Magnet-based torsion percussion boring tool

Abstract

The invention provides a magnet-based torsion percussion boring tool.. The magnet-based torsion percussion boring tool mainly consists of an upper joint, a falling-proof nut, a falling-proof baffle plate, a supporting blocking ring, a casing, a worm wheel, hammer body fixing cavities, percussion hammers, splines, bore bit joints, a fixing cavity baffle plate, magnets, a supporting cylinder, a transmission shaft and a falling-proof pull rod, wherein the casing is connected with the bore bit joints through the splines; the casing is in threaded connection with the upper joint. When the magnet-based torsion percussion boring tool works, drilling fluids drive the worm wheel to rotate, the worm wheel transmits kinetic energy to a lower end hammer body fixing cavity through the transmission shaft, the percussion hammers fixed in the cavities continuously hit a corresponding striking bearing block on the casing during rotating, and percussion energy is transmitted to a bore bit for rock breaking through the bore bit joints. The magnets are used in a percussion assembly of the torsion percussion tool disclosed by the invention, and are fixed to the end surfaces of the inner sides of the percussion hammers. When the percussion hammers hit the striking bearing block, under the effect of percussion force, the hammer bodies can move to the inner side of the fixing cavity, and can be reset by repulsion force of the magnets after percussion is completed. According to the magnet-based torsion percussion boring tool disclosed by the invention, high-frequency torsion percussion force for rock breaking can be formed, and the stick-slip vibration of the bore bit is reduced.

Description

technical field [0001] The invention relates to a downhole percussion drilling tool used in the field of petroleum and natural gas drilling engineering, in particular to a magnetic-based torsional percussion drilling tool. Background technique [0002] In recent years, as the country's demand for oil and natural gas has increased significantly, the development of oil and natural gas has also increased. However, in the process of oil and gas extraction, when encountering hard formations or exploiting the lower formations of ultra-deep wells, the PDC drill bit usually does not have enough torque to destroy the hard formation rocks, so that the drill bit stops rotating instantaneously. The tool still provides torque continuously, so the torque will be accumulated in the drill string. When the torque accumulated in the drill string reaches enough to destroy the rock formation, the torque energy will be released instantly, and the PDC bit will break the rock at a higher speed, re...

AI Technical Summary

Problems solved by technology

[0003] At present, the torsional impactors used in China are mainly imported from abroad. The internal transmission and impact components have complex structures, and the vibration is large during the impact process, resulting in short service life.

If the torsional impactor fails during use, it will again cause the stick-slip vibration of the PDC drill bit

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