西藏安多县多才玛矿区强研磨性地层孕镶金刚石钻头使用效果分析  

Effect Analysis of the Impregnated Diamond Bit in Strong Abrasive Strata of the Duocaima Mine Area,Andu County,Tibet

作　　者：刘海声 汪洪民 刘鹏 张俊才 高元宏 康鑫 穆元红 LIU Haisheng;WANG Hongming;LIU Peng;ZHANG Juncai;GAO Yuanhong;KANG Xin;MU Yuanhong(Second Geological Exploration Institute of Qinghai Province,Xining,Qinghai 810028;Qinghai Core Drilling Engineering Technology Research Center,Xining,Qinghai 810028;Qinghai Geological Environmental Monitoring Station,Xining,Qinghai 810008;Jinan Research Institute of Survey and Mapping,Jinan,Shandong 250101)

机构地区：[1]青海省第二地质勘查院,青海西宁810028 [2]青海省岩心钻探工程技术研究中心,青海西宁810028 [3]青海省地质环境监测总站,青海西宁810008 [4]济南市勘察测绘研究院,山东济南250101

出　　处：《地质与勘探》2019年第6期1473-1483,共11页Geology and Exploration

基　　金：青海省地矿局2018年第二批地勘项目“青海高原绿色勘查地质钻探施工标准研究”(编号:青地矿地[2018]87号)资助

摘　　要：多才玛矿区位于三江源国家自然保护区内,任务量重、施工要求高、难度大,采用现场调研法和室内试验分析法分析孕镶金刚石钻头使用效果。通过研究分析得到:多才玛矿区岩石的研磨性为5~6级,可钻性为7~8级,地层破碎程度为Ⅲ~Ⅳ级。“NQ”系列孕镶金刚石钻头在多才玛矿区施工时的最优钻压在8~11MPa之间,最优转速在1.41~2.35m/s之间。通过激光扫描共聚焦显微镜观察分析两种典型的非正常钻进过程发现,在高转速、低钻压的条件下是新鲜的金刚石面无法出刃导致机械钻速低,在高转速、高钻压的条件下发生烧钻,胎体直接与岩体接触导致机械钻速低。孕镶金刚石钻头的金刚石平均出刃高度一定程度上可以反映钻头的寿命和机械钻速的大小。The Duocaima mine area is located in the Sanjiangyuan National Nature Reserve region,where heavy tasks of exploration,high requirements to construction and great difficulties raise serious challenges.Field investigation and laboratory tests are conducted to uncover the effect of impregnated diamond bit in this area.Results show that the abrasiveness of rocks in the mine area is 5~6,drill-ability is 7~8,and formation fragmentation is 3~4.The optimum drilling pressure of NQ series impregnated diamond bits is between 8 MPa and 11 MPa,and the optimum rotational speed is between 1.41 and 2.35 m/s.Observations and analyses of two typical abnormal drilling processes by laser scanning confocal microscopy found that under the conditions of high rotational speed and low drilling pressure,the mechanical drilling speed is low due to the failure of fresh diamond surface to cut edges,drilling burning occurs under the conditions of high rotational speed and high drilling pressure,and the mechanical drilling speed is low due to the direct contact between matrix and rock mass.The average diamond cutting edge height of impregnated diamond bit can reflect the life of the bit and the penetration rate to a certain extent.

关 键 词：钻头 钻压转速 机械钻速 金刚石 出刃 

分 类 号：P634.5[天文地球—地质矿产勘探]