水力喷射压裂用喷嘴结构分析

Structure analysis on hydrajet-fracturing nozzle

为提高水力压裂用喷嘴在喷砂压裂过程中的喷射性能,利用计算流体力学软件建立了喷嘴流场模型,分析了喷嘴直圆柱段长度、收缩角和喷嘴全长对水力喷射特性的影响。结果表明,随着喷嘴直圆柱段长度的增加,喷射流体速度增加,能量损失减小;收缩角较小的喷嘴喷射动能较大且能量损失较小;喷嘴总长越长,流体速度保持越好。在井底空间条件限制下,通过分析3种结构参数的变化对水力性能的影响,最终确定了最优喷嘴结构参数。

In order to improve the hydraulic performance in the process of hydrajet-fracturing,the nozzle flow model was established by computational fluid dynamics software,and the influence of nozzle cylindrical length,shrinking angle and nozzle length on the hydraulic performance was analyzed.Results showed that with the increasing of cylindrical length,the injection velocity of the fluid increased and the loss of energy reduced.The nozzle with smaller shrinking angle can get greater kinetic energy and less energy loss.Finally,the optimal structure parameter of nozzle was confirmed under the bottom condition of well by analyzing the effect of the three structure parameters on hydraulic performance.