多相流下剪切阀连续波发生器水力转矩参数化建模与分析

Parametric Analysis Method of Hydraulic Torque Acting on Shear valve Continuous Wave Generator under the Influence of Multiphase Flow

振荡剪切阀连续波发生器(shear valve continuous wave generators,SVCWGs)具有信号传输速率高、鲁棒性强的特点,具有广阔的应用前景,而对于作用于剪切阀转子的水力转矩规律不明确制约了其发展。目前关于多相流影响下作用于具有任意形状阀口的振荡剪切阀的水力转矩的研究尚不充分,对于水力转矩的变化规律尚不明确。为此,基于流体动量定理,采用有限元方法,建立了分流量负载转矩分析模型,并采用计算流体力学(computational fluid dynamics,CFD)仿真加以验证,并分析了井深及钻井液性质对于水力转矩的影响。结果表明:作用于振荡剪切阀的水力转矩呈先增大后减小趋势,且方向始终为使通流面积最大的方向;水力转矩随井深的增加略有减小;水力转矩随固相含量和液相密度的增加而增大;钻井液气相含量对水力转矩的影响很小。研究成果可为剪切阀连续波发生器设计提供理论参考。

Shear valve continuous wave generators(SVCWGs)has the characteristics of high signal transmission rate and strong robustness,and has broad application prospects.However,the unclear hydraulic torque law acting on the shear valve restricts its development.At present,the research on the hydraulic torque acting on the shear valve with arbitrary shape orifice under the influence of multiphase flow is still insufficient,and the variation rule of hydraulic torque is still unclear.Therefore,Based on the fluid momentum theorem,using the finite element method,an analysis model of the load torque of the divided flow was established and verified by computational fluid dynamics(CFD)simulation,and the influence of well depth and drilling fluid properties on the hydraulic torque was analyzed.The results show that the hydraulic torque acting on the shear valve increases first and then decreases,and the direction is always the direction that maximizes the flow area.The hydraulic torque decreases slightly with the increase of well depth.The hydraulic torque increases with the increase of solid content and liquid density.The gas content of drilling fluid has little influence on the hydraulic torque.The research results can provide a theoretical reference for the design of SVCWGs.