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A new finite element method in analyzing mechanical properties of sucker rod strings in 3D directional wellbores
Author(s): 
Pages: 1018-1023
Year: Issue:  6
Journal: Acta Petrolei Sinica

Abstract: 结合定向井井眼轨迹的三维空间特征和超细长杆柱在井眼中的双重非线性(接触非线性和几何非线性)特征,同时考虑Rayleigh阻尼及液体摩擦影响,建立了抽油杆柱三维动态有限元方程.利用Newmark法对抽油杆柱运动过程进行时间域离散,采用结点迭代的循环求解方法对三维动态有限元方程进行了数值求解,并用直接约束法对杆/管接触问题进行了处理,得到了抽油杆柱每一结点6个自由度方向的变形和载荷.以实测井底泵功图为...
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