The structural composition of mud power drilling motor mainly includes: stator, rotor, bearing, transmission parts (including elbow joint), ultrasonic instrument, etc.
Among them, the stator is formed by injecting rubber bushings on the inner wall of the steel pipe, and its inner hole is a helix with certain geometric parameters; the rotor is a screw with a hard layer, and the rotor and the stator are meshed with each other, and the lead difference between the two is used. A spiral sealed cavity is formed to complete energy conversion. The helix of the motor rotor can be divided into single-head and multi-head. The fewer the number of rotors, the higher the speed and the smaller the torque; the more the number of heads, the lower the speed and the greater the torque.
In addition, the mud power drilling motor also needs to be equipped with transmission parts and ultrasonic instruments to realize the functions of steering and positioning.
In short, the structure of the mud dynamic drilling motor is very complicated and needs to be composed of multiple components. These components play different roles during the operation of the motor, and jointly ensure the efficient and reliable operation of the motor.