Performance Parameters of Hydro-oscillator and Their Impacts on Drag Reduction Rate
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.
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万方数据
维普
