中国石油大学学报（自然科学版）2013，Vol.37Issue(2)：50-56,7.DOI:10.3969/j.issn.1673-5005.2013.02.008
水力射流降低井底压差技术
Reducing bottom-hole differential pressure by hydraulic jet
摘要
Abstract
Reducing the bottom-hole differential pressure (BHDP) and the cuttings hold-down effect can significantly improve the rate of penetration ( ROP). Based on the jet hydraulic pressure drawdown theory, the current research and development situation of the jet hydraulic pressure drawdown tools including annular jet pump, jet pump joint and jet pump bit, a peripheral nozzle jet pump bit was designed. Using hybrid grid method, the key factors affecting the depressurization capacity of the bit were analyzed. The results show that the main reason of reducing the depressurization capacity of the jet pump bit is the backflow of the bottom-hole fluid. The backflow rate is in direct proportion to the bit clearance and in inverse proportion to the angle between the reverse nozzle axis and the bit axis. To seal the bit clearance is the key point to improving the performance of the jet pump bit. The new vortex and jet pump combination bit can reduce the BHDP about 0. 45-0. 88 MPa, which is 3-4 times the depressurization effect of existing jet pump bit.关键词
射流/射流泵/井底压差/环空射流泵/射流降压短节/射流泵钻头/混合网格Key words
jet/ jet pump/ differential pressure/ concentric jet pump/ jet pump joint/ jet pump bit/ hybrid grid分类
能源科技引用本文复制引用
朱海燕,邓金根,何玉发,李斌,谢玉洪,黄凯文,赵靖影..水力射流降低井底压差技术[J].中国石油大学学报（自然科学版）,2013,37(2):50-56,7.基金项目
国家自然科学基金项目(51174219) （51174219）
国家重大科技专项(2011ZX5009-005) （2011ZX5009-005）
国家自然科学基金创新群体项目(51221003) （51221003）
