目的 提升水平井分段压裂中投球滑套球座的抗冲蚀磨损性能。方法 基于流体力学、冲蚀理论，采用Fluent软件建立压裂球座固-液两相流冲蚀模型，对球座冲蚀磨损进行研究，分析不同角度下双锥面结构对球座冲蚀磨损的影响。在此基础上，开展球座冲蚀试验，研究3种不同表面材料对球座冲蚀的影响。结果 数值模拟显示，球座的冲蚀磨损主要发生在前端锥面上，最大冲蚀速率发生在锥面与密封面交接处。其原因是，锥段直径逐渐减小，导致固相颗粒在过流断面上的速度和浓度增加，动能增大，使得在斜面导流作用下对锥面的撞击与切削次数增多，冲击力增强，造成壁面材料损失。冲蚀试验结果显示，在3种不同表面材料球座的冲蚀中，双涂层(有机涂层+碳化钨涂层)球座的耐冲蚀能力优于碳化钨涂层和硬质合金球座。结论 设计双锥面结构球座时，合理地选择锥面角度能够有效提升球座的耐冲蚀性能，否则会导致球座的抗冲蚀性能下降。对球座进行表面喷涂强化处理时，较单一涂层而言，选择双涂层的抗冲蚀能力更好。

In order to improve the erosion resistance of the ball-throwing sleeve ball seat in staged fracturing of horizontal wells, based on fluid mechanics and erosion theory, the paper uses Fluent software to establish the solid-liquid two-phase flow erosion model of fracturing ball seat to study the ball seat erosion wear. This paper analyzed the impact of the ball seat erosion in different angles of double cone structure and carried out the ball seat erosion test to study the erosion of three different surface materials of the ball seat. The numerical simulation shows that the erosion of the ball seat mainly occurs on the front cone surface and the maximum of erosion rate occurs at the junction of the cone surface and the sealing surface. The reason is that the diameter of the cone section gradually decreases, resulting in increase of the velocity and concentration of solid particles. With the action of the inclined surface, the increase of kinetic energy will increase the number of impacts and cuttings of the cone surface, increasing the impact force and causing wall material loss. Erosion test results show that in the erosion of three different surface materials of the ball seat, the erosion resistance of the double-coated (organic coating + tungsten carbide coating) ball seat is better than that of the tungsten carbide coating and the cemented carbide ball seat. When designing a ball seat with a double cone structure, a reasonable selection of the angle of the cone can effectively improve the erosion resistance of the ball seat, otherwise it will cause descending erosion resistance of the ball seat. When spraying the surface of the ball seat, the choice of double coating has better erosion resistance than single coating.