可切换式反循环潜孔锤钻头设计及优化.pdfVIP

第 47卷第 2期 中南大学学报(自然科学版) Vol.47 No.2 2016年 2月 Journal of Central South University (Science and Technology) Feb. 2016 DOI: 10.11817/j.issn.1672−7207.2016.02.022 可切换式反循环潜孔锤钻头设计及优化 甘心，殷琨，彭枧明，殷其雷，何将福 (吉林大学 建设工程学院，国土资源部复杂条件钻进技术开放研究实验室，吉林 长春，130026) 摘要：针对现有气动贯通式潜孔(DTH)锤反循环钻探技术在推广应用过程中遇到的岩矿心(样)丢失、卡钻埋钻事 故时有发生等问题，提出一种可切换式反循环潜孔锤钻头的新结构，该结构在正常碎岩钻进和“强吹孔”时，可 以通过花键套的辅助配合，从而实现反循环原理上的切换。与此同时，采用正交试验设计的方法，运用计算流体 动力学(CFD)分析技术对该钻头中备用内喷孔的 6 个主要结构参数进行优化设计。研究结果表明：备用内喷孔个 数(N)对钻头的反循环效果影响最大，其次依次是备用内喷孔直径(D)、倾角(Θs)、备用内喷孔与常开内喷孔间距(L)、 水平偏角(Θd)，而备用内喷孔距孔底高度(H)对钻头的反循环效果影响最小。当N=2，D=5 mm，Θs=30°，Θd=10°， L=0 mm，H=230 mm时，钻头备用内喷孔结构参数组合最优。 关键词：可切换式钻头；潜孔锤；反循环钻进；正交设计；CFD分析 中图分类号：P634.4 文献标志码：A 文章编号：1672−7207(2016)02−0508−07 Design and optimization of switchable reverse circulation DTH air hammer bits GAN Xin, YIN Kun, PENG Jianming, YIN Qilei, HE Jiangfu (School of Construction Engineering, Laboratory of Technology for Drilling under Complex Condition of Ministry of Land and Resources, Jilin University, Changchun 130026, China) Abstract: According to the drilling accidents such as cores lost or sticking of drilling tools in the process of popularization and the application of reverse circulation drilling technology with a hollow through Down−the−Hole (DTH) air hammer, a structure of the switchable reverse circulation drill bit was proposed. The structure can achieve the switch of reverse circulation both in normal drilling process and blowing hole operations with the assistance of spline sleeve theoretically. Meanwhile, 6 main structural parameters of the auxiliary suction nozzles in the switchable reverse circulation drill bit were optimized by computational fluid dynamics (CFD) analysis and orthogonal design method. The results show that the number of auxiliary suction nozzle (N) has the maximum influence on the performance of reverse circulation drilling, which is follo