ANSYS-based finite element analysis method of longitudinal vibration of drilling string and its application;
基于ANSYS的钻柱纵向振动有限元分析及应用
Rules and their application of drilling string lateral vibration;
钻柱横向振动规律及应用
Optimization design methods of drilling strings in extended reach wells;
大位移井钻柱优化设计方法及应用
Study of contact force between drill string and borehole wall in constant-curvature wellbores;
等曲率井眼中钻柱与井壁间接触力分析
Calculation and analysis of fatigue strength of drill string in deep well;
深井钻柱疲劳强度计算与分析
Study of vortex mechanism and rule of bottom drill string;
下部钻柱涡动机理及规律研究
Dynamic simulation of the contact between drill stem and well wall;
钻柱与井壁接触的动态仿真分析
The calculation of critical compressive force of drill stem in horizontal well;
水平井眼中受压钻柱的临界载荷计算
The effect of initial deflection on nonlinear lateral vibration of drill stem;
初弯曲对钻柱横向非线性振动的影响
Study on Dynamic Characteristics and Failure Mechanism of Drill String in Air Drilling
气体钻井钻柱动力学特性及钻柱失效机理研究
ANALYSING DYNAMIC CHARACTERISTICS OF DRILLING STRING EDDY OF INSIDE CONTAINING DRILL FLUID
内含钻井液的钻柱涡动动力特性分析
The rotary carriage provides rotary and vertical motion to the drill string and bit.
转动滑架为钻柱和钻头提供转动和垂直移动。
Acoustic Transmission and Measurement Method for Near-bit Dynamic Force Signal of Bottom Drill String
底部钻柱近钻头动态力测量及声传输方法
Analysis of Frictional Effect on the Drill Stem Stability in Horizontal Wells
考虑摩擦时水平井钻柱的稳定性分析
AUTOMATIC METHOD OF DST ANALSIS
非自喷井钻柱测试解释的自动拟合法
Solve the Nonlinear Contacted Problem between Drillstring and Hole Wall by the Optimization Method;
最优化理论求解钻柱接触非线性问题
Effects of Drillstring Length on Snake Buckling Loads
斜直井内钻柱长度对蛇形屈曲的影响
Development of Drill String Vibration Logging
钻柱振动录井的研究现状及发展趋势
the cutting part of a drill; usually pointed and threaded and is replaceable in a brace or bitstock or drill press.
钻机的切割部分；通常是尖头的有螺旋状图案并且可以更换，用在钻柱钻柄或钻床上。
Study on Nonlinear Dynamics Action of Integrated Bit-Rock-Drillstring-Well System;
钻头—岩石—钻柱—井壁互作用下系统耦合非线性动力学研究
A Research on the Logging While Drilling Acoustic Data Transmission Based on Periodic Drill String System
基于周期性钻柱系统的随钻数据声波传输方法研究
Simulation the Acoustic Characteristic of Periodic Drill String of Logging while Drilling
随钻测井周期性钻柱结构声传播特性的数值仿真
counterbore with guide
有导柱的平底扩充孔钻
bottom supporting drilling platform
定柱沉垫式钻井平台
new series vertical drilling machines with square colum
新系列方柱立式钻床
cone type roller bearing rock bit
滚柱轴承锥形牙轮钻头
DISCUSSION OF TECHNOLOGY FOR DISPLAYING THE BORE STRATA HISTOGRAM IN-PHASE WITH DRILL
钻进时同步显示钻孔地层柱状图技术探讨