M.R. Ghazavi and M. Zamanian (Iran)
Drillstring, Drill collar, Lateral Vibration, Trajectory,
In this paper lateral vibration in an unbalance drill collar
in oil well has been studied with nonlinear effects of
stabilizers clearance and friction.
A simple model of mass-spring is used to compare the
trajectory of drill section from Laplace transform method
and numerical method .The operation of numerical
method has been accomplished by a C++
Kutta) . The operations of Laplace transform has been
accomplished by a Maple program. This program can
predict the trajectory of the collar section and the stability
of its motion.