压裂液对高压弯管冲蚀作用的数值分析

Research on Erosion Wear of Fracturing Fluid on High Pressure Elbow

油气田水力压裂施工时,高速注入的压裂液会对高压管汇内壁产生一定的冲蚀破坏,其中弯管的冲蚀问题尤其严重。应用计算流体力学方法及相应的CFD软件建立适合于水力压裂工况的固液两相流综合数学模型,运用FLU-ENT软件的冲蚀模型对高压弯管的冲蚀磨损进行模拟,得到弯管部件受冲蚀最严重的区域。结果表明:压裂液对高压弯管的冲蚀磨损主要发生在弯头的外弧内壁,最大磨损率出现在弯头流动出口与直管相接的部位;携砂液流量是影响材料冲蚀磨损率的关键因素之一,支撑剂浓度、流体动力黏度也对材料冲蚀磨损率有较大影响。

The high-speed injected fracturing damage to high pressure pipe manifolds, lead to wear on high pressure pipe manifolds is fluid with solid particles （fracturing proppants）will cause serious erosion serious material loss and equipment failure. Thus the prevention of erosive regard ing. Computational fluid dynamics （CFD） analysis nisms leading ed as one of the most important problems in practical engineer- was used to investigate the major factors affecting erosion. The mecha- to the erosion process were discussed and erosion rate was investigated as a function of flow rate, slurry con- centration, proppant（ solid particles） size and density, and fluid viscosity. It is found that erosion phenomenon in high pressure pipeline is highly non-uniform with elbow extrados being more susceptible to erosion as compared to intrados. The areas where the serious erosion rates appear are in the outer wall of inner surface where the maximal particle concentration values and pressures appear, the maximal erosion part at inner wall near to elbow outlet. Slurry flow rate is the most signif- icant factor affecting erosion, and slurry concentration and fluid viscosity are also found to influence erosion rate greatly.