目的 研究加砂压裂过程中，压裂液排量和含砂比对套管射孔孔眼冲蚀的影响规律。方法 运用CFD数值模拟方法，针对射孔套管内流场、流迹特性和颗粒轨迹开展模拟分析，并使用E/CRC和Oka冲蚀模型模拟了压裂施工排量为5~15 m³/min、压裂液含砂比为8%~23%工况下套管射孔孔眼及附近的冲蚀情况，总结其影响规律。结果 随着排量的增加，孔眼处流速激增，压降达到5.5 MPa，但在管底形成一定憋压。E/CRC冲蚀模型考虑了颗粒数量的影响，相比于Oka冲蚀模型更适合于压裂过程中套管孔眼系统冲蚀的实际情况，在孔眼处上部流量进口方向的冲蚀速度明显大于下部管道方向，且冲蚀程度向四周逐渐减小，E/CRC模型的最大冲蚀速率由2.14×10^?8 kg/(m².s)上升至5.85×10^?8 kg/(m².s)。随着压裂液含砂比的上升，E/CRC模型在孔眼处的最大冲蚀速率由2.21×10^?8 kg/(m².s)上升至95.6×10^?8 kg/(m².s)，孔眼附近管壁受冲蚀区域和冲蚀速率均逐渐增大，并在含砂比达到20%以上时，孔眼附近管壁最大冲蚀速率与孔眼处已相差无几。结论 排量和含砂比均与孔眼冲蚀速率成正相关，且含砂比的增大还会加速孔眼附近管壁的冲蚀。建议在高排量时使用低含砂比，高含砂比时使用低排量，以减少孔眼及附近管壁的冲蚀。

The work aims to study the effect of fracturing fluid displacement and sand volume fraction on casing perforation erosion in the process of sanding fracturing. CFD numerical simulation method was used to simulate and analyze the flow field, flow track characteristics and particle trajectory in the perforated casing. E/CRC and Oka erosion models were used to simulate the erosion of casing perforated perfs and their vicinity under the condition of fracturing displacement of 5-15 m3/min and fracturing fluid sand volume fraction of 8%-23%, and the influence rules were summarized. With the increase of displacement rate, the flow velocity at the perforation increased sharply and the pressure drop reached 5.5 MPa, but a certain pressure was formed at the bottom of the pipe. The E/CRC erosion model is more suitable for the actual situation of casing perf system erosion in fracturing process than the Oka erosion model due to the consideration of the influence of particle number. The erosion velocity in the inlet direction of the perforation is obviously higher than that in the lower direction of the pipe, the erosion degree in the surrounding direction gradually decreases. The maximum erosion rate of the E/CEC model increases from 2.14×10?8 kg/(m2.s) to 5.85×10?8 kg/(m2.s). With the increase of the volume fraction of sand content in fracturing fluid, the maximum erosion rate of E/CRC model at the perforation increases from 2.21×10?8 kg/(m2.s) to 95.6×10?8 kg/(m2.s). The erosion area and erosion rate of the pipe wall near the perforation increase gradually, and when the sand ratio reaches more than 20%, the maximum erosion rate of the pipe wall near the perforation is almost the same as that near the perforation. Both the displacement and sand ratio are positively correlated with the erosion rate of the perforation, and the increase of sand ratio will accelerate the erosion of the pipe wall near the perforation. It is recommended to use low sand ratio at high sand ratio and low sand ratio at high sand ratio to reduce erosion of perforations and adjacent pipe walls.