Downhole Motor Power Section, High Precision Elastomer Stator and Rotor
The power section assembly consists of stator and rotor. Stator is made by squeezing rubber sleeve on the wall of steel tube. There forms spiral structure with a certain geometric parameter. Rotor is a chrome-plated screw rod.
Stator and rotor matches with each other, to form spiral line and seal cavity through their guide rail difference. With rotor running in the stator, the seal cavity is moving along its axial direction, continuously forms and disappears to complete its energy conversion. This is the basic principle of downhole mud motor.
Our advanced instruments and equipment, excellent process and special surface treatment technology has effectively ensured machining precision. Flow area is effectively increased by 10%~20% and rotational speed is improved. Working pressure drop is reduced and the working pumping pressure is reduced accordingly, improving the drilling safety performance. Optimal selection of raw material and improved formula ensure high quality rubbers, available fro different drilling environments.
A guide rail forms a seal cavity in motor stator. This is called one stage. When the rated working pressure of each stage lows down to 0.8MPa, the maximum pressure loss will be 1.3 times of the rated pressure. As the pressure loss is over the due value, motor may bring about leakage and speed will quickly slow down. More seriously, it may cause operation into complete stop, even cause the motor to be damaged.
In order to ensure rotor seal in good condition, the matching size between rotor and stator relates closely to depth temperature. Therefore, correct downhole temperature shall be provided for reliable selection of appropriate motor. The actual mud flow rate is required in the recommended range. Otherwise incorrect flow rate may affect the motor efficiency, even cause speeding up motor wear.
Motor torque is proportional to its pressure loss, but its outlet speed is inversely proportional to mud flow rate. With load increasing, downhole mud motor speed decreases. Thus, pressure shall be controlled by the pressure gauge and flow rate shall be controlled by the flow rate gauge on surface. This way may control both torque and speed of downhole mud motor.
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High Precision Directional Drilling Motor , Alloy Steel Mud Motor Power Section Images
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