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针对深层气井压裂施工排量和加砂量的不断增加,压裂管柱磨损日益严重,基于欧拉-欧拉双流体模型,结合携砂压裂液的冲刷磨损试验,建立半试验的冲刷磨损模型,对深层气井压裂管柱突扩结构的内流态和冲刷磨损规律进行数值模拟,得到速度分布、砂浓度分布、壁面冲击速度和冲击角度等流场特性,以及突扩管柱的冲刷磨损量.结果表明:在压裂管柱突扩结构后出现分离和再附,从而引起砂浓度的变化,对管柱内壁形成一定的冲刷磨损作用,冲刷磨损量较大部位在突扩后台阶变截面处及再附点后5倍管径范围内,模拟得到的主要磨损部位与现场失效部位基本吻合.
In view of the increase of displacement and sand addition in fracturing of deep gas wells, the wear of fracturing columns is more and more serious. Based on the Euler-Euler dual-fluid model and the scouring abrasion test of carrying fracturing fluid, a semi-experimental scouring Wear model, numerical simulation of internal flow and erosion of the sudden expansion structure of fractured gas wells in deep gas wells results in velocity distribution, sand concentration distribution, wall impact velocity and impact angle of flow field characteristics, as well as the sudden expansion of the column The results show that separation and reattachment occur after the sudden expansion of the fractured pipe string, resulting in the change of sand concentration and forming a certain erosion and erosion effect on the inner wall of the pipe string. Step change section and re-attached point within 5 times the diameter range, the simulation of the main wear site and site failure basically consistent.