How-Motor-Bend-Affects-Stick-Slip-Vibrations-Modeling-and-Case-Study PDF 4
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Contact friction along drill string is one of root causes of stick-slip vibrations, especially when drilling an unconventional well with a long<br>lateral section. By using a downhole steerable motor in rotating mode, the motor bend can create important contact forces between the<br>drill string and wellbore and consequently generate considerable frictional torques opposed to the drill string rotation. Therefore, for<br>more accurate estimations of stick-slip behavior, these forces need to be considered in stick-slip modeling.<br>In this paper, a torsional vibration model based on a mass-spring system wit
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