摘要
井下节流器是水力加砂压裂施工中的重要元件之一。对在节流器内壁面设置肋条以提高其抗冲蚀性能的方法,采用考虑颗粒-颗粒碰撞的离散颗粒硬球模型进行了数值模拟,并采用半实验关联式计算了节流器内壁面的冲蚀速率,进一步对肋条的几何参数进行了优化。结果表明,设置肋条不仅可以在壁面附近形成类似滚动轮子的流场结构,减弱连续相的流速,还可以将90%以上冲击颗粒的速度降低到0.5 m/s以下,从而明显地提高了节流器的抗冲蚀性能;同时,当肋条高度H为3 mm、宽度B与间距L相同(5 mm),布置4个肋条时可以达到相对最佳的抗冲蚀效果。
Downhole throttleer is one of the most important components during sand fracturing operation. The discrete particle hard sphere model which considers particle-particle interaction was used in the simulation of the anti-erosion performances of an erosion reducing method through setting ribs on the inner wall of throttleer. The erosion rate of the inner wall was calculated by employing semi-empirical formulations, and the rib geometrical parameters were further optimized. The results show that the continuous flow travels like a rolling wheel near the wall, which can reduce the velocity of continuous flow, and the velocity of more than 90% impact particles is limited under 0.5 m/s after setting ribs. The anti-erosion performance is improved obviously. The relative best antierosion performance can be achieved when 4 ribs are set with a height H of 3 mm, a width B of 5 mm, and an interval L of 5 mm between ribs.
出处
《化学工程》
CAS
CSCD
北大核心
2009年第11期16-19,共4页
Chemical Engineering(China)
基金
国家自然科学基金委创新研究群体基金项目(5052160450323001)
国家自然科学基金委重点项目(50536020)
关键词
液固二相流
节流器
抗冲蚀
肋条
数值模拟
liquid-solid two-phase flow
throttleer
anti-erosion
ribs
numerical simulation
