drill string

The rule of hook load and friction coefficient is applied to enhance predictive accuracy of frictional drag in new area or different BHAs and heighten utilization ratio of frictional drag. Drag theory can be combined with practice, and drill string mechanics analysis system is supplemented.

利用钩载和摩阻系数的规律性，能够提高新区块或者不同钻具组合摩阻预测的准确性，增强现场施工摩阻的利用率，达到理论结合实际，丰富完善钻柱力学分析体系的目的。

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Drill string design of drilling complex formations and its application technique study

复杂地层钻井的钻柱设计及使用技术研究

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This paper presents the and trend of drill string vibration analysis technique abroad and at home.

该文概括了钻具振动分析技术的国内外发展概况及其在我国的应用前景.

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Practice has proved that, Ansys drill string torsional vibration analysis results really have higher economic value, significant effect, and can improve the quality of engineering greatly.

实践证明，Ansys钻杆柱扭转振动分析成果具有较高的经济价值，极大地提高了钻探工程的质量，效果显著。

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Analyzing the stability of horizontal drill string by using matrix transfer method

用矩阵传递法分析水平钻柱的稳定性

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Analysis and Calculations of Axial Deformation of Drill String in Borehole Plan

设计井眼中钻柱轴向变形分析与计算

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The force analysis of the drill string is carried out to obtain the calculation formulas of its axial stress, bending stress, torsion stress, radial stress, circumferential stress and additional shearing stress.

通过钻柱受力分析，给出钻柱轴向应力、弯曲应力、扭转应力、径向和周向应力，以及附加剪应力的计算公式。

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The results of research in this article would provide a theoretical and arithmetic method for the fluid-structure interaction analysis of the rotary slender shaft, the stirring shaft in the chemical engineering machinery and the rod string and drill string in the oil drilling and production engineering.

本文研究成果可为化工机械中的细长旋转轴和搅拌轴、石油钻采工程中的抽油杆柱和钻柱的固液耦合分析提供了理论基础和计算方法。

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It is an inside BOP ( blowout preventer) in the drill string.

投入式止回阀是钻柱内防喷器。

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Electrically driven rotary sidewall sampler ANALYSING DYNAMIC CHARACTERISTICS OF DRILLING STRING EDDY OF INSIDE CONTAINING DRILL FLUID

电动钻进式井壁取心器内含钻井液的钻柱涡动动力特性分析

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Although the structure of drill string seems simple, it bears rather complicated outside force.

虽然钻杆柱在结构上看似较为简单，但实际上，它承受着相当复杂的外力。

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Drill string vibration was analyzed based on vibration theory and finite element method.

根据振动理论和有限元方法，研究了钻柱振动的模态。

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In the paper, Based on the theory of compound crack and fracture mechanics and surface liner cracks of drill string often occurring in process of production and application, a fatigue life model of drill string under the interaction of torsion and axial vibration is established.

根据复合型裂纹扩展理论和断裂力学方法，以及钻柱在生产和应用中的表面线性裂纹现象，提出了钻柱在扭转、纵向振动下的疲劳寿命计算模型。

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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

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Computer Simulation of Drill String, Bit and Rock System

钻柱、钻头与岩石系统计算机仿真

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Gap element method for frictional resistance analysis of whole drill string in prospecting horizontal well

探井水平井整体钻柱摩阻力分析的间隙元法

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Study on measurement system for dynamic characteristics of drill string's bottom

钻柱近钻头力学特性测量系统功能研究

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The definition of two special points of drill string and calculation methods

弹性钻柱两个特殊点的意义及计算方法

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Rule and Application about Drill String Vibration of Extend Reach Well

大位移井钻柱振动规律及其应用

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Measurement Method and Experimental Research on Dynamic Force Behavior of Bottom Drill String counterbore with guide

底部钻柱动态力学特性测量方法与实验研究有导柱的平底扩充孔钻

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Study on Information and Power Transmission Based on An Intelligent Drill String

智能钻柱信息及电力传输系统的研究

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The Acquisition System For Drill String Vibration Signals And The Spectrum Analysis

钻柱振动信号采集系统及谱分析

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Always slip and cut the drilling line with the drill string in the cased hole and the bit is at or near the casing shoe.

滑大绳或者倒大绳时，一定要把钻具下到套管内，使钻头处在或接近套管鞋。

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Mechanism Analysis and Preventive Measures of Drill String Washout Caused by Corrosion

腐蚀引起钻柱刺漏的机理分析及预防措施

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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

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Convolution Method of Analysing Drill String Test Pressure Restoration

DST压力恢复分析的卷积法

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Drill string receives the complicated stress which is tension-compression stress, torsion stress, bending stress, etc.

在长期工作中，钻具承受拉伸、压缩、弯曲和扭转等复杂应力。

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The Application of Analytical Technology for Drill String Stress Wave Spectral

钻柱应力波频谱分析技术的应用

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Mechanics model for lengthwise vibration analysis of deep well drill string is established.

本文以整体钻柱为研究对象,建立了深井钻柱纵向振动分析的力学模型.

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Analysis of Buoyant Force and Calculation of Axial Force of Drill String

钻柱的浮力分析及轴力计算

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