Cam type high-frequency percussion well drilling tool

Abstract

The invention relates to a cam type high-frequency percussion well drilling tool which is characterized by comprising a screw assembly and an axial vibration assembly. The screw assembly comprises a sealed chamber, a mandrel and a lower connector, the axial vibration assembly comprises an upper cam, a lower cam, a disc spring, a suspension nut and a thrust bearing, the disc spring, the suspension nut and the thrust bearing are sleeved on the outside of the mandrel, the suspension nut is connected with the lower connector in a threaded manner, and an upper sealing sleeve is arranged between the sealed chamber and the mandrel; a floating piston is sleeved between the sealed chamber and the lower connector, the floating piston, the upper sealing sleeve, the mandrel, a first sealing sleeve and the sealed chamber form a closed cavity, and hydraulic oil can be filled in the closed cavity. The cam type high-frequency percussion well drilling tool has the advantages that high-frequency, uniform and stable mechanical percussion energy can be generated by the tool in a well drilling procedure, so that a drill bit can constantly keep continuously cutting a well bottom at a high frequency, the shearing efficiency is improved, and one or a plurality of types of possible harmful vibration and a possible stick-slip phenomenon are prevented when the drill bit moves; axial runout, transverse vertex motion and the stick-slip phenomenon in the well drilling procedure can be prevented, the well drilling mechanical rotation speed further can be increased, and the service life of the well drilling tool is prolonged.

Description

technical field [0001] The invention belongs to the technical field of oil and gas drilling and completion, in particular to a cam-type high-frequency percussion drilling tool. Background technique [0002] At present, a single rotary drilling technology is commonly used in conventional drilling operations. The movement of the PDC bit is extremely disordered, including lateral, longitudinal, and torsional vibrations and combinations of these vibrations, and downhole vibrations will damage the cutting of a single PDC. This not only shortens the service life of the drill bit and affects the safety of the drilling tool, but also leads to low drilling speed of drilling machinery, slow footage, and stress fatigue of the drilling tool in advance. In addition, torque fluctuations can interfere with directional control and logging-while-drilling (LWD) signals, as well as create irregular boreholes that degrade wellbore quality. Therefore, the traditional rotary drilling technology ...

AI Technical Summary

Problems solved by technology

[0002] At present, a single rotary drilling technology is commonly used in conventional drilling operations. The movement of the PDC bit is extremely disordered, including lateral, longitudinal, and torsional vibrations and combinations of these vibrations, and downhole vibrations will damage the cutting of a single PDC. This not only shortens the service life of the drill bit and affects the safety of the drilling tool, but also leads to low drilling speed of drilling machinery, slow footage, and stress fatigue of the drilling tool in advance, etc.

In addition, torque fluctuations can interfere with directional control and logging while drilling (LWD) signals, as well as create irregular boreholes that reduce wellbore quality

Therefore, the traditional rotary drilling technology has been unable to meet the drilling time-efficiency requirements of deep formations with poor drillability such as soft-hard formations and hard formations.

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