岩石可钻性微钻头结构的分析与改进研究  

STRUCTURE ANALYSIS AND IMPROVEMENT ON STANDARD MICRO BIT USED IN ROCK DRILLABILITY TEST

作　　者：林敏[1,2] 陈红[1] 杨迎新[1,2] 陈炼[1,2] 

机构地区：[1]西南石油大学机电工程学院 [2]油气钻井技术国家工程实验室

出　　处：《钻采工艺》2017年第3期23-25,41,共4页Drilling & Production Technology

基　　金：国家自然科学基金项目(批准号:51374176;51304168);中国石油天然气集团公司科技项目(编号:2013E-3804)

摘　　要：运用PDC钻头几何学理论和分析方法,对影响岩石可钻性测定的关键因素之一——可钻性微钻头的结构合理性进行了研究,结果表明标准微钻头存在PDC齿的侧圆柱面与岩石试样的井底表面相干涉的问题。研究了微钻头的侧转角、后倾角和厚度对齿-岩干涉的影响规律,在此基础上,进行了微钻头结构的改进,得到了能避免干涉现象的PDC微钻头结构方案。Using the geometric theory and analysis method of PDC bits,it is proved in this paper that the cylindrical surface of the cutters of the standard micro bits used for rock drillability test will interfere with the bottom-hole rock surface,which will significantly affect the accuracy of rock drillability test and the decision on rock drillability grades. Study has been made on the effects of back rake angle,side rake angle,and thickness of the cutters on the interference phenomenon. And improvements on the structural parameters of the micro bit have been proposed.

关 键 词：岩石可钻性 微钻头 PDC钻头 切削齿 

分 类 号：TE921.1[石油与天然气工程—石油机械设备]