leaning line

Based on assumptions of buckling behaviors of coiled tubing in straight deviated wells, the formula of bending stain energy, the formula of work done by the external force and the formula of work done by the weight component have been derived from the basic mechanical theories.

在假设连续油管初始形态为正弦形态,受外载发生屈曲后由正弦形态变成螺旋屈曲形态的基础上,推导得出在斜直井中考虑残余应变的连续油管螺旋屈曲载荷计算新公式。

Based on the theory of large spatial deflection of elastic rod,this paper sets up a differential equilibrium equation governing tubulars constrained in inclined wellbores in convected coordinate system.

利用弹性杆的大变形理论,在拖带坐标系下建立了斜直井孔约束下钻柱的平衡微分方程。

A method for lateral buckling analysis of tubing with frictional resistance in deviated wells was presented.

提出了在斜直井中钻柱正弦屈曲分析时对摩擦阻力的处理方法,给出了考虑摩擦阻力时的屈曲平衡方程,建立了相应的微分求积法列式,用微分求积法时平衡方程直接求解。

A method for nonlinear finite element analysis of the he lical buckling of tubing in deviated wells is presented for the first time, and i t is used to treat the item of the gravity.

建立了斜直井中有重钻柱螺旋屈曲非线性有限元分析方法 ,提出了对重力相关项的处理方法 ,在力学模型中考虑了重力、扭矩和井斜角对临界载荷的影响 ,并将计算结果与理论分析做了比较。

A finite element incremental weighted iteration method, which can avoid divergency and speed up the convergence process,was proposed to solve the problems of tubing buckling in deviated wells.

建立了直井中有重钻柱非线性屈曲平衡方程及相应的泛函表达式 ,构造了一种能避免发散并加速收敛的有限元增量加权迭代法求解斜直井中钻柱屈曲问题 ,首次采用直接求解非线性特征值的方法来分析钻柱屈曲问题。

The entire buckling process of tubing in deviated wells is analyzed for the first time by utilizing the finite element method.

建立了直井中钻柱屈曲的平衡方程及对应的泛函表达式 ,并首次采用有限元法对斜直井中钻柱屈曲的整个过程进行了分析。

Experimental imitation of tubular buckling parameters in slant well;

斜直井眼中管柱变形参数仿真实验

A mathematical model and a method to design the bit walk path for a slant well are presented in this paper.

提出了斜直井方位漂移轨道的数学模型和设计方法 ,其设计结果不仅可以给出井口处的方位超前角 ,而且可以得到方位漂移轨道上各点诸参数的设计值。