材料期刊网

目的：防止陶粒对滑套球座产生破坏。方法利用有限元软件 LS-DYNA 对陶粒冲击滑套球座进行建模，分别改变陶粒与滑套球座表面涂层之间的摩擦系数、滑套球座涂层的厚度、陶粒的粒径、陶粒的速度和陶粒速度相对于滑套球座表面的角度，通过仿真结果观察参数变化对滑套球座表面应力的影响。结果随着陶粒和球座之间的静摩擦系数由0.1增加到0.4，球座的最大表面应力由1.67 GPa增加到2.33 GPa。随着球座表面涂层厚度由3μm增大到6μm，球座的最大表面应力由2.05 GPa减小到0.89 GPa。随着陶粒粒径由50μm增加到80μm，球座的最大表面应力由1.67 GPa增加到3.63 GPa。随着陶粒速度由24 m/s增加到96 m/s，球座的最大表面应力由0.96 GPa增加到2.42 GPa。随着陶粒和球座表面之间的夹角由15°增加到60°，球座的最大表面应力由1.67 GPa增加到4.12 GPa。结论压裂液的性能会影响陶粒和球座之间的摩擦系数，进而影响球座的表面应力大小。球座的表面涂层厚度适当增大可以降低其表面的最大应力，压裂液中陶粒的直径越大，单个陶粒对球座造成的冲击应力越大。可以通过设计使滑套球座表面与中心线的夹角尽量小，以减小球座的最大表面应力。施工排量的增大会加剧球座的破坏。

ABSTRACT:Objective To prevent damage of sleeve tee caused by sand.Methods Using the finite element software LS-DYNA, the impact of sand on sleeve tee was modeled. By changing the coefficient of friction between the ball seat surface and sand, the thickness of the coating, the diameter of sand, the speed of sand, the angle between sand velocity and sleeve tee surface, the effects of parameter changes on sleeve tee surface stress were observed by simulation results.Results With the stat-ic coefficient of friction between the sand and the ball seat increasing from 0.1 to 0.4, the maximum surface stress on ball seat increased from 1.67 GPa to 2.33 GPa. With the coating thickness on the ball seat surface increasing from 3μm to 6μm, the maximum surface stress ball seat decreased from 2.05 GPa to 0.89 GPa. As the diameter of sand increased from 50μm to 80μm, the largest surface stress on the ball seat increased from 1.67 GPa to 3.63 GPa.With the sand speed increasing from 24 m/s to 96 m/s, the maximum surface stress on ball seat increased from 0.96 GPa to 2.42 GPa.With the angle between the sand speed and ball seat surface increasing from 15°to 60°, the maximum surface stress on ball seat increased from 1.67 GPa to 4.12 GPa. Conclusion Performance of fracturing fluid affected the coefficient of friction between the sand and the ball seat, thereby af-fecting the tee surface stress magnitude; appropriately increasing the surface coating thickness of tee could reduce its maximum stress. The larger the diameter of sand, the greater the stress on the ball seat. The sleeve could be designed to make the angle between the surface and the center line of the ball seat as small as possible to reduce the maximum surface stress on ball seat. Increased construction could exacerbates the destruction of tee.