摘要
为了充分利用井底水力能量提高钻速,提出自吸环空流体式自激振荡脉冲射流钻井技术。采用大涡模拟与试验研究相结合的方法,分析自吸环空流体式自激振荡脉冲射流的调制机制及射流调制工具的结构参数对射流性能的影响。采用正交试验法进行数值模拟试验,优选射流调制工具的结构参数。结果表明:结构参数对射流性能影响显著,结构合理的吸入式自激振荡射流的性能明显优于非吸入式脉冲射流;射流调制工具出口脉冲射流速度脉动值与破岩深度之间呈显著的线性相关,脉动值越大,射流破岩效果越好。数值计算结果与试验结果吻合良好,表明所用研究方法可行。
The pulsed water jet drilling technology suck-in annulus fluids was proposed to take full use of the bottom-hole h
y- draulic power and promote the rock breaking efficiency. The large eddy simulation numerical analysis method was adopted to- gether with laboratory experiments to analyze the modulation mechanism of self-excited pulsed jet suck-in annulus fluids and the effect of structural parameters change on the jet performance of the modulator. The multi-factor orthogonal simulation ex- periments were done and the pulsed structure was optimized according to the fluctuating velocity. The results show that the structural parameters significantly influence the jet performance, and the suck-in modulator with a rational structure is superi- or to non-suck-in one. In addition, the bigger the outlet fluctuating velocity of the modulator, the better the rock-breaking effect, and there is a good.linear correlation between them. The simulation results agree welt with the laboratory experimental data, which indicates the feasibility of the structure optimization of the self-excited pulsed water jet.
出处
《中国石油大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2011年第6期76-80,94,共6页
Journal of China University of Petroleum(Edition of Natural Science)
基金
国家'973'重点基础研究发展计划项目(2010CB226703)
国家自然科学基金项目(50974130)
关键词
射流钻井
自激振荡
大涡模拟
岩石破碎
正交试验
结构优选
jet drilling
self-excited pulse
large eddy simulation
rock breaking
orthogonal experiment
structure optimization
