drill assembly

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

Nonlinear finite element analysis on drillstring colloiding with wellbore;

钻柱与井壁碰撞的非线性有限元分析

Research on How to Predict the Drillstring Fatigue Life of Whole Well with Precession and Backward Precession;

考虑运动状态时全井段钻柱疲劳裂纹扩展寿命计算研究

Some problems in the recent research of drillstring bifurcation;

近期国内钻柱静动力分岔研究及存在问题

Particular attention has been focused on studying the mechanical behaviors of drillstrings, because drilling engineering takes high risk and invests heavily capital.

由于石油钻井工程的高风险和高投入,使得对钻柱的力学性能研究倍受关注。

Based on the theory of large spatial deflection for elastic slender bars, the fundamental non-linear partial differential equations of drillstrings are derived.

以弹性杆的大位移理论为基础,考虑轴向力、扭矩对弯曲变形的影响以及由于变形而引起的力及力矩的作用位置及方向的变化,采用拖带坐标建立了大位移井中钻柱耦联的非线性偏微分方程组。