环空流体吸入式自激振荡脉冲射流调制元件结构优选研究  

Study on structure optimization of self-excited pulsed jet with suck-in annulus fluids

作　　者：倪红坚[1] 杜玉昆[1] 马琳[1] 王瑞和[1] 

机构地区：[1]中国石油大学石油工程学院,山东东营257061

出　　处：《水动力学研究与进展（A辑）》2011年第4期487-493,共7页Chinese Journal of Hydrodynamics

基　　金：国家重点基础研究发展计划(973计划)课题(2010CB226703);国家自然科学基金课题(50974130)

摘　　要：为充分利用井底水力能量提高破岩钻井效率,提出了环空流体吸入式自激振荡脉冲射流钻井技术。将数值模拟和试验研究相结合,分析了环空流体吸入式自激振荡脉冲射流调制元件结构参数的变化对射流破岩性能的影响。对比分析了调制元件的环空吸入量、出口流速、振荡腔负压值和进出口压差与射流破岩效果之间的关系,结果发现调制元件进出口的压差越大,射流破岩效果越好,二者呈显著线性相关。以调制元件进出口压差为优选依据,采用正交试验法,进行了数值模拟试验,优选了调制元件的结构参数,数值计算与试验结果吻合良好,表明分析环空流体吸入式自激振荡脉冲射流性能,优选调制元件结构的方法可行。所得结论可作为射流调制元件结构设计和优化的依据。The pulsed jet drilling technology with suck-in annulus fluids was proposed to take full use of the bottom-hole hydraulic power and to promote the rate of penetration.The numerical method was adopted together with lab experiments to analyze the effect of structural parameters change on the rock-breaking performance of the self-excited pulsed water jet with suck-in annulus fluids.It was found that the bigger the pressure difference between the inlet and the outlet of the oscillation cavity is,the better the rock-breaking effect will be obtained.There is a good linear correlation between the pressure difference and the rock-breaking depth.The multi-factor orthogonal experiments were carried out and the pulsed structure was optimized according to the pressure difference.Simulation results are in good agreement with the rock-breaking experiments,which indicates that structure optimization of self-excited pulsed jet with suck-in annulus fluids is feasible.The research gives a basic for the design and optimization of the pulsed water jet structure.

关 键 词：自激振荡 环空吸入 数值模拟 射流破岩 结构设计 

分 类 号：TE248[石油与天然气工程—油气井工程]