A coiled tubing downhole tool to prevent sloughing

CN121675771BActive Publication Date: 2026-07-03NORTHEAST GASOLINEEUM UNIV +1

Patent Information

Authority / Receiving Office: CN · China
Patent Type: Patents(China)
Current Assignee / Owner: NORTHEAST GASOLINEEUM UNIV
Filing Date: 2026-02-02
Publication Date: 2026-07-03

AI Technical Summary

Technical Problem

In deep-sea drilling, the joint between coiled tubing and downhole tools is prone to detachment due to tensile forces, and existing threaded connection methods cannot effectively withstand large tensile forces.

Method used

It adopts an annular toothed groove and a single toothed ring structure, combined with an internally threaded drive sleeve and a moving sleeve with opposite directions of rotation. By rotating the drive sleeve, the bearing is forced to compress the outer diameter of the single toothed ring to shrink, maintaining engagement with the annular toothed groove. It utilizes the elastic deformation characteristics of tubular objects to bear tensile force.

Benefits of technology

This effectively avoids the problem of downhole tools falling off due to a decrease in load-bearing capacity, and improves the connection stability and safety of coiled tubing in deep-sea drilling.

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Figure CN121675771B_ABST

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Abstract

A coiled tubing downhole tool designed to prevent detachment relates to the field of subsea oil and gas production equipment technology. A single-toothed ring is fitted around the outer sides of annular grooves B and A. The single-toothed ring is a semi-circular ring, composed of an outer rectangular ring and an inner toothed ring. The tooth shape of the toothed ring is the same triangular tooth shape as that of annular grooves B and A. The beneficial effects of this invention are: by setting a semi-circular single-toothed ring, the inner diameter of the female thread can be reduced. Utilizing the characteristic of a tubular object stretching and elastically lengthening while its diameter decreases, a drive sleeve with two internal threads of opposite directions is set. During this change, rotation drives the moving sleeve and the bearing to compress the outer diameter of the single-toothed ring, maintaining complete engagement between the single-toothed ring and annular grooves A and B. Simultaneously, the width of the single-toothed ring increases after deformation, allowing it to still bear the full tensile load, avoiding the problem of reduced tensile load and tool detachment that occurs with ordinary threaded connections.

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