水力振荡器性能参数与减阻率影响规律研究

Performance Parameters of Hydro-oscillator and Their Impacts on Drag Reduction Rate

为更科学地优化水力振荡器的参数设计及施工参数设置,建立了水平段钻柱振动模型并进行了数值模拟,采用Minitab软件对数值模拟结果进行了分析,研制水力振荡减阻试验装置并开展了振荡减阻机理试验,通过方差分析了钻压、振动幅值及频率对减阻率的影响规律。分析结果表明:各因素对摩阻的影响程度由大到小依次为振动幅值>钻压>振动频率,其中钻压对减阻率的影响表现为消极,振动幅值和频率对减阻率的影响表现为积极,同时钻压、振动幅值、频率3个因素对减阻率变化的贡献率分别为11.76%、51.98%及10.97%,振动幅值是水力振荡器设计中需要优先考虑的因素。研究结论可为水力振荡器的参数设计及现场应用中施工参数的设置提供理论支撑。

In order to rationally optimize the parameter design of hydro-oscillator and operating parameter set-ting in field application,a model of drill string oscillation in horizontal section was built for numerical simulation,and the numerical simulation results were analyzed by using the Minitab software.Then,a hydraulic oscillation drag reduction test device was developed to determine the oscillation drag reduction mechanism.Finally,the im-pacts of weight on bit(WOB),oscillation amplitude and frequency on the drag reduction rate were identified through variance analysis.The results show that the factors are ranked by the severity of impact on drag reduction rate as oscillation amplitude>WOB>oscillation frequency.Specifically,WOB has a negative impact on drag re-duction rate,while oscillation amplitude and frequency have positive impacts on drag reduction rate.The contribu-tion rates of WOB,oscillation amplitude and frequency on drag reduction rate are 11.76%,51.98%and 10.97%,respectively.Clearly,oscillation amplitude is a factor to be preferentially considered in the design of hydro-oscilla-tor.The research findings provide theoretical support for the parameter design of hydro-oscillator and operating pa-rameter setting in its field application.