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directional drilling mud motor,
positive displacement mud motor
Downhole Motor Parts, Chrome Plated Rotor, Lobes Rotor, Alloy Steel Rotor
The power assembly consists of the rotor and the stator and converts hydraulic power to mechanical power to turn the drill bit. A series of cavities is formed wherever the rotor and stator touch.
The rotor is a bar made of alloy steel with one or more lobes along it. The standard rotor is chrome-plated to reduce friction, but other coatings are also available, depending on the specific application for which the downhole mud motor will be used.
In the power section, the spiral shaped rotor produces rotation when the drilling fluid force acts upon it. Should the bit/formation resistance to rotation (known as the drilling torque requirement) be too great, then the drilling fluid can potentially cause the elastomeric material of the stator to become deformed temporarily. The division or seal between high and low pressure is then lost, which causes the motor to stall. As the pressure inside each cavity decreases from leakage of fluid volume past the lost seal, there will be a significant pressure increase at the surface. This means that the motor needs to be lifted off the bottom, and then restarted. Should the stall not be properly corrected, the stator will be permanently damaged, and the life of the overall motor reduced. This is especially important when working with higher flow rates or high differential pressures. Less applied differential pressure will mean fewer stalls.
The stator will have one lobe more than the rotor, forming a series of sealed cavities through which drilling fluid flows to create pressure which creates power. A variety of different elastomers are available, depending on the specific application for which the motor will be used.
Tiptop motors can be made available with various speed ranges by altering stage and lobe ratio between the rotor and stator.
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