高压鱼尾管汇冲蚀规律研究

Analysis on erosion laws of high-pressure fishtail manifold

针对高压鱼尾管汇在长期压裂作业中受各种因素影响而导致管汇内壁出现穿孔、刺漏、破损等现象,基于液固两相流和冲蚀磨损理论,建立了夹角分别为90°、120°、150°鱼尾管的三维模型,通过ICEM软件划分网格,并应用计算流体力学方法及ANSYS-Fluent软件对鱼尾管汇进行数值模拟,研究颗粒直径、颗粒形状、质量流量、流体速度4种因素对管汇冲蚀的影响,分析高压鱼尾管汇内壁的冲蚀磨损规律。结果表明:夹角为90°、120°、150°的鱼尾管汇冲蚀磨损最为严重区域在两支管与主管的交汇处,即相贯线位置,出口壁面的冲蚀磨损稍微薄弱;鱼尾管汇的冲蚀磨损随着质量流量、流体速度的增大而逐渐增强,随着颗粒形状系数、颗粒直径的增大逐渐减弱,并趋于稳定;在4种因素的共同影响下,150°鱼尾管汇的冲蚀磨损幅度波动最明显,90°鱼尾管汇的冲蚀磨损相对较小。研究结果能够有效评估分析高压鱼尾管汇在压裂作业中的失效问题。

Due to various factors in the long-term fracturing operation of the high-pressure fishtail manifold with perforation,puncture leakage and damage,three-dimensional model of fishtail manifolds with angles of 90°,120°,and 150°were established based on mechanism theory of solid-liquid two-phase flow and erosion wear.The mesh was divided by ICEM software and the fishtail manifold was simulated by computational fluid dynamics and ANSYS-Fluent software to numerically simulate the erosion of the fishtail manifolds under the influence of fluid velocities,mass flow rates,particle diameters and particle shape factors.The erosion and wear law of the inner wall of high pressure fishtail manifold was analyzed.The results show that the erosion wear of fishtail manifolds with included angles of 90°,120°and 150°are the most serious area at the intersection of two branches and main pipe line.The erosion wear of fishtail manifold increases with the increase of mass flow rate and fluid velocity,and decreases with the increase of particle shape coefficient and particle diameter.Under the common influence of four factors,the erosion wear amplitude of 150°fishtail manifold fluctuates most obviously,and the erosion wear of 90°fishtail manifold is relatively small.The research results can effectively evaluate and analyze the failure of high-pressure fishtail manifold in fracturing operation.