Reciprocating percussive-rotary drilling tool

Abstract

The invention discloses a percussive-rotary drilling tool which is used for providing reciprocating percussion and torque simultaneously during well drilling and can improve drilling efficiency and mechanical drilling rate, and reduce drilling cost. The technical scheme is that: a flow controller is arranged in an upper joint and an automatic valve device below the flow controller is connected with an inner hole of the upper joint through a thread; the automatic valve device, a shell, and an upper end face of a central spindle form a cavity with a variable volume; a flow channel is formed in the middle of the central spindle; a sealing member is arranged between an outer wall of the upper end of the central spindle and an inner wall of the shell; a thread of the lower part of the central spindle is used for connecting a drill bit; and a rotation device is provided with a spiral groove, cylinder followers of the rotation device are arranged on the central spindle, and the bottom of the rotation device is provided with an unidirectional lower pawl surface which is matched with an unidirectional upper pawl surface on the upper part of a bearing joint. The percussive-rotary drilling tool has a simple structure, is suitable for well repairing and drilling operation, and can provide torque and percussion energy, reduce the phenomenon that the drilling bit is sticky and slippery, accelerate mechanical drilling rate, improve drilling efficiency and reduce drilling cost.

Description

technical field [0001] The invention relates to a rotary percussion drilling tool capable of simultaneously providing reciprocating impact and torque during drilling, which is suitable for oil and gas drilling engineering and workover services, and can also be used for geological exploration hole drilling engineering. Background technique [0002] At present, most of the drilling tools used in oil fields can only provide axial impact force or circumferential torque. For hard formations or abrasive formations, when the drilling tools only provide axial impact force, the penetration depth of the drill bit is not enough. , the ROP needs to be improved; and when the drilling tool only provides circumferential torque, it often lacks enough torque to destroy the formation, so that the drill bit stops rotating instantly, and stick-slip and sticking occur. At this time, the drill string will be like clockwork. The same tightening, the torque is accumulated and released quickly, resu...

AI Technical Summary

Problems solved by technology

[0002] At present, most of the drilling tools used in oil fields can only provide axial impact force or circumferential torque. For hard formations or abrasive formations, when the drilling tools only provide axial impact force, the penetration depth of the drill bit is not enough. , the ROP needs to be improved; and when the drilling tool only provides circumferential torque, it often lacks enough torque to destroy the formation, so that the drill bit stops rotating instantly, and stick-slip and sticking occur. At this time, the drill string will be like clockwork. The same tightening, the torque is accumulated and released quickly, resulting in torsional vibration of the drill string, and at the same time, the drill bit will also be subject to higher impact loads, which will adversely affect the service life of the drill bit and drill string accessories.

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