薄壁油井管受轴向载荷作用抗挤毁强度研究

发布时间：2018-05-09 12:30

本文选题：薄壁油井管 + 轴向载荷　；参考：《西安石油大学》2015年硕士论文

【摘要】：油管、套管等油井管在井下会受到轴向压力、外压、内压等载荷的作用。轴向压力一方面会使油井管产生轴向屈曲,另一方面会改变油井管(尤其是薄壁油井管)的横向屈曲性能(抗挤毁强度)。为此,本文运用圆柱壳体屈曲理论,将薄壁油井管作为圆柱壳体模型,推导了轴向压力和外压联合作用下薄壁油井管的屈曲方程,为薄壁油井管在轴向载荷及不同边界约束条件作用下轴向屈曲性能和横向屈曲性能(包括横向屈曲构型和抗挤毁强度)的分析提供了基础。以薄壁油井管屈曲方程为基础,分别将薄壁油井管作为两端简支、一端固支一端自由以及两端固支的圆柱壳体,选取圆柱壳体屈曲的饶度曲线试解函数,并代入简化的Donnell八阶微分方程,将所得方程化为临界应力的表达式,并通过求极小值的方法求得了轴向压力和外压联合作用下薄壁油井管轴向屈曲的临界载荷和横向屈曲的构型与横向屈曲临界载荷(抗挤毁强度)。最后,通过对圆柱壳体沿横截面圆周方向屈曲的正弦半波数m和圆柱壳体沿轴线方向屈曲的正弦半波数”取不同的值,讨论两端简支、一端固支一端自由、两端固支的薄壁油井管的横向屈曲形状。
[Abstract]:Tubing, casing and other oil well pipes are subjected to axial pressure, external pressure and internal pressure. Axial pressure will cause axial buckling of oil well tube on the one hand, and change lateral buckling performance of oil well pipe (especially thin-wall oil well tube) on the other hand. In this paper, the buckling equation of thin-walled oil well tubing under the combined action of axial pressure and external pressure is derived by using the buckling theory of cylindrical shell and taking the thin-walled oil well tube as the cylindrical shell model. It provides a basis for the analysis of axial buckling and lateral buckling (including transverse buckling configuration and compressive strength) of thin-walled oil well pipes under axial loads and different boundary constraints. Based on the buckling equation of thin-walled oil well tube, the thin-walled oil well tube is used as the cylindrical shell with simple support at both ends, free at one end and free support at both ends, respectively, and the test solution function of the buckling curve of cylindrical shell is selected. The simplified Donnell eighth order differential equation is replaced, and the obtained equation is transformed into the expression of critical stress. The critical load of axial buckling, the configuration of transverse buckling and the critical load of lateral buckling (compressive strength) of thin-walled oil well pipes under combined axial pressure and external pressure are obtained by the method of minimization. Finally, by taking different values of sinusoidal half-wave number m of cylindrical shell buckling along the circumferential direction of cross section and sinusoidal half-wave number of cylindrical shell buckling along axial direction, it is discussed that the two ends are simply supported, one end is fixed and one end is free. The transverse buckling shape of thin-walled oil well pipes fixed at both ends.
【学位授予单位】：西安石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE931.2

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