摘要
Abstract
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.关键词
陶粒/滑套球座/LS-DYNA/涂层/表面应力/破坏Key words
sand/sleeve tee/LS-DYNA/coating/surface stress/damage分类
矿业与冶金
