Lateral bearing characteristics of subsea wellhead assembly in the hydrate trial production engineering  

作　　者：Jing Zeng Wen-wei Xie Bei-bei Kou Jing-an Lu Xing-chen Li De-jun Cai Hao-xian Shi Ke-wei Zhang Hua-qing Liu Jin Li Bo Li 

机构地区：[1]Guangzhou Marine Geological Survey,China Geological Survey,Ministry of Natural Resources,Guangzhou 510075,China [2]Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou),Guangzhou 511458,China [3]National Engineering Research Center of Gas Hydrate Exploration and Development,China Geological Survey,Ministry of Natural Resources,Guangzhou 510075,China [4]Drilling Engineering Division,Offshore Engineering Company Limited,CNPC,Tianjin 300280,China

出　　处：《China Geology》2023年第3期455-465,共11页中国地质（英文）

基　　金：This research was jointly supported by the National Key R&D Program of China(2021YFC2800801);the Key Special Project for Introduced Talents Team of Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou)(GML2019ZD0501);the Guangzhou Basic and Applied Basic Foundation(202102020611);the project of Guangzhou Marine Geological Survey of the China Geology Survey(DD20221700);the Key-Area Research and Development Program of Guangdong Province(2020B1111030003);the High-tech Ship Research Project of the Ministry of Industry and Information Technology(CJ05N20).

摘　　要：Conductor and suction anchor are the key equipment providing bearing capacity in the field of deep-water drilling or offshore engineering,which have the advantages of high operation efficiency and short construction period.In order to drill a horizontal well in the shallow hydrate reservoir in the deep water,the suction anchor wellhead assembly is employed to undertake the main vertical bearing capacity in the second round of hydrate trial production project,so as to reduce the conductor running depth and heighten the kick-off point position.However,the deformation law of the deep-water suction anchor wellhead assembly under the moving load of the riser is not clear,and it is necessary to understand the lateral bearing characteristics to guide the design of its structural scheme.Based on 3D solid finite element method,the solid finite element model of the suction anchor wellhead assembly is established.In the model,the seabed soil is divided into seven layers,the contact between the wellhead assembly and the soil is simulated,and the vertical load and bending moment are applied to the wellhead node to simulate the riser movement when working in the deep water.The lateral bearing stability of conventional wellhead assembly and suction anchor wellhead assembly under the influence of wellhead load is discussed.The analysis results show that the bending moment is the main factor affecting the lateral deformation of the wellhead string;the anti-bending performance from increasing the outer conductor diameter is better than that from increasing the conductor wall thickness;for the subsea wellhead,the suction anchor obviously improves the lateral bearing capacity and reduces the lateral deformation.The conduct of the suction anchor wellhead assembly still needs to be lowered to a certain depth that below the maximum disturbed depth to ensure the lateral bearing stability,Thus,a method for the minimum conductor running depth for the suction anchor wellhead assembly is developed.The field implementations show that compare

关 键 词：Natural gas hydrate Deep-water Subsea wellhead Suction anchor Wellhead stability 3D solid finite element method Hydrate trial exploration engineering Natural gas hydrate trial production Shenhu area The South China Sea 

分 类 号：P744.4[天文地球—海洋科学]