空气水平井中钻柱冲蚀模型与分析  

EROSION ANALYSIS OF CUTTINGS IN AIR DRILLING FOR HORIZONTAL WELL

作　　者：姚建林[1] 狄勤丰[1] 王文昌[1] 胡以宝[1] 

机构地区：[1]上海大学上海市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》2010年第5期15-17,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：空气钻水平井中,水平段携岩是一技术问题,但携带岩屑颗粒的高速气体对水平段钻柱的冲蚀也非常引人关注。利用计算流体动力学(CFD)软件计算了给定偏心距条件下水平井水平段环空中气体的速度分布和环空中岩屑的运移轨迹。通过分析了岩屑对钻柱及下井壁的冲蚀,给出不同偏心距下岩屑对钻柱的冲蚀速率,从而定性上得到岩屑颗粒对钻柱的冲蚀规律。结果表明,大环空中空气流速随着计算段长度的增大而增大,小环空中则呈现相反的规律;小部分岩屑将滞留在小环空中;岩屑对钻柱的冲蚀速率随着偏心距的增大而增大,而且偏心距在0.04m～0.06m范围内冲蚀速率达到最大。How to carry the cuttings is an important problem in air drilling of horizontal well,but the erosion of drilling string by the high-speed gas with cuttings is extremely concerned.Velocity distribution of the gas in horizontal section and the trajectories of cuttings in annulus were simulated by employing the CFD software under the given eccentricity.The erosion of drill string,as well as the one of the lower well-side was analyzed.Through comparing with the erosion velocities of drill string in different eccentricity,the erosion law was obtained qualitatively.The results showed that the gas velocity in large annulus increases along with the computation section length,though the velocity in small annulus shows an opposite law.It was also found that part of the cuttings was detained in small annulus.In Add ition,the erosion rate of drill string increases with the eccentricity,and reaches the maximum value between 0.04 m～0.06 m of it.

关 键 词：空气钻井 水平段 偏心距 冲蚀速率 

分 类 号：TE242.6[石油与天然气工程—油气井工程]