Screw drilling tool is one of downhole power drilling tools to transform the liquid pressure energy into mechanical energy, it is a drilling fluid as the driving force. When the mud pump pump out the mud enter into the motor, the motor inlet and outlet form a certain pressure difference, to promote the rotor around the axis of the stator rotation, speed and torque through the universal axis and shaft transmission to the drill, in order to achieve drilling operations. Is the most widely used in a downhole power drill.
Mainly used for directional and horizontal wells of the oblique and torsional azimuth construction, often is used with downhole drilling motor, to achieve the purpose of drilling.

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