波浪载荷下探井隔水导管力学特性研究

RESEARCH ON MECHANICAL CHARACTERISTICS OF DRILLING CONDUCTOR UNDER WAVE LOAD

隔水导管是自升式平台进行海上作业的基础结构。然而,循环的波浪载荷会使隔水导管产生过大的横向位移和弯矩,进而导致其失效。本文结合Morison方程以及美国石油学会(American Petroleum Institute, API)规范中的p-y曲线,建立了井口到海底的隔水导管的分段力学模型,创新性地提出了将隔水导管简化为两端简支梁的多点边值问题的求解方法,将控制方程转化为一阶微分方程组,然后通过MATLAB求解计算,验证了本文理论推导和求解的正确性,最后对影响隔水导管力学性能的关键参数进行了分析研究。所得结论进一步提高了隔水导管理论模型的计算精度和对工程设计的有效指导作用。

The conductor is the basic structure of the self-elevating platform for offshore operations.However,cyclic wave loads may cause excessive lateral displacements and bending moments in conductors,leading to its failure.This paper combines the Morison equation and American Petroleum Institute(API)specifications to establish a segmented mechanical model of the conductor from the wellhead to the seabed,and innovatively proposes a solution method for the multi-point boundary value problem that simplifies the conductor into a simply supported beam at both ends.And transform the governing equations into a system of first-order differential equations.Through MATLAB calculations,the correctness of the theoretical derivation and solution of this paper was verified.Finally,the key parameters affecting the mechanical properties of the conductor were analyzed and studied.The conclusions obtained further improve the calculation accuracy of the conductor theoretical model and provide effective guidance for engineering design.