Screw drilling tool is an energy positive displacement power conversion device that converts the pressure energy of liquid into mechanical energy. It is mainly composed of screw motor (stator, rotor) assembly, cardan shaft assembly, and drive shaft assembly.
The screw drilling tool is used for drilling without the rotation of the drill pipe. The flushing fluid output from the mud pump enters the screw motor, forming a certain pressure difference at the inlet and outlet of the motor, driving the motor rotor to rotate, and transmitting the speed and torque through the universal shaft and the transmission shaft To the drill bit, so as to achieve the purpose of crushing rock.
Screw drilling tools can perform directional drilling mainly for three reasons:
When the 1. screw drilling tool works, the drill bit rotates to break the rock, while the outer pipe of the screw and the drill string do not rotate;
2. can be connected with different angles of directional or adjustable curved outer tube;
Inclination and azimuth measurements can 3. be made while drilling.
