Magnetorheological intelligent drilling vibration damper

Abstract

The invention relates to a special downhole tool for oil, natural gas and geology drilling, in particular to a magnetorheological intelligent drilling vibration damper. The magnetorheological intelligent drilling vibration damper comprises a turbine generator module, a sensing controller module, a magnetorheological valve, a spring group and a torsion bearing, wherein the turbine generator module, the sensing controller module, the magnetorheological valve, the spring group and the torsion bearing are sequentially connected; the sensing controller module is internally provided with a sensing controller; the magnetorheological valve is internally provided with a coil mandrel; a magnet exciting coil is wound in an annular groove positioned on the a coil mandrel; the coil mandrel, a compensating piston, a coil mandrel lining and a valve sleeve form an upper cavity and a lower cavity together; magnetorheological fluids are sealed in the upper cavity and the lower cavity and flow between the upper cavity and the lower cavity through a damping channel; the torsion bearing is internally provided with a bearing ball raceway; and a bearing ball is arranged in the bearing ball raceway. The invention has the advantages of capability of real-time control, good vibration damping effect, and capabilities of prolonging the service life of the bit and enhancing the drilling speed.

Description

technical field [0001] The invention relates to a special downhole tool used in petroleum, natural gas and geological drilling, and a magnetorheological intelligent drilling shock absorber. Background technique [0002] Oil, natural gas, and geological drilling often encounter some hard rock formations. Due to the uneven bottom of the well, the intermittent pressing of the drill bit teeth into the rock and the intermittent breaking of the rock, and the whirl of the drill string around the center of the wellbore, the drill string will vibrate longitudinally, transversely, etc. vibration and torsional vibration. When the longitudinal vibration frequency of the drill bit coincides with the natural frequency of the drill tool, drill jumping occurs. When jumping, the drill bit leaves the rock at the bottom of the well and drives the drilling tool to move upward together, and then falls to the bottom of the well from the highest point together, resulting in a relatively destructi...

AI Technical Summary

Problems solved by technology

Used outside of these conditions, the damper will be less effective and in some cases even increase drill string vibration

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