柱阀结构参数对涡轮式压力脉冲发生器性能的影响

摘要

针对现有水力脉冲振荡工具的动力系统及脉冲发生装置所存在的问题,提出了一种基于柱阀系统的涡轮式压力脉冲发生器,重点研究了柱阀结构参数对压力波形和波幅的影响.以阀芯柱面开口扇形角、阀座周向过流槽的轴向长度、固定节流孔数量与直径等参数为变量,并最终统一为柱阀的固定过流面积和周向过流面积,应用仿真软件Fluent模拟研究了不同结构参数对压力波形和波幅的影响规律.研究结果显示,柱阀的结构参数对脉冲发生器的性能影响非常显著:当钻井液流量一定时,固定节流总过流面积主要影响脉冲压力的最大值,不会改变脉冲压力高压区的宽度;可变的周向过流面积主要影响脉冲压力高压区的宽度,不会改变脉冲压力幅值.该研究结果对不同工况所要求的压力波形波幅的设计及井下脉冲振荡工具的优化设计具有参考价值.%Because of problems in the power system and also the pulse generating system of the pulse oscillator,mud pulse generators based on the cylinder valve have been developed.This paper reviews the effects of structural parameters of cylindrical valves on waveforms and amplitudes of the pressure.Taking the axial length of the valve seat circumferential opening,and the number of fixed orifices and the diameter of the fixed throttle as variables,the impact of different structural parameters on the pressure waveform are investigated by using CFD and FLUENT.Research results indicate that the structural parameters of the valve have significant influence on the performance of the generator.Under constant flow rate of drilling fluids,the sectional area in the fixed throttle may affect the maximum pulse pressurebut not the high-pressure range.On the other hand,the variable channel of the circumferential flows mainly affects the range of the pulse pressure but not the amplitude.Conclusions of the study may provide necessary reference for the design of the waveforms and amplitudes of pressure under the different working conditions,and thus optimize the design of pulse oscillation tools.