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・ Mud Lake Canal
・ Mud Lake Delta Provincial Park
・ Mud Lake Wildlife Management Area
・ Mud Lake, Idaho
・ Mud Lake, Minnesota
・ Mud Lake, Newfoundland and Labrador
・ Mud Life Magazine
・ Mud logging
・ Mud March
・ Mud March (American Civil War)
・ Mud March (Suffragists)
・ Mud Men (TV series)
・ Mud Mills, New York
・ Mud minnow
・ Mud Morganfield
Mud motor
・ Mud Mountain Dam
・ Mud on the Tires
・ Mud on the Tires (song)
・ Mud pebblesnail
・ Mud Pond (Sunapee, New Hampshire)
・ Mud pump
・ Mud River
・ Mud River (Georgia)
・ Mud River (Kentucky)
・ Mud River (Red Lake)
・ Mud River (Thief River)
・ Mud River (West Virginia)
・ Mud River Covered Bridge
・ Mud River railway station


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Mud motor : ウィキペディア英語版
Mud motor

A mud motor (or drilling motor) is a progressive cavity positive displacement pump (PCPD) placed in the drill string to provide additional power to the bit while drilling. The PCPD pump uses drilling fluid (commonly referred to as drilling mud, or just mud) to create eccentric motion in the power section of the motor which is transferred as concentric power to the drill bit (well). The mud motor uses different rotor and stator configurations to provide optimum performance for the desired drilling operation, typically increasing the number of lobes and length of power assembly for greater horsepower. In certain applications, compressed air, or other gas, can be used for mud motor input power. Normal rotation of the bit while using a mud motor can be from 60 rpm, to over 100 rpm.
==Basic principle==

Based on the principle developed by Rene Moineau, the theory states that a helical rotor with one or more lobes will rotate eccentrically when the stator contains more lobes than the rotor. The flow of the fluid transmits power allowing the assembly to rotate and turn the bit.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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