A dynamic switching device for drilling mode for coiled tubing drilling

By designing a dynamic drilling mode switching device for coiled tubing drilling, the problem of unstable switching of direction and reversal in coiled tubing drilling is solved, flexible switching of downhole drilling modes is achieved, and operational efficiency and the service life of the coiled tubing are improved.

CN119777730BActive Publication Date: 2025-09-30CHINA NAT PETROLEUM CORP +2
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Patent Information

Application Number
CN202311294904.5
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-10-08
Publication Date
2025-09-30
Estimated Expiration
2043-10-08

AI Technical Summary

Technical Problem

Coiled tubing drilling cannot achieve stable switching between directional and reversible drilling in the wellbore, resulting in frequent replacement of screw drilling tools, increasing operating costs and cycles, and shortening the service life of the coiled tubing.

Method used

A dynamic switching device for coiled tubing drilling is designed. It includes a first screw motor, an automatic on/off switch, a clutch, an electronically controlled directional control, and an angle sensor. By monitoring the rotational position and angle of the coiled tubing, it achieves dynamic switching between downhole directional drilling and steady-angle drilling.

Benefits of technology

It realizes the flexible switching of downhole drilling modes of coiled tubing drilling, reduces the number of drilling trips, improves operation efficiency, extends the life of coiled tubing, and enhances the control capability of complex wellbore trajectories.

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Abstract

The present invention relates to the field of coiled tubing drilling control equipment, specifically disclosing a dynamic drilling mode switching device for coiled tubing drilling. The device comprises a first screw motor, one end of the first screw motor's rotor connected to the coiled tubing and the other end connected to one end of a clutch. The other end is equipped with a detection element for monitoring the rotational position of the coiled tubing. An automatic on / off switch is connected to the first screw motor's fluid inlet channel, controlling the closing or opening of the channel. The other end of the clutch is connected to an electrically controlled directional control via an input shaft, and the other end of the clutch is controlled by the drive closing end of the automatic on / off switch. The electrically controlled directional control adjusts the rotational angle of the input shaft, and the clutch controls the connection and disconnection of the torque transmitted from the input shaft to the rotor of the first screw motor. This device can address the problem of stable switching between directional and reversing drilling in coiled tubing drilling.
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