Considering the displacement and force boundary conditions of drill string at the position of the top and the bottom of well dynamics experimental device of drill fluid coupling in straight hole was built to do two kinds of test; the column vibrating experiment under the conditions of different vibrating frequency,different axial excitation force and different flux and the column rotating test under the conditions of different axial excitation force,different rotating speed and different flux. The experimental results showed that,vibration frequency,rotary speed and flux were the main factors affecting the motion state of drill string. Under the air medium conditions, withthe vibration frequency increased,the radial displacement of the column was unchanged,but vibration force and axial acceleration increased significantly. Under the action of circulation fluid, the growth trend of the axial vibration force and acceleration would be reduced. Under the air medium conditions,with the rotating speed increased, vibration force had no change obviously; the drill string transverse displacement and the pole axial acceleration were increasing,but the axial vibration force,amplitude and the acceleration of the drill string amplitude were reduced under the ac-tion of fluid in circulation, acceleration amplitude reduced significantly, too. So, fluid circulationcan improve the pole vibration,obviously.%考虑钻柱在井口、井底的位移边界条件和力边界条件,建立了直井内钻柱与钻井液耦合动力学试验装置,进行了不同激振频率、不同轴向激振力、不同排量条件下的杆柱振动试验和不同轴向激振力、不同转速、不同排量条件下的杆柱旋转试验.试验结果表明,激振频率、转速和循环流体是影响钻柱运动状态的主要因素.在空气介质的情况下,随着激振频率的增加,杆柱的横向位移基本保持不变,轴向激振力、轴向加速度有显著增加；在循环流体作用下会减小轴向激振力、轴向加速度的增长趋势.在空气介质的情况下,随着转速的增加,轴向激振力变化不大,而钻柱的横向位移、杆柱轴向加速度均呈现出增加的趋势；但在循环流体的作用下,轴向激振力、振幅及钻柱的加速度振幅都降低,加速度振幅也显著降低.可见,流体循环可明显改善杆柱振动.
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