Near-bit torsion impactor

Abstract

The invention discloses a near-bit torsion impactor. The near-bit torsion impactor comprises a drill collar pup joint, a splitter, a torsion impactor body and an impact transmission pup joint. The lower portion of the drill collar pup joint is connected with the impact transmission pup joint, the splitter and the torsion impactor body are installed between the drill collar pup joint and the impact transmission pup joint; a lower port of the splitter is communicated with an inlet of the torsion impactor body; an outlet of the torque impactor body is communicated with the transmission pup joint. The near-bit torsion impactor has the advantages that due to the fact that high-frequency low-amplitude torque impact which is stable in periodicity is generated, impact torque can eliminate the phenomena of PDC bit stick slip and intermittent bit sticking; due to the fact that the near-bit torsion impactor is provided with no electronic part and is of a full-hydraulic mechanical structure, the size is small and the impact process has no interference to an electric instrument which conducts measurement while drilling. The near-bit torsion impactor guarantees that in the drilling process, torque in a drill stem is stable and balanced, drill stem torsion oscillation is reduced and stable work of electric MWD devices, electric LWD devices and the like is facilitated. Parts which are prone to being damaged are few in the near-bit torsion impactor, and the near-bit torsion impactor is stable in work, long in service life and beneficial for lowering well drilling cost.

Description

technical field [0001] The invention relates to an auxiliary rock-breaking tool used in the field of oil and natural gas drilling technology, in particular to a torsional impactor near a drill bit. Background technique [0002] In deep or ultra-deep formations, the rock hardness is high, the drillability level is high, the ROP is slow, and the drilling cost is high. When the PDC bit drills into these formations, it will produce stick-slip effect and intermittent sticking phenomenon. This phenomenon occurs because the teeth of the PDC drill bit accumulate a certain amount of torsional energy when breaking the rock. When the rock under the PDC bit teeth is broken, the torsional impact energy in the drill string is released quickly. This phenomenon makes the drill string produce torsional vibration, which makes the rock-breaking process of the PDC bit extremely unstable, causing damage to the PDC bit and reducing the life of the bit. [0003] In order to solve the problems of...

AI Technical Summary

Problems solved by technology

This phenomenon causes torsional vibration of the drill string, making the rock-breaking process of the PDC bit extremely unstable, resulting in damage to the PDC bit and reducing the life of the bit

[0003] In order to solve the problems of stick-slip effect and intermittent sticking of the PDC bit, increase the stability of the PDC bit, and prolong the service life of the bit, the patent US6742609B2 designed a torsional impactor driven by a drilling fluid turbine, and the patent 200910058083.9 designed a The torsional percussion drilling tool driven by a drilling fluid screw drilling tool, but these two drilling tools have complex structures, many vulnerable parts, large pressure loss, and limited service life.

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