Configuration of Screw Drill

Screw drill is one kind of downhole drill motor, it makes drilling fluid as a driving force, the fluid pressure energy converted into mechanical energy. Screw drill is made of the bypass valve, screw motor (rotor and stator), universal joints, bearings and drive shaft of several parts, the core part is the screw motor. For screw motor rotor and stator, teeth number of the statorZ1 is more one than the rotor Z2. Design of high-speed screw drill should use screw motor with small gear ratio, designed for low speed high torque of screw drill should use a large number of teeth than the screw motor. With the increase of the number of teeth ratio of rotor-stator, its efficiency tended to decrease; The output torque of screw drill depends on motor pressure, the output speed depends on the flow rate of working medium.