对于超深、高温、高压以及高产等复杂工况的气井,前人推导的管柱屈曲行为经典理论公式无法完整或准确地描述油管柱底部非均匀或非完整的正弦屈曲或螺旋屈曲形态。为此,采用ANSYS软件,建立了超深井全井筒油管柱屈曲行为分析的有限元力学...对于超深、高温、高压以及高产等复杂工况的气井,前人推导的管柱屈曲行为经典理论公式无法完整或准确地描述油管柱底部非均匀或非完整的正弦屈曲或螺旋屈曲形态。为此,采用ANSYS软件,建立了超深井全井筒油管柱屈曲行为分析的有限元力学模型,并以塔里木油田某超深井为例,针对管柱屈曲行为开展了油管柱屈曲形态与其横向位移、油管—套管接触压力分析。结果表明:(1)所建立的高温高压深井超深井油管柱屈曲分析有限元模型可以对油管柱屈曲形态进行全井段分析,复杂力学工况下的油管柱中和点到封隔器处的油管柱处于非均匀或非完整的正弦屈曲或螺旋屈曲;(2)油管柱底部轴向压力为205 k N时,油管柱接触段的顶部和底部分别发生正弦屈曲、螺旋屈曲自锁现象,该自锁现象可能导致油管柱处于永久性的屈曲状态。结论认为,所建立的模型可用于分析油管—套管屈曲过程中的屈曲形态、接触压力及其摩擦力,为油管柱屈曲形态、摩擦损伤失效分析及预防措施制定等提供了方法和依据。还提出了延长管柱使用寿命的措施建议:油管柱坐封前在井口施加适当的提拉力、增加底部油管柱结构尺寸、提高井口油压或适当降低产量等。展开更多
Thermal buckling response of functionally graded plates is presented in this paper using sinusoidal shear deformation plate theory (SPT). The material properties of the plate are assumed to vary according to a power l...Thermal buckling response of functionally graded plates is presented in this paper using sinusoidal shear deformation plate theory (SPT). The material properties of the plate are assumed to vary according to a power law form in the thickness direction. Equilibrium and stability equations are derived based on the SPT. The non-linear governing equations are solved for plates subjected to simply supported boundary conditions. The buckling analysis of a functionally graded plate under various types of thermal loads is carried out. The influences of many plate parameters on buckling temperature difference will be investigated. Numerical results are presented for the SPT, demonstrating its importance and accuracy in comparison to other theories.展开更多
文摘对于超深、高温、高压以及高产等复杂工况的气井,前人推导的管柱屈曲行为经典理论公式无法完整或准确地描述油管柱底部非均匀或非完整的正弦屈曲或螺旋屈曲形态。为此,采用ANSYS软件,建立了超深井全井筒油管柱屈曲行为分析的有限元力学模型,并以塔里木油田某超深井为例,针对管柱屈曲行为开展了油管柱屈曲形态与其横向位移、油管—套管接触压力分析。结果表明:(1)所建立的高温高压深井超深井油管柱屈曲分析有限元模型可以对油管柱屈曲形态进行全井段分析,复杂力学工况下的油管柱中和点到封隔器处的油管柱处于非均匀或非完整的正弦屈曲或螺旋屈曲;(2)油管柱底部轴向压力为205 k N时,油管柱接触段的顶部和底部分别发生正弦屈曲、螺旋屈曲自锁现象,该自锁现象可能导致油管柱处于永久性的屈曲状态。结论认为,所建立的模型可用于分析油管—套管屈曲过程中的屈曲形态、接触压力及其摩擦力,为油管柱屈曲形态、摩擦损伤失效分析及预防措施制定等提供了方法和依据。还提出了延长管柱使用寿命的措施建议:油管柱坐封前在井口施加适当的提拉力、增加底部油管柱结构尺寸、提高井口油压或适当降低产量等。
文摘Thermal buckling response of functionally graded plates is presented in this paper using sinusoidal shear deformation plate theory (SPT). The material properties of the plate are assumed to vary according to a power law form in the thickness direction. Equilibrium and stability equations are derived based on the SPT. The non-linear governing equations are solved for plates subjected to simply supported boundary conditions. The buckling analysis of a functionally graded plate under various types of thermal loads is carried out. The influences of many plate parameters on buckling temperature difference will be investigated. Numerical results are presented for the SPT, demonstrating its importance and accuracy in comparison to other theories.
