1.
Design and Analysis on Finite Element of New Type DTH Hammer Drilling with Eccentric Simultaneous Casing
新型偏心跟管钻具的设计与有限元分析
2.
Theoretical Analysis and Experimental Research of Flow Field by DTH Hammer Drilling with Simultaneous Casing Tool of JSL-30 Drill Rig;
基于JSL-30型砾石钻机潜孔锤同心跟管钻具的流场理论分析及试验研究
3.
The calculation results demonstrate the effective eccentricity and the lifting force of the upper drill string are the major influential factors.
计算结果表明，有效偏心距和上部钻柱的提升力是影响近井口套管偏磨的主要因素。
4.
combined pipe tap and drill
管用钻孔攻丝复合刀具
5.
tools to tubing substitute
钻具连接油管的接头
6.
Diamond core drilling equipment conventional system
GB/T16950-1997金刚石岩心钻探钻具设备
7.
Diamond core drilling equipment--Wire line system
GB/T16951-1997金刚石绳索取心钻探钻具设备
8.
Make Use Guide Drill Case Drill a Hole Lead to of Deviate Heart of a Drill
使用导向钻套钻孔引出的中心偏移问题
9.
Calculation of Eccentric Wellbore Pressure Drop and Air Volume Requirements in Air Drilling
空气钻井偏心井筒压力及注气量计算
10.
Pull out (or run in ) the string up to the shoe and hang it on the 5 inches pipe ram] .
起钻（或下钻）至套管鞋处，并把钻具悬挂在5”闸板防喷器上。
11.
Analysis and Optimization on Invalid Casing in Casing Drilling in Luanchuan Molybdenum Mine
栾川钼矿跟管钻进套管失效分析及优化设计
12.
A shaft on which a working tool is mounted, as in a dental drill.
心轴用于安装工具的蕊棒，如牙钻蕊棒
13.
Development of core drill equipment for combined underwater drill rammer of rock built-in pile hole
嵌岩桩孔组合潜孔锤取心钻具的研制
14.
Mechanical Analysis and Design of Coring BHA in Long Horizontal Segment
水平段大段取心钻具力学分析与设计
15.
work the pipe free
活动钻具或管柱使之解卡
16.
combined taper pipe tap and core drill
扩孔钻和锥管丝锥复合刀具
17.
Research on the Technology Issue of Down-the-hole Hammer Drilling with Casing for Complex Stratum
复杂地层潜孔锤跟管钻进工艺问题研究
18.
adjustable jaws center workpiece in a lathe or center tool in a drill.
在车床或钻孔机中心工具内的可调整中心工件。