downhole motor การใช้

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Downhole mechanics are usually more violent also because the volume of fluid going through a downhole motor or downhole hammer is greater than an equivalent fluid when drilling balanced or over balanced because of the need of higher up hole velocities.
Corrections are regularly made by techniques as simple as adjusting rotation speed or the drill string weight ( weight on bottom ) and stiffness, as well as more complicated and time-consuming methods, such as introducing a downhole motor.
During critical angle and direction changes, especially while using a downhole motor, an MWD ( Measurement while drilling ) tool will be added to the drill string to provide continuously updated measurements that may be used for ( near ) real-time adjustments.
Drilling directionally with a downhole motor requires occasionally stopping rotation of the drill pipe and " sliding " the pipe through the channel as the motor cuts a curved path . " Sliding " can be difficult in some formations, and it is almost always slower and therefore more expensive than drilling while the pipe is rotating, so the ability to steer the bit while the drill pipe is rotating is desirable.
A "'kelly drive "'refers to a type of well drilling device on an oil or gas drilling rig that employs a section of pipe with a polygonal ( three-, four-, six-, or eight-sided ) or drill bit is attached at the end of the drill string and thus the kelly drive provides the means to turn the bit ( assuming that a downhole motor is not being used ).

downhole motor การใช้

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