摘要
本文对不同喷嘴组合方式时超高压射流井底流场特性进行数值模拟.根据得出的井底流场的速度矢量图和井底压力分布图,分析超高压钻头喷嘴组合形式对流场结构及钻进效果的影响.结果表明,三个垂直的边喷嘴组合破岩效率较高,但清洗井底效果不佳,冲蚀井壁严重;中心加一个喷嘴可解决清洗井底及冲蚀井壁的问题,但要求高压流体排量增加;两个垂直边喷嘴与一个中心倾斜喷嘴的组合及一个垂直边喷嘴和一个中心倾斜喷嘴的组合流场结构对钻进较为有利.
To maximize utilization of ultra high pressure jet energy, uhra high pressure jet flow field is studied with numerical simulation on different nozzle combinations. According to bottom flow field velocity vector and bottom hole pressure distribution, flow structure and drilling of nozzle combinations are analysed. A combination of three vertical edge nozzles has high efficiency on rock but is ineffective in cleaning the bottom and it results in wall erosion severely. Center plus a nozzle can clean the bottom and solve the problem of anti-wall erosion, but it requires greater high-pressure fluid displacement. Two vertical side nozzles and a center tilt nozzle or a vertical edge and a central nozzle combination is more favorable. A reasonable nozzle combination is essential in improving drilling efficiency.
出处
《计算物理》
EI
CSCD
北大核心
2011年第5期686-692,共7页
Chinese Journal of Computational Physics
基金
中国石油集团公司重点研究课题(05A20301)资助项目
关键词
机械钻速
超高压射流
喷嘴组合
数值模拟
rate of penetration
ultra-high pressure jet
nozzles combination
numerical simulation
