An oil-carrying rotary connector

By designing the hinge and elastic locking block structure of the coiled tubing rotary connector, the problems of torque stress release and stable locking during high-torque operation in highly deviated and horizontal wells were solved, thereby improving the safety and reliability of coiled tubing operations downhole.

CN122344983APending Publication Date: 2026-07-07SHANDONG JUHUI PETROLEUM TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-06-09
Publication Date
2026-07-07

AI Technical Summary

Technical Problem

Existing coiled tubing connectors cannot effectively release torque stress during the running-in of highly deviated and horizontal wells, and it is difficult to achieve stable locking and sealing under high torque operations, resulting in tubing buckling damage or unstable connection.

Method used

Design an oil-connected rotary connector that allows free rotation during insertion via a lower section of the hinge and an elastic locking block structure, releasing torque stress. When needed, it achieves stable locking through the engagement of the elastic locking block. It employs a magnetic drive reset design or spring drive to automatically release the torque lock.

Benefits of technology

It effectively avoids buckling and fatigue damage to the tubing caused by torque stress downhole, improves the safety and reliability of downhole operations in highly deviated and horizontal wells, and enables free rotation during downhole operation and stable locking during operation.

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Abstract

This invention discloses a rotary connector for coiled tubing, relating to the field of downhole connector technology. It includes an upper connector, one end of which is used to connect to coiled tubing; a rotating ball head, one end of which is connected to the upper connector, and the other end of which is fitted into a ball head seat; a ball head seat with an upper annular groove corresponding to the lower connector, in which an upper gear ring is fixed; and a lower connector, one end of which is rotatably inserted into the ball head seat. When the connector is in a free-rotating state, the torque stress generated by the bending of the wellbore trajectory, tubing buckling, and frictional resistance during the long-distance downhole installation of the coiled tubing string can be released through the free rotation of the connector, effectively preventing stress accumulation and damage to the tubing string. After the operation is completed, the lower section continues to move upward, causing the elastic locking block to retract a second time and pass over the locking ring, separating the lower gear ring from the upper gear ring, thus automatically releasing the torque lock. This achieves the integration of free rotation during installation and stable locking during operation.
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Citation Information

Patent Citations

  • Bi-directional limiting expanding locking type continuous oil pipe combined connector

    CN107288552A

  • Coiled tubing connector

    CN209212173U