High-frequency circumferential impact type screw drilling tool structure

Abstract

The invention provides a high-frequency circumferential impact type screw drilling tool structure. The structure comprises a bypass valve assembly, an anti-fall assembly, a motor assembly, a universalshaft assembly, a transmission shaft assembly and a circumferential impact assembly which are connected in sequence. The high-frequency circumferential impact type screw drilling tool structure has the beneficial effects that the high-frequency circumferential impact type screw drilling tool structure cooperates with a PDC drill bit to be used together, the phenomenon that one or more vibrations(in the transverse, longitudinal and torsional direction) and clamping slip occur during downhole drill bit motion is eliminated, and the torque of a whole drill column keeps stable and is transmittedto the drill bit in a balanced mode; and according to the rock breaking mechanism, impact breaking is mainly conducted, a rock layer is subjected to high-frequency rotational shear, accordingly, quick and smooth drilling is achieved, the well drilling efficiency is improved, and the well drilling cost is reduced.

Description

technical field

[0001] The invention relates to the field of drilling tools for oil and natural gas exploitation, and more specifically relates to a high-frequency circumferential impact screw drilling tool structure. Background technique

[0002] At present, the simple drill string or screw drilling tool assembly only provides power to the drill bit, which cannot keep the torque of the entire drill string stable and balanced, and cannot transmit the power to the drill bit evenly and stably, while the movement of the PDC bit is extremely disordered. Including transverse, longitudinal and torsional vibrations and combinations of these vibrations. Downhole vibration will damage a single PDC cutter, resulting in reduced bit life, causing torque fluctuations to interfere with directional control and logging-while-drilling (LWD) signals, and producing irregular boreholes that reduce wellbore quality, thereby greatly reducing ROP and improving drilling cost. Contents of the inv...

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