空气钻井中颗粒对排气管的冲蚀分析  

ABRASION OF EXHAUST PIPE BY THE HIGH-SPEED GAS WITH THE CUTTING IN AIR DRILLING

作　　者：姚建林[1] 狄勤丰[1] 王文昌[1] 胡以宝[1] 

机构地区：[1]上海大学应用数学和力学研究所环境与能源工程关键力学问题重点实验室

出　　处：《钻采工艺》2009年第5期13-15,124,共3页Drilling & Production Technology

基　　金：国家自然科学基金项目(No.50174047和No.50674065);上海市科委项目(061658035);上海大学创新基金项目资助

摘　　要：空气钻井中,携带岩屑颗粒的高速气体对管柱、尤其对地面的排气弯管会造成严重的冲蚀。利用CFD软件计算了90°弯角的排气管中气体的压力和速度分布,仿真了弯管中颗粒的运移轨迹,对比了不同弯角下颗粒对排气管的冲蚀速率,定性地分析了岩屑颗粒对排气管的冲蚀规律。结果表明,在弯管外侧壁面的气体压力明显大于弯管内侧壁面,速度则体现相反规律;弯管外侧是最易发生冲蚀的位置;颗粒对弯管的冲蚀速率是随着弯角的增大而增大,但是在不同的弯角范围内,冲蚀速率的变化趋势不同,在20°～40°范围内冲蚀速率变化较缓慢,在100°～140°范围内冲蚀速率变化速度明显增加。The pipe is severely eroded by the high-speed gas with the cutting in air drilling,particular towards the exhaust pipe on the ground.The pressure and velocity of the gas were calculated and the particle trajectories were simulated in the exhaust pipe with 90 bend angle by employing the CFD software in this paper.The erosion rate of the exhaust pipe by the particle in different bend angles was compared,and the erosion law of the exhaust pipe by the cutting was analyzed qualitatively.The results showed that the gas pressure in the lateral of elbow was obviously larger than that in the inside of bend pipe,though the velocity showed an opposite pattern.It was also found that the lateral of bend pipe was prone to erode.In addition,the erosion rate increased along with the angle of elbow,while which inclined to vary in different range of angles.Furthermore,the variety of erosion rate was relatively slow between 20°～40°,and it was remarkably increased between 100°～140°.

关 键 词：排气管 冲蚀速率 岩屑颗粒 空气钻井 

分 类 号：TE242.7[石油与天然气工程—油气井工程]