深水钻井隔水导管挠曲方程和固有频率的计算及其研究

Calculation and research on deepwater drilling riser flexural equation and natural frequency

从深水钻井应用的隔水导管的使用实际情况出发,应用弹塑性力学中的位移复分原理的Ritz法,考虑了隔水导管所受到的轴向张力T和隔水导管受力产生的倾角α以及由于自重q所产生的自重横向分力qsinα和轴向分力qcosα,建立了较为合理的挠曲方程,并且由此得到隔水导管的固有振动频率的简易计算求解方法。由于该挠曲方程结合了钻具的实际情况,其挠曲方程的约束条件采用的是一端铰支、一端自由的形式,因此其研究更接近实际情况,研究旨在为深水钻井隔水导管的合理使用设计和选择,提供一种更快捷实用的方法,对深水钻井作业有一定的指导意义。

Flexural equation was established in this paper,which was based on application of deepwater drilling riser and Ritz methods in elastoplastic mechanics.Axial tension,inclination angle,lateral gravity components and axial gravity components were considered.Therefore,simple calculation method for natural frequency of drilling riser was achieved.Free-hinged beam was taken as constraint condition of flexural equation combined with drilling string real conditions,which made research approach practical work more.Purpose of research was to provide reasonable design and selection for deepwater drilling riser,and provide a more efficient and applied method,which would show guiding significance for deepwater drilling operation.