Analysis About Drill String Vibration of Horizontal Well

During the engineering of horizontal well, drill string is in the complicated moving state, strong vibration is the main reason that induces drill string failure. Drill string vibrations usually have axial vibration, lateral vibration, torsional vibration and coupling vibration, the drill string near the bottom of well usually vibrates strongly. As an example to G78-E15, the variety of vibration is analyzed by using ANSYS, the model of vibration is established, the rules of vibration are obtained. The analysis can provide reliable theory basis in order to avoid resonance of drill string.