The application of hydraulic oscillator can solve the problems of large friction and serious pressure support in the drilling process of extended reach well and long horizontal well, but the conventional hydraulic oscillator parameter setting is not reasonable, high pressure consumption, easy to make the ground machine pump overload operation and failure. Therefore, based on the LuGre dynamic friction model theory, a calculation model for the friction between drill string and rock wall under the condition of longitudinal oscillation is established, and the influence law of hydraulic oscillator oscillation parameters on drag reduction efficiency is studied. The results show that the change of oscillation intensity, oscillation frequency and oscillation amplitude can improve the drag reduction efficiency, and the increase trend of drag reduction efficiency is first increased and then decreased. The selection of each parameter has the optimal value. According to the analysis of orthogonal test results, it is found that the reduction degree of friction between drill string and borehole wall rock by each parameter is in the order of oscillation intensity, oscillation frequency and oscillation amplitude from the largest to the smallest.

中文翻译：

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水力振荡器对水平井钻井减阻效率影响因素研究

液压振荡器的应用可以解决大位移井、长水平井钻井过程中摩阻大、压支严重的问题，但常规液压振荡器参数设置不合理，压力消耗高，容易使地面机泵过载运行和故障。为此，基于LuGre动摩擦模型理论，建立了纵向振荡条件下钻柱与岩壁摩擦力的计算模型，研究了水力振子振荡参数对减阻效率的影响规律。结果表明，改变振荡强度、振荡频率和振荡幅度可以提高减阻效率，且减阻效率的增加趋势是先增大后减小。各参数的选择都有最优值。根据正交试验结果分析发现，各参数对钻柱与井壁岩石摩擦力的降低程度从大到小依次为振动强度、振动频率、振动幅度。