中国石油大学学报（自然科学版）Issue(1)：83-87,5.DOI:10.3969/j.issn.1673-5005.2015.01.012
脉冲空化多孔喷嘴破岩效果试验研究
Experimental study of rock breaking efficiency by pulsed cavitating multi-hole nozzle
摘要
Abstract
Jet nozzle is a key device in radial horizontal well drilling technique, of which the rock breaking ability directly af-fects the extension of horizontal holes and drilling rate. On the basis of the multi-hole nozzle, a pulsed cavitating multi-hole nozzle was designed, and its modulation mechanism of pulsed cavitating jet was analyzed. Also, the rock breaking test was carried out to compare with the rock breaking result of pulsed cavitating multi-hole nozzle. The results indicate that the rock breaking result of pulsed cavitating multi-hole nozzle is better than that of multi-hole nozzle. The hole depth from pulsed cavi-tating multi-hole nozzle is 1. 02-2. 18 times than that from multi-hole nozzle. The rock breaking volume from pulsed cavitat-ing multi-hole nozzle is 1. 23-2. 35 times than that from multi-hole nozzle. To guarantee the minimum hole diameter is bigger than nozzle diameter, jet impact pressure should not be lower than 30 MPa in the experiment. There is an optimal standoff distance in the bock breaking, which is 12 mm under the current testing conditions. The results suggest that using pulsed cavitating multi-hole nozzle can increase the extension of horizontal holes and improve drilling rate in radial drilling tech-nique.关键词
脉冲/空化/多孔喷嘴/孔眼直径/孔眼深度/破岩体积Key words
pulse/cavitating/multi-hole nozzle/hole diameter/hole depth/rock breaking volume分类
信息技术与安全科学引用本文复制引用
马东军,李根生,金磊,黄中伟,牛继磊,宋先知..脉冲空化多孔喷嘴破岩效果试验研究[J].中国石油大学学报（自然科学版）,2015,(1):83-87,5.基金项目
国家重点基础研究发展计划项目(2010CB226700) （2010CB226700）
国家科技重大专项(2011ZX05009-005) （2011ZX05009-005）
