海底浅层土壤对典型深水海底井口系统影响的数值研究

IF 3.9 4区 工程技术 Q1 ENGINEERING, MARINE Brodogradnja Pub Date : 2022-07-01 DOI:10.21278/brod73301
Xingkun Zhou, Jinghao Chen, Zhengguang Ge, Tong Zhao, Wenhua Li
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引用次数: 1

摘要

在极端海况和作业条件下,深水海底井口可能会受到严重威胁,尤其是当海床由非常软的粘土组成时。利用ANSYS的经典海洋管单元和非线性弹簧单元,建立了深水井口系统的数值模型,研究了不同海底土壤中海底井口的行为。APDL语言中编码的非线性弹簧单元用于对三种类型的海底土壤进行建模:非常软的土壤、软的土壤和坚硬的土壤。特别深入研究了钻井隔水管系统典型耦合和解耦模型中井口系统的动态和准静态行为。采用时域和极值分析方法,真实模拟了非线性海底土壤特性对详细井口的影响。结果表明,海底土壤越软,深水海底井口的位移、转角、曲率和弯矩越大。当海底土壤达到特定深度时,井口在三种海底土壤条件下的力学特性几乎同时接近于零。总之,本研究得出的几个结论可能为设计和稳定性分析提供一些有用的参考。
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NUMERICAL INVESTIGATIONS ON THE EFFECTS OF SEABED SHALLOW SOILS ON A TYPICAL DEEPWATER SUBSEA WELLHEAD SYSTEM
Deepwater subsea wellheads may be significantly threatened under extreme sea conditions and operations, especially when the seabed is composed of very soft clay properties. A numerical model of a deepwater wellhead system is established using the classic ocean pipe element and nonlinear spring element of ANSYS to examine the behaviors of subsea wellheads in diverse seabed soil. Nonlinear spring elements coded in the APDL language are used to model three types of seabed soils: very soft soil, soft soil, and firm soil. The dynamic and quasi-static behaviors of the wellhead system in the typical coupled and decoupled models of the drilling riser system are particularly investigated in depth. The effects of the nonlinear seabed soil properties on the detailed wellhead are realistically simulated using time domain and extremum analysis. The results show that the softer the seabed soil, the greater the displacement, rotation angle, curvature, and bending moment of deepwater subsea wellheads. When the seabed soil reaches a particular depth, the mechanical characteristics of the wellheads under the three types of seabed soil conditions are almost simultaneously close to zero. Overall, several conclusions reached in this study may provide some useful references for design and stability analysis.
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来源期刊
Brodogradnja
Brodogradnja ENGINEERING, MARINE-
CiteScore
4.30
自引率
38.90%
发文量
33
审稿时长
>12 weeks
期刊介绍: The journal is devoted to multidisciplinary researches in the fields of theoretical and experimental naval architecture and oceanology as well as to challenging problems in shipbuilding as well shipping, offshore and related shipbuilding industries worldwide. The aim of the journal is to integrate technical interests in shipbuilding, ocean engineering, sea and ocean shipping, inland navigation and intermodal transportation as well as environmental issues, overall safety, objects for wind, marine and hydrokinetic renewable energy production and sustainable transportation development at seas, oceans and inland waterways in relations to shipbuilding and naval architecture. The journal focuses on hydrodynamics, structures, reliability, materials, construction, design, optimization, production engineering, building and organization of building, project management, repair and maintenance planning, information systems in shipyards, quality assurance as well as outfitting, powering, autonomous marine vehicles, power plants and equipment onboard. Brodogradnja publishes original scientific papers, review papers, preliminary communications and important professional papers relevant in engineering and technology.
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