Axial impact vibration drilling tool with adjustable impact characteristics

Abstract

The invention discloses an axial impact vibration drilling tool with adjustable impact characteristics. The axial impact vibration drilling tool comprises an upper joint, a bypass valve, a screw motor, a shell, a power input shaft, a universal shaft, a centering bearing, an axial vibration generating device and a lower joint, wherein the axial vibration generating device comprises a vibration starting shaft, a ball, a plane bearing, a spring assembly and a cam body. According to the tool, the screw motor is driven by underground drilling fluids, the vibration starting shaft is driven to rotateby the universal shaft, the ball on the step face of the outer side of the middle of the vibration starting shaft moves in a guide groove in the upper end of the cam body, the guide groove is a spacecam type rail, a periodic step height difference exists, and the ball periodically ascends and descends when moving in the guide groove. According to the axial impact vibration drilling tool, drill bit pressurization can be achieved at the bottom of a well, the mechanical drilling speed is increased, the mechanical drilling speed of drilling of a corresponding destination layer can be increased,and impact vibration characteristics can be regulated and controlled in cooperation with rock characteristics of different stratums, so that the optimal rock breaking efficiency is achieved, and the mechanical drilling speed of drilling of the corresponding destination layer is increased.

Description

technical field [0001] The invention belongs to the technical field of oil and gas drilling, and in particular relates to an axial impact vibration drilling tool whose impact characteristics can be modulated. Background technique [0002] With the continuous deepening of oil exploration and development, the drilling depth continues to increase, and the formations encountered become increasingly complex, and the ROP in deep formations is generally low. Therefore, improving the rock-breaking efficiency in deep formations is one of the important ways to increase drilling speed in deep formations and reduce drilling costs. Practice has proved that rotary percussion drilling technology is one of the effective ways to increase the ROP of deep and ultra-deep wells under the existing drilling technology conditions. The development of axial vibration percussion drilling tools can provide additional axial percussion dynamic load for the drill bit, accelerate The rock-breaking efficie...

AI Technical Summary

Problems solved by technology

However, the service life of traditional impact tools is limited during normal work, and the mechanism of the combination of vibration frequency and impact load on the rock-breaking efficiency is not clear. Different impact vibrations should be selected for drilling different target rocks. working parameters in order to achieve optimal rock-breaking efficiency, so the present invention proposes an axial impact vibration drilling tool whose impact characteristics can be modulated. Adjust the shock vibration characteristics of rock characteristics in different formations, so as to achieve the optimal rock-breaking efficiency, improve the drilling speed of the corresponding target formation, shorten the drilling cycle, and reduce the drilling cost

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