Downhole Motor(PDM drill) is a volumetric downhole power drilling tool that uses drilling fluid as power and converts liquid pressure energy into mechanical energy. When the mud pumped by the mud pump flows into the motor through the bypass valve, a certain pressure difference is formed at the inlet and outlet of the motor, which pushes the rotor to rotate around the axis of the stator, and transmits the speed and torque to the drill bit through the universal shaft and the transmission shaft To achieve drilling operations.

component:

    The Drilling Motor is mainly composed of four major assemblies: bypass valve, hydraulic motor, universal shaft and transmission shaft. The screw motor is the main component of the drilling tool. Many practical and theoretical analysis results show that if you want to make the motor work normally and effectively, the pressure drop that each motor can withstand should not exceed 0.8Mpa, otherwise the motor will be lost. The rotation speed decreases quickly, and in severe cases it stops completely and the motor is damaged.

    One lead of the motor is one level, and the mud flow used on site should be within the recommended range of use, otherwise it will affect the efficiency of the motor and even increase wear. The performance parameters of the screw motor are the main performance parameters of the screw drilling tool. The theoretical output torque of the motor is proportional to the motor pressure drop, and the output rotation speed is proportional to the input mud flow. As the load increases, the drill rotation speed decreases, so as long as the reading of the pressure gauge on the surface and the flow rate of the pump can be controlled Control the torque and speed of downhole drilling tools.