Torsional impact drilling tool

Abstract

The invention discloses a torsional impact drilling tool which can apply high-frequency torsion impact to a drilling bit in the drilling engineering. The technical scheme of the torsional impact drilling tool is as follows: the torsional impact drilling tool mainly comprises a short section of a drill collar, a torsional impact generator and a connecting body, wherein the short section of the drill collar and the torsional impact generator are in clearance connection through the connecting body and are located by splines; a diversion cover is fixed on a hammer seat; a cavity is formed inside the diversion cover; a closure nozzle, a sieve tube, a locating sleeve and an impact hammer are sequentially arranged in the cavity from inside to outside; the sieve tube is fixed with the hammer seat; the impact hammer, the locating sleeve, the sieve tube and the hammer seat are provided with through holes in the circumferential direction; and an impact hammer head and a starting hammer head are processed on the impact hammer. The torsional impact drilling tool is arranged between the drill collar and the drilling bit; and the drilling bit receives the high-frequency torsional impact generated by the impact hammer under the driving of fluids while receiving the rotational torsion of a drill column. Compared with other drilling tools, the torsional impact drilling tool disclosed by the invention has the advantages that the high-frequency torsional impact can be generated, the sticking-sliding phenomenon of the drilling bit is eliminated, the mechanical drilling rate of harder or abrasive formation is increased, the service life of matched components, such as the drilling bit and the like of the drill column is prolonged, the drilling efficiency is improved and the drilling cost is reduced.

Description

technical field [0001] The invention relates to the field of downhole tools in drilling engineering. technical background [0002] The drill bit has the following problems during use: [0003] (1) During the drilling process, the drill bit usually has the phenomenon of stick-slip and drill sticking. The drill string is always tightened like a clockwork, and is released quickly after the torque is accumulated. This kind of engineering problem is more serious. The drill string torsional vibration makes the The entire drilling process is unstable, which has an adverse effect on the service life of the drill bit and drill string supporting components. [0004] (2) For hard formations or abrasive formations, the penetration depth of the drill bit is not enough, and the ROP needs to be improved. [0005] At present, all kinds of rotary punching or punching rotary tools used in drilling operations can only produce axial impact force, which will not solve the phenomenon of stick-s...

AI Technical Summary

Problems solved by technology

[0003] (1) During the drilling process, the drill bit usually has the phenomenon of stick-slip and drill sticking. The drill string is always tightened like a clockwork, and is released quickly after the torque is accumulated. This kind of engineering problem is more serious. The drill string torsional vibration makes the The entire drilling process is unstable, which adversely affects the service life of the drill bit and drill string accessories

[0004] (2) For hard formations or abrasive formations, the penetration depth of the drill bit is not enough, and the ROP needs to be improved

The TorkBuster torsional impact generator in the United States (patent number: US 6742609B2) uses a turbine-driven impact hammer to generate high-frequency torsional impact, and the torsional impact drilling tool of Southwest Petroleum University (patent application number: 200910058083.9) uses a screw drill to drive an impact hammer. A variety of drilling tools have many wearing parts and consume a large pressure drop

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