A high-frequency torsional percussion drilling tool

Abstract

The invention relates to a high-frequency torsion impact drilling tool used for drilling engineering in petroleum and gas industries. The problems that hard formation drilling of a deep well and an extra-deep well is difficult, the drilling speed of machinery is low, and well body quality is poor are solved. According to the technical scheme, the upper end of a cardan shaft and the lower end of a screw rotor are connected in a threaded mode, and the lower end of the cardan shaft and the upper end of a rotary valve element are connected in a threaded mode; a thrust bearing is installed on a protruding step of the upper portion of a valve seat inner cavity, and the outer circle of the lower portion of the rotary valve element are in clearance fit; the upper end of a valve shell and the lower end of a cardan shaft shell are connected in a threaded mode, and the lower end of the valve sheel and the middle of a valve seat are connected in a threaded mode; six steel balls are installed in six semi-spherical grooves in the middle of a transmission shell inner cavity and six spiral grooves of a protruding outer circle of the middle of a spiral shaft correspondingly; and the upper end of a lower shaft body and the lower end of a transmission shell are connected in a threaded mode. The high-frequency torsion impact drilling tool can generate high-frequency axial impact vibration, and improves the rock breaking efficiency and mechanical drilling speed of a drill bit. The lower shaft body generates high-frequency micro-amplitude circumferential reciprocating swinging, and can effectively prevent a stick-slip phenomenon.

Description

technical field [0001] The invention relates to a high-frequency torsional percussion drilling tool used in drilling engineering in the petroleum and natural gas industry. Background technique [0002] With the continuous development of drilling technology in the oil and gas industry at home and abroad, the drilling depth continues to increase, and deep wells and ultra-deep wells are used more and more, which has become an inevitable trend in drilling engineering. However, as the well depth continues to increase, the geological conditions become more complex, the formation pressure continues to rise, the strength and hardness of deep formations increase significantly, and the drillability decreases greatly. During the development of deep wells and ultra-deep wells, lateral eddy, gravity accumulation and stick-slip phenomena are often accompanied, which greatly reduces drilling efficiency, damages the quality of wellbore, and causes serious wear and damage to drill bits and d...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a high-frequency torsional percussion drilling tool in order to solve the problems of difficult drilling in deep and ultra-deep wells, low ROP and poor wellbore quality.

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