices can be installed in multiple drill collars to suppress 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 ...

AI Technical Summary

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

Images