ZH

The Downhole Motor-Drilling Motor is a volumetric downhole power drilling tool that uses the drilling fluid as the power and converts the liquid pressure energy into mechanical energy. When the mud pumped by the mud pump enters the Downhole Motor-Drilling 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 rotational speed and torque to the drill bit through the universal joint shaft and the drive shaft. , so as to realize the drilling operation.

The utility model relates to a progressive cavity type positive displacement hole bottom power machine, referred to as a Downhole Motor-Drilling Motor for short. The Downhole Motor-Drilling Motor, which uses mud and water as the power medium and is transported to the bottom of the hole through the center hole of the drill pipe, is essentially an energy conversion device that converts liquid pressure energy into mechanical energy. During drilling, the Downhole Motor-Drilling Motor directly drives the core tube and the drill bit connected to the drive shaft at the bottom of the hole to rotate. The entire drill string is only used as a channel for conveying high-pressure working medium and a rod supporting the counter torque of the drill bit, and does not rotate. Compared with conventional drilling, Downhole Motor-Drilling Motor has many advantages, such as greatly reduced drill pipe wear and high ROP. It is the main tool for making directional holes and has played a role in the field of drilling.

The Downhole Motor-Drilling Motor consists of four parts: Bypass Valve, Motor, Cardan Shaft and Drive Shaft.

The Downhole Motor-Drilling Motor is the main part of the drilling tool. Many practical and theoretical analysis results show that if the motor is to work normally and effectively, the pressure drop that each stage of the motor can withstand should not exceed 0.8Mpa, otherwise the motor will leak. The speed decreases quickly, and in severe cases, it stops rotating completely and the motor is damaged. (One lead of the motor is one stage) The mud flow used in the field should be within the recommended range of use, otherwise it will affect the motor efficiency and even increase the wear and tear. The performance parameters of the Downhole Motor-Drilling Motor are the main performance parameters of the Downhole Motor-Drilling Motor. The theoretical output torque of the motor is proportional to the pressure drop of the motor, and the output revolution is proportional to the input mud flow. With the increase of the load, the revolution of the drilling tool decreases, so as long as you control the reading of the pressure gauge on the ground and the flow rate of the pump, you can Control the torque and rotational speed of downhole drilling tools.