Device for converting longitudinal vibration of drill string into torsional shock of drill bit

Abstract

The invention relates to a device for converting the longitudinal vibration of a drill stem into the torsional impact of a drill bit. A longitudinal vibration assembly comprises a vibration transmission shaft which is connected with a limiting sleeve and a spline body, wherein a vibrator is connected to the bottom of the vibration transmission shaft, and an impact lug is arranged on the vibrator; a resetting torsion transmission assembly comprises a spline shell, a spring, a transition joint and an impactor shell; the upper part and the lower part of the spring are respectively in contact with the lower part of the limiting sleeve and the upper part of the transition joint; a torsion generation transmission assembly comprises an impact hammer; the impact hammer is arranged in a drill bit base, a spiral groove is formed in the impact hammer, and the impact lug is matched with the spiral groove; an inner spline is arranged in the spline shell, and the spline body is matched with the inner spline; a shell spline is arranged on the lower end of the impactor shell; a base body spline is arranged at the lower end of the drill bit base; the shell spline is matched with the base body spline. The device disclosed by the invention can be used for converting the harmful longitudinal vibration of the drill stem into circumferential high-frequency torsional impact vibration of the drill bit in the drilling process, so that the mechanical drilling speed is improved.

Description

technical field [0001] The invention belongs to the field of drilling engineering, and in particular relates to a device for converting the longitudinal vibration of a drill string into the torsional impact of a drill bit, which is applied in oil and natural gas drilling operations. Background technique [0002] Modern energy development strategies have higher and higher requirements on drilling speed and quality. When drilling into deep highly abrasive formations, the main drill bit that improves drilling efficiency by changing rock-breaking efficiency and saving tripping time—the PDC bit has serious "stick-slip" (stick-slip) vibration when drilling This phenomenon makes the drilling string components and downhole tool combinations suffer from severe stress conditions and low fatigue life, which limits or even hinders the further development of deep wells and ultra-deep wells. [0003] During the drilling process, due to the stick-slip phenomenon, the failure of the drilli...

AI Technical Summary

Problems solved by technology

[0005] The vibration phenomenon of the drill string is a complex situation often encountered in vertical well drilling, and the longitudinal vibration of the drill string vibration is the most obvious and frequent vibration form. It not only affects the efficiency of drilling construction, but also causes drill string vibration. Accidents such as fracture and damage have affected the progress of drilling operations

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