Power section configuration affects optimum power outputs on mud motor drilling

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Author: 
Atma Yudha Prawira, Budha Maryanti and Etiko Puspo Rini
Subject Area: 
Physical Sciences and Engineering
Abstract: 

Mudmotors are of multi-lobe positive displacement operating on the “Moineau” principal. A drilling fluid commonly referred to as the “mud” is supplied under pressure from a surface source into the tubing during drilling to wellbore. The drilling fluid operates the mud motor (when used) and discharges at the drill bit bottom. The drilling fluid then returns to the surface via the annular space (annulus) between the drill string and the wellbore wall or inside. Fluid returning to the surface carries the rock bits (cuttings) produced by the drill bit as it disintegrates the rock to drill the wellbore. Generally, there are 2 main section on mud motor which are bearing section and power section. The power section generally includes a housing which houses a motor stator within which a motor rotor is rotationally mounted. The power section converts hydraulic energy into rotational energy by reverse application of the Moineau pump principle. The stator has a plurality of helical lobes which define a corresponding number of helical cavities. The rotor has a plurality of lobes which number one fewer than the stator lobes and which define a corresponding plurality of helical cavities. Generally, the greater the number of lobes on the rotor and stator, the greater the torque generated by the motor. Fewer lobes will generate less torque but will permit the rotor to rotate at a higher speed. Based on torque and rotate speed, determine the optimum power can be produced by power section configurations.

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