摘要
针对反循环钻进中水龙头弯管磨损失效问题,应用计算流体动力学方法对水龙头弯管内气固两相流场进行数值模拟,研究弯管内岩屑颗粒的运动轨迹及壁面磨损分布,并进一步分析岩屑特性对壁面磨损的影响。研究结果表明:气固两相流经过弯管时,岩屑与壁面在弯管30°,90°和150°转角位置存在碰撞集中区,对应形成3个壁面磨损区,其中30°转角位置磨损最严重,形成刺漏点;此外,岩屑颗粒特性对弯管磨损存在影响,随颗粒速度或质量流量的增大,弯管磨损速率显著增大;随颗粒直径增大,磨损速率先增大后减小;颗粒密度对弯管磨损影响不明显。
Aiming at the serious problem of erosion of swivel elbow by cuttings in reverse circulation drilling, the gas-solid two-phase flow field in swivel elbow was simulated based on the computational fluid dynamics （CFD）. The particle trajectories of cuttings and erosion of elbow were studied and the effects of cuttings characteristics on erosion rate of the elbow were further analyzed. The simulation results show that during the gas-solid two-phase flow process, there are three main impact regions in 30°, 90°and 150° positions of the elbow. Corresponding to the impact regions, there are three erosion areas. And the most serious location of perforation caused by cuttings is at 30° position of the elbow. With the increase of the velocity or the mass flow of cuttings, the erosion rate of elbow significantly increases. The erosion rate increases at first then decreases with the increase of cuttings size. Density of particles has no obvious effect on the erosion rate.
出处
《中南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2013年第5期2053-2059,共7页
Journal of Central South University:Science and Technology
基金
高等学校博士学科点专项科研基金资助项目(20110133120013)
中央高校基本科研业务费专项资金资助项目(27R1202001A)
山东省自然科学基金资助项目(ZR2011EEQ012)
关键词
反循环
弯管
气固流
磨损
岩屑
数值模拟
reverse circulation
elbow
gas-solid flow
erosion
cuttings
numerical simulation
