深水钻井隔水管单根基本参数确定方法

摘要

提出利用各种力学准则确定深水钻井隔水管单根基本参数的方法,包括单根主管与辅助管线参数、浮力块参数、隔水管接头参数等.结果表明:确定隔水管单根主管基本尺寸主要有环向应力准则、轴向应力准则和挤毁压力准则,根据环向应力准则得到的结果最保守；确定辅助管线参数主要依据等效应力准则；确定浮力块参数主要是合理确定浮力块的外径和密度；隔水管接头等级确定要依据规范考虑不同载荷工况进行选型设计.外径0.5334 m,内径0.488 95 m的隔水管可应用于1.830 km深的水域,且隔水管系统中无须配置填充阀,辅助管线设计合理,浮力块选用3种密度可满足工作水深的需要,选配E级隔水管接头可满足使用要求.%A method for determining the basic parameters of deepwater drilling riser single was proposed, which includes determination method of parameters for main pipe and auxiliary lines, buoyancy modules, and classification of the riser connector. The results show that the circumstantial stress, axial stress and collapse pressure criterion can all be used to determine the dimension of the main pipe. However, the results based on the circumstantial stress criterion are more conservative, and equivalent stress criterion can be used to determine the parameters of the peripheral lines of the joint. Depending on water depth, the outside diameter and density of the buoyancy modules should be determined reasonably, and the classification of the riser connector should be checked in different load cases according to API codes. The riser joints with the outside diameter of 0. 533 4 m and inside diameter of 0.488 95 m can be operated in water depth of 1. 830 km, and the fill valve is not necessary to the riser system. The design of peripheral lines and riser clamps meets the requirement of strength and stability. Three kinds of buoyancy modules meet the needs to the water depth, and matching E-class riser connector meets the requirements.