Design And Dynamic Analysis Of A New Point-Bit Rotary Steerable Drilling System

Rotary steerable drilling system is the key technical equipment to make drillingprocesses of horizontal well, extended reach well and other complex geologicalstructure intelligent and automotive. To satisfy the needs of domestic oil and gasexploration, improve international competitiveness of domestic drilling industry, theresearch of rotary steerable drilling system makes important significance. This thesisaimed at a new rotary steerable drilling system, some key technology centered onparameters and structure design and dynamic properties. The main achievements areas follows:(1) Parameters and structure design. The working principle of a new rotary steerabledrilling tool is described. The design process of primary structure parameters arecompleted, based on the parameters established the3D parametric model withsoftware SolidWorks.(2) Kinematics and dynamic modeling of mandrel. The statics model is establishedand the structure parameters are optimized. The steady state dynamic model ofoffsetting mandrel is determined by use of integral variation method Hamilton’sprinciple, which will be the guidelines for the design of control system.(3) Kinematics/dynamics modeling of offsetting mechanism. Kinematic model,torsional concentrated parameter model and pan torsion coupling dynamic modelare established respectively. Inherent characteristics and vibration responsecharacteristics are analyzed and simulated which lay theory foundation for thefurther dynamic design of offsetting mechanism.(4) Virtual prototype modeling and simulation. The rigid-body dynamics simulationand analysis are implemented with software ADAMS. In order to prove thecorrectness of offsetting mechanism dynamic model, model analysis, staticsanalysis and harmonic analysis are performed based on software ANSYS.