An analysis of the drill string vibration during gas drilling of horizontal wells

During horizontal well drilling,the drill string is in complicated motion.Vibration is common during drilling,and resonance is one of the major factors leading to drill string failure.What's more,the drill string used in gas drilling is subject to failure due to too much dynamic response to the drilling operation.So it is important to analyze the vibration produced on the drilling string during horizontal drilling with gas.The ANASYS software has been used to analyze axial vibration,radial vibration,torsional vibration,and coupling vibration produced on the drill string,and models for those types of vibration have been set up.The vibration law and the resonance frequencies are drawn out after studying data from actual cases.This study will be helpful for minimization of drilling tool failures,optimization of drilling parameters,and avoiding drill string resonance.