Drill tool centralizing pup

Abstract

The invention discloses a drilling tool righting pup joint which comprises a pup joint body, wherein an up-down penetrated drilling fluid channel is formed inside the pup joint body; a plurality of one-way valves used for enabling drilling fluid to flow from the drilling fluid channel to the outside of the pup joint body are uniformly and fixedly arranged on the side wall of the pup joint body in the circumferential direction; the outer side ends of the one-way valves in the radial directions can move telescopically along center shafts of the one-way valves. Direct contact of the drilling tool righting pup joint and a well wall can be reduced by utilization of the drilling fluid, so that friction and torsion can be effectively reduced, and the deviation preventing and straight well drilling performance can be effectively improved.

Description

technical field [0001] The invention relates to the technical field of downhole drilling tools, in particular to a drilling tool straightening nipple capable of reducing wear and torsion. Background technique [0002] In oil drilling operations, especially in deviated wells, horizontal wells and extended-reach wells, due to complex forces such as the interaction between the drill bit and the formation, the drill string of the drilling tool is prone to deflection, which affects the drilling quality. At the same time, due to the deflection of the drill string, it will lean against the lower well wall, and the frictional resistance and circumferential torque between the drill string and the well wall will increase sharply. Stop, which not only reduces the drilling efficiency, but also increases the drilling cost. Therefore, reducing wear, reducing torsion and anti-deviation and straightening are key issues to be solved urgently in drilling operations. [0003] The existing st...

AI Technical Summary

Problems solved by technology

[0003] The existing straightening tools for reducing friction and torsion of drilling tools perform straightening through direct contact with the well wall, and at the same time offset the frictional resistance and torque exerted by the well wall. However, it is impossible to avoid direct contact with the well wall. The drilling tool straightening tool needs to bear the frictional resistance and torque from the well wall

In highly deviated well sections or abrasive formations, the frictional resistance and torque increase sharply, which may easily exceed the performance range of the drill tool straightening tool or cause damage to the drill tool straightening tool, so that the drill tool straightening tool cannot effectively reduce wear The role of torque reduction and righting

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