Transmission shaft overturning prevention positive displacement motor with overload protection

Abstract

The invention relates to the technical field of positive displacement motors, in particular to a transmission shaft overturning prevention positive displacement motor with overload protection. The positive displacement motor comprises a bypass valve assembly, an anti-falling assembly, an overload protection motor assembly, a universal shaft assembly and an anti-overturning transmission shaft assembly which are connected in sequence. The overload protection motor assembly comprises a stator, a hollow rotor and a high-pressure one-way overflow valve, the hollow rotor is assembled into the stator, and the high-pressure one-way overflow valve is installed inside the hollow rotor; the anti-overturning transmission shaft assembly comprises an upper radial bearing set, a transmission shaft shell,a thrust bearing set, a transmission shaft anti-falling mechanism, a transmission shaft anti-overturning mechanism, a lower radial bearing set and a transmission shaft. By adopting the one-way high-pressure overflow valve structure, the transmission mechanism of the positive displacement motor is safer and more reliable; by adopting the anti-overturning transmission shaft assembly, the phenomenonthat the transmission shaft overturns relative to the body due to the fact that rotation of a drill bit is clamped in the using process of the positive displacement motor is avoided, and therefore the risk caused by clamping of bricks is lowered.

Description

technical field [0001] The invention relates to the technical field of screw drilling tools, in particular to a screw drilling tool with overload protection to prevent reverse rotation of a drive shaft. Background technique [0002] Screw drilling tool is the most commonly used downhole power tool at present, mainly used for deflection and torsion azimuth construction in directional wells and horizontal wells, and also partly used in vertical well operations or sidetracking operations. The screw drilling tool is a volumetric downhole power tool that uses drilling fluid as the power to convert the pressure energy of the drilling fluid into mechanical energy. During the working process, a certain pressure difference is formed between the inlet and outlet of the drilling tool motor to push the rotor in the stator cavity. With planetary motion, the revolution of the rotor is converted into the conical swing of the cardan shaft, and the self-propagation of the rotor is transmitte...

AI Technical Summary

Problems solved by technology

In the limit state, it may cause the drill bit to brake. The breakdown pressure of the motor is very high in the early stage of use, and the pressure difference between the inlet and outlet of the motor will be very large, so that the cardan shaft and the transmission shaft will bear a large torque, resulting in the cardan shaft or The transmission shaft fails; when the wear and breakdown pressure of the motor is not high at the end of use, when the drill bit encounters a lot of resistance, the speed of the drill bit may be lower than the speed of the turntable or the top drive or even the speed is zero, and the bit stuck. other risk

Both of the above situations will cause the screw drilling tool to fail and cannot work normally

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