喷射式局部反循环钻具结构参数数值模拟  

Numerical Simulation of Structural Parameters of Jet Reverse Partial Circulation Drilling Tool

作　　者：黄帆[1,2] 梁俭 高元宏 段隆臣[1,2] 

机构地区：[1]中国地质大学(武汉)岩土钻掘与防护教育部工程研究中心,武汉430074 [2]中国地质大学(武汉)工程学院,武汉430074 [3]青海省第二地质矿产勘查院,西宁810000

出　　处：《地质科技情报》2016年第4期213-218,共6页Geological Science and Technology Information

基　　金：青海省科技厅项目(2014-GX-201)

摘　　要：喷射式局部反循环钻具的流场主要是由喷反元件的射吸效应形成。为增强喷反钻具的反循环效果,提高岩心采取率,对喷反元件的主要结构参数对反循环效果的影响规律进行了研究;采用正交试验设计方法,借助计算流体动力学CFD软件,对不同结构参数组合下喷反钻具的反循环效果指标进行了回归分析。研究结果表明,喷反装置6个结构参数对目标值的影响由大到小的顺序是:喷嘴直径D1、喷嘴个数N1、喷嘴倾斜角度θ1、承喷孔直径D2、承喷孔倾斜角度θ2、承喷孔个数N2;当冲洗液泵量为1.5kg/s(90L/min)时,喷嘴直径D1=8mm,喷嘴个数N1=8,喷嘴倾斜角度θ1=67°,承喷孔直径D2=8mm,承喷孔倾斜角度θ2=5°,承喷孔个数N2=4为最优参数组合。The flow field of jet reverse partial circulation drilling tool is mainly formed by the suction effect of jet reverse components. In order to enhance the effect of reverse circulation and improve the reverse cir- culation pumping performance, the influences of main structural parameters of jet reverse components on the reverse circulation effect were researched. The orthogonal design method and computational fluid dy- namics （CFD） simulation software were applied in regression analysis of the index of the effect of reverse circulation under the different parameters combinations. The results show that the increasing order of effect of six key structural parameters on the index of reverse circulation is the increasing order：that the di- ameter of nozzles （D1）, the number of nozzles （N1）, the inclination angle of nozzles （θ1）, the diameter of bearing nozzles （D2）, the inclination angle of bearing nozzles inclination （θ2）, and the number of bearing nozzles （N2）. When the pumping quantity reaches to 1.5 kg/s （90 L/min）, a configuration of parameters with D1 =8 mm, N1 =8, θ1 =67°, D2 =8 mm,θ2：5°, and N2 =4 are the most ideal parameter combinations.

关 键 词：局部反循环钻具 数值模拟 正交试验 喷反元件 结构参数 

分 类 号：P634.3[天文地球—地质矿产勘探]