Downhole multi-dimensional vibration self-suppression device and method

Abstract

The invention relates to a downhole multi-dimensional vibration self-suppression device and method, belonging to the field of drilling, comprising: an outer cylinder formed by combining multiple sections; At least one of a vibrating body and a drill string radial vibration damping body; wherein, the drill string axial vibration damping body is arranged inside the outer cylinder and is configured to absorb axial vibration; the drill string The radial damping body is arranged at the bottom of the outer cylinder and is configured to absorb vibrations along the radial direction. The invention can suppress vibrations in both the axial direction and the radial direction, and has better vibration reduction effect.

Description

technical field [0001] The invention relates to an underground multi-dimensional vibration self-suppression device, which belongs to the field of drilling tools and is used for vibration reduction of drill bits. The invention relates to a method for suppressing vibration of a drill bit. Background technique [0002] The oil and gas drilling process can be regarded as the transmission process of mechanical energy and hydraulic energy from the wellhead to the bottom of the well, in which the rock breaking at the bottom of the well is mainly input into the drill string system by the continuously rotating turntable, and the drilling pressure and torque are transmitted to the drill bit to realize the rock breaking at the bottom of the well. Crushing, and then the cuttings are carried out by hydraulic energy. [0003] Due to the large length-to-diameter ratio of the drill string system, the drill string system in the wellbore is similar to a flexible rod. During the drilling proc...

AI Technical Summary

Problems solved by technology

[0003] Due to the characteristics of the large length-to-diameter ratio of the drill string system, the drill string system in the wellbore is similar to a flexible rod. During the drilling process, the drill string will generate extremely complex nonlinear vibrations. The severe drill string vibration will lead to fatigue damage of the drill string. Affect drilling safety

At the same time, the vibration of the drill string will also cause the working state of the drill bit to be unstable, which will seriously affect the rock breaking efficiency and the life of the drill bit, and affect the drilling timeliness.

[0004] Drill string vibration is the coupling of multi-dimensional vibrations such as longitudinal vibration, torsional vibration and lateral vibration, and there is a strong correlation between various vibrations, and there are many factors affecting drill string vibration (drilling tool structure, drilling parameters, wellbore characteristics, etc.), strong randomness and poor regularity, conventional vibration damping tools cannot essentially suppress drill string vibration

Images