摘要
开展喷嘴空化起始能力研究,对增大射流破岩效果,提高深井钻井的速度具有非常重要意义。利用瞬态流和水声学原理设计研制了自振空化喷嘴,通过试验研究了该喷嘴的空化起始能力,并与锥形喷嘴进行了比较,结果表明在更深的井底或更高的围压条件下,自振空化喷嘴比普通锥形喷嘴具有更大的起始空化数和更强的空化起始能力,最大起始空化数达1.67,而锥形喷嘴最大值仅为0.54。现场试验也证实了自振空化喷嘴钻头在增加进尺、提高机械钻速方面有更显著作用。
It's of great significance to research into the inception ability of nozzles and enhancement of their rock erosion effect to improve penetration rate of drilling deep wells. Self-resonant cavitating nozzle is designed with the principle based on the theory of fluid transients and hydro-acoustics. The lab investigation demonstrates that higher inception cavitation number and stronger cavitation effect under higher ambient pressure can be achieved in deeper bottom hole or under higher ambient pressure with self-resonant cavitating nozzle than the conventional cone-shaped nozzle, and the enhanced inception cavitation number can be as high as 1.67 while that of cone-shape nozzle is usually with 0.54 as the highest. Field tests are proved that the bit with self-resonating nozzles can significantly increase the footage of the bit, improving the penetration rate.
出处
《机械工程学报》
EI
CAS
CSCD
北大核心
2005年第6期218-223,共6页
Journal of Mechanical Engineering
基金
国家杰出青年科学基金(50125413)中国石油天然气集团公司重点应用基础研究基金(03A20201)资助项目。
关键词
喷嘴
空化起始
空化射流
钻井速度
Nozzle Cavitation inception Cavitation jet Drilling speed
