Magnetorheological fluid torsion damping device and method for rotary steering

By using a magnetorheological fluid torsional vibration damping device to monitor and adjust the damping force in real time, the problem of torque fluctuation in the rotary guide system was solved, achieving effective vibration reduction and protection under different working conditions.

CN122328009AActive Publication Date: 2026-07-03CHINA UNIV OF PETROLEUM (EAST CHINA)
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Patent Information

Application Number
CN202610797246.9
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-06-04
Publication Date
2026-07-03
Estimated Expiration
2046-06-04

AI Technical Summary

Technical Problem

During drilling, existing rotary steering systems experience severe torque fluctuations. Existing torsional dampers cannot adaptively adjust to complex downhole conditions, resulting in unnecessary resistance during stable drilling phases or insufficient damping during severe vibrations, thus failing to effectively protect the equipment.

Method used

A magnetorheological fluid torsional vibration damping device is adopted. The vibration state is monitored in real time by a triaxial accelerometer and a gyroscope. The damping force of the inertial damping unit is adjusted by using an electromagnetic coil to adjust the viscosity of the magnetorheological fluid, thereby achieving active vibration reduction.

Benefits of technology

It enables real-time adjustment of damping force according to downhole conditions, saving energy during smooth drilling and providing effective protection during severe vibrations, thereby improving the stability and safety of drilling equipment.

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Abstract

The invention discloses a magnetorheological fluid torsion damping device and method for rotary steering, and belongs to the technical field of drilling engineering, the magnetorheological fluid torsion damping device comprises a shell and a center shaft, and a damping cavity is formed between the inner wall surface of the shell and the outer wall surface of the center shaft; the damping cavity is filled with magnetorheological fluid; an inertia damping unit is arranged in the vibration reduction cavity, the inertia damping unit comprises a gear bearing and an electromagnetic damping mechanism, and the electromagnetic damping mechanism comprises an electromagnetic coil, a magnetic conductive outer ring and a magnetic conductive inner ring; an annular groove is formed in the position, right opposite to the gear bearing, of the outer wall face of the shell, the electromagnetic coil is embedded into the annular groove, and the magnetic conductive outer ring is fixed into the annular groove. A magnetic conductive inner ring is embedded into the inner wall surface of the central shaft in a position opposite to the gear bearing; the central shaft is provided with a shaft acceleration sensor and a gyroscope. By acquiring the vibration intensity and the stick-slip vibration index at the current sampling moment, the magnitude of the current in the electromagnetic coil is changed in real time, and then the damping force of the inertia damping unit is adjusted by adjusting the viscosity of the magnetorheological fluid.
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