Method for improving shock absorption effect and stability of downhole drilling tool and downhole drilling tool

Abstract

The invention discloses a method for improving the shock absorption effect and stability of a downhole drilling tool and the downhole drilling tool. The method is characterized in that a hydraulic shock absorber is arranged between a lower connector and a spindle, to eliminate or relieve the up-and-down vibration caused by bit jumping; stabilizers are arranged on the outside of the hydraulic shock absorber and on the lower connector, to prevent borehole deflection caused by lateral displacements of the drilling tool. According to the invention, by improving the structure of the downhole drilling tool, the two-way hydraulic shock absorber, the drill string stabilizer and the near-bit stabilizer are integrated to one drilling tool ingeniously, the structure of the drilling tool is simplified, bit jumping and vibration are overcome, and a near-bit drill string can be guaranteed to be kept stably in the middle under the effects of torque and bending moment. In the drilling process, the drilling speed and the quality of a well bore can be improved, and the drilling cost can be reduced. By applying the method for improving the shock absorption effect and stability of the downhole drilling tool and the downhole drilling tool, damage to the drilling equipment caused by the vibration can be effectively avoided or reduced, instability caused by the bending moment of the drill string can be overcome, the service life of a bit is greatly prolonged, the quality of the well bore is guaranteed, the drilling speed is improved, and the drilling cost is lowered.

Description

technical field [0001] The invention relates to a method for improving the vibration reduction effect and stability of a downhole drilling tool and the downhole drilling tool, belonging to the technical field of drilling tools. Background technique [0002] In the oil, natural gas and geological exploration drilling process, the main reasons for the damage of the drill string and drill bit are as follows; one is that the drill string and the drill bit frequently jump and vibrate up and down, so that the drill pipe loses its pure tensile working state and is in tension. , Pressure alternating stress state, causing drill pipe breakage or reducing service life. Substantial drill jumping and vibration may even damage the well platform equipment. Destroy the best working environment of the drill bit, cause the teeth of the drill bit to fall off or break off, and reduce the service life of the drill bit. Second, under the combined action of the upper rotation torque and the bott...

AI Technical Summary

Problems solved by technology

Destroying the best working environment of the drill bit, causing the teeth of the drill bit to fall off or break off, reducing the service life of the drill bit

Second, under the combined action of the upper rotation torque and the bottom hole reaction torque, the drill string and the drill bit will have a large torque change, which is manifested as pulse rotation, which will reduce the service life of the drill pipe, and seriously cause the drill pipe to twist. Downhole accidents; or cause the drill bit teeth torsion impact breakage, reducing the service life of the drill bit

[0004]Since the best installation position for these two tools to play the most effective role is near the drill bit, the existing technology is two tools, in fact there can only be one tool Optimum position, so existing drill tool assemblies are not optimal for damping and stabilizing

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