Bottomhole drilling tool and its anti-falling self-locking structure

Abstract

The invention provides a downhole drilling tool and an anti-loosening self-locking structure thereof. The anti-loosening self-locking structure of the downhole drilling tool comprises a mandrel of a downhole drilling tool, the mandrel is connected with a casing of the downhole drilling tool in a pivotable manner via a bearing and a bearing seat, the bearing seat is connected with the casing via a first screw thread pair, the lower end of the mandrel is connected with the upper end of a driving shaft barrel of the downhole drilling tool via a second screw thread pair, and the lower end of the driving shaft barrel is connected with a drill via a third screw thread pair. During working, the threaded connections between the bearing seat and the casing, between the mandrel and the driving shaft barrel and between the driving shaft barrel and the drill become tighter and tighter by screwing along with rotation of the mandrel, so that self-locking function is realized, and loosening accidents can be effectively avoided. In addition, the downhole drilling tool and the anti-loosening self-locking structure thereof are simple in structure and low in cost.

Description

technical field [0001] The invention relates to the field of geology, in particular to a bottom-hole drilling tool and an anti-falling-off self-locking structure thereof. Background technique [0002] Bottomhole drilling tools (such as bottomhole motors, etc.) have the problem of falling off the structure of internal parts, especially when the service life of the whole bottomhole drilling tool is about to come off, the internal parts are particularly easy to fall off. In addition, in the case of deep wells and complex wells, the internal components and shells of bottom-hole drilling tools will bear greater strength in terms of tensile, extrusion, and torsion resistance, which also makes common downhole tools face Risk of falling off. [0003] Parts falling out of the bottom hole drilling tool means an accident, which not only delays the previous progress, but also pays expensive salvage costs. If the salvage fails, the well will be buried. The losses caused by this are imme...

AI Technical Summary

Problems solved by technology

[0002] Bottomhole drilling tools (such as bottomhole motors, etc.) will have the problem of falling off the structure of internal parts, especially when the service life of the entire bottomhole drilling tool is about to come off, the internal parts will be particularly easy to fall off

In addition, in the case of deep wells and complex wells, the internal components and shells of bottom-hole drilling tools will bear greater strength in terms of tensile, extrusion, and torsion resistance, which also makes common downhole tools face danger of shedding

[0003] Parts falling off of the bottom hole drilling tool means an accident, which not only delays the previous progress, but also pays expensive salvage costs. If the salvage fails, the well will be buried. The losses caused by this are immeasurable

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