具有裂纹损伤桩腿的海洋石油平台有限元分析

采用有限元分析方法和断裂力学方法,将含裂纹构件的裂纹以线弹簧处理,建立了带有裂纹损伤桩腿的等效梁和管单元的单元刚度矩阵的计算方法。对检验方法的正确性,使用该方法对几种损伤构件进行了强度计算,并与有限元细化网格计算结果和实验结果进行比较,最后将等效单元计算程序接入大型有限元程序ＳｕｐｅｒＳＡＰ,对受损后的平台整体结构进行了应力计算和强度分析。     

Dynamic Response Analysis of Interaction System of R.C. Gravity Single-Leg Platform

In this paper, the responses of the interaction system of R.C. gravity single-leg platform to seismic excitation are mainly analysed. A set of nonlinear equations for the interaction system are established by using the wave, one is the soil-structure interaction and the other is the fluid-structure interaction. The seismic response of the interaction system is analysed for the influence of the asymmetric structure, fluid action, etc. with the input of seismic SH waves in any direction. The numerical results are given for a simple example.     

Finite Element Analysis of Deformed Legs of Offshore Platform Structures

The element stiffness matrix of the equivalent beam or pipe element of the deformed leg of the platform is derived by the finite element method. The stresses and displacements of some damaged components are calculated, and the numeri-cal solutions agree well with those obtained by the fine mesh finite element method. Finally, as an application of this method, the stresses of some platform structures are calculated and analyzed.     

桩基导管架平台的非线性分析

本文对渤海八号桩基导管架平台进行了非线性倒塌的分析，分别给出了导管架平台八倍固支计算模型和考虑桩土非线性计算模型的结构倒塌极限载荷及倒塌破坏过程     

Nonlinear Analysis of Pile Foundation Jacket Platform

In this paper,the nonlinear collapse of the BOHAI-8 pile foundation jacket platform hasbeen analyzed.The ultimate load and collapse process of two computational models of the structure aregiven.One model is of fixed support whose length is eight times the pile leg diameter and the other consid-ers the nonlinearity of the soil-pile interaction.     

Analytical solution on the surge motion of tension-leg twin platform structural systems

In this study the wave induced surge motion of a twin platform of a pretension leg structural system is investigated. A set of equations along with boundary conditions are derived, and solutions are obtained analytically. The tension-legged twin platform structural system might better represent a platform system in the practical application in either idealized two-dimensional analysis or actual three-dimensional practice than a single platform system. In the analysis the coupling problem of a two-dimensional tension leg twin platform interacting with a monochromatic linear wave train in an inviscid and incompressible fluid is considered. The problem is considered as a combination of the scattering and radiation. These two boundary-value problems are first solved independently and then combined together to resolve for all unknowns. The analysis is focused on the wave induced surge motion of the twin platform and the reflection coefficient. Other than the wave-related parameters, the dimensional effect of the twin platform structure is examined and presented in numerical examples. From the analytical results, it is found that the behavior of the tension-leg twin platform is significantly influenced by dimensional factors of the platform system such as the dimension of each single platform and the spacing between two platforms. It is also realized that to simplify the analysis of a twin platform system into a single platform, it tends to underestimate the wave-induced response and then reduces the safety of the platform system.     

深海观测平台技术

介绍了深海观测平台的重要性,以及国内外在此项技术上的发展现状,并提出了一套深海观测平台技术的设计构想以及对于未来发展方向的建议和展望。     

胜利埕岛油田单井拉油平台的设计浅析

胜利埕岛油田自1993年正式产油以来,已经建成简易式的单井拉油平台10多座,无论是设计、建造和施工还是运行管理都积累了许多成功的经验,根据多年来从事的浅海简易式拉油平台设计经验,结合目前埕岛油田该种类型平台的现况,从设计构思的角度着重阐述了平台结构形式的确定、平台方位的选择、平面布置、系统配套以及安全、环保、救生等系统的设置,以期为今后该种类型平台的设计提供一个较完整的思路。     

海岸基/平台基海洋自动监测系统功能特性

本文论述了海岸基／平台基海洋环境自动监测系统主要技术指标，功能特性，系统组成，考核目标，国外研究动态，研制中解决的关键技术问题和技术创新，技术成果水平评价，课题试验情况。     

具有结构-桩-土相互作用的海洋平台结构体系承载能力的概率分析

本文研究了桩在竖向荷载和横向荷载作用下承载能力的计算模型,给出了单桩承载能力的概率分析以及不同支承条件对海洋平台结构体系承载能力的影响;提出了具有结构－桩－土相互作用的海洋平台结构体系承载能力的概率特性和在极端荷载作用下海洋平台结构体系的可靠度计算方法。研究结果表明：对于桩支承海洋平台结构体系的承载能力,结构－桩－土相互作用的影响是不容忽视的,其偏差影响取决于土性的离散度。     

自升式平台拖航稳性研究

本文计算了各类自升式平台在不同拖航操作状态下的稳性，并根据计算结果分析研究了这些操作的利弊。本文可供自升式平台设计、操作和检验者参考     

就位抛砂对CB151井场及坐底式采油平台基础沉降的影响

由于埕岛油田近岸区井场地质条件复杂 ,要求坐底式平台每一次就位作业时 ,必须进行抛砂平整 ,从而导致地层土力学性质变化 ,并对下一次坐底式平台安全就位产生影响。以 CB1 5 1井场的典型资料为例 ,介绍了近岸海域井场的一般地形、地貌特征及工程地质条件差异 ,通过对坐底式平台基础沉降的分析 ,计算了坐底区、抛砂区、正常 (自然 )区 3种类型海底在外界因素作用下可能发生的沉陷量 ,总结了该类井场的一般特点 ,并对今后的坐底式平台就位作业提出了措施与建议     

Hydrodynamic response of a pneumatic floating platform

This paper describes a numerical approach to model the dynamic response of a pneumatic floating platform, and the laboratory experiments and parametric study to verify the numerical results. The pneumatic platform is composed of an array of open-bottom vertical cylinders trapping pressurized air that displaces the water. The cylinder diameter is assumed to be small compared to the wavelength and the water inside each cylinder oscillates as a piston. These assumptions simplify the mathematical formulation in that the bottom of the platform can be treated as a continuous surface on which the source distribution method can be applied. In the laboratory experiments, the compressibility and displacement of the trapped air are modeled by a spring and float assembly. The comparison between the numerical and experimental results indicates favorable agreement. The oscillation of the water columns and the overall dynamic characteristics of the platform are illustrated and discussed in the parametric study.     

基于实测动冰力时程的海洋平台结构冰振反应分析

冰激平台结构振动是影响渤海石油钻采平台冬季正常生产和安全的主要因素。本文采用实测冰压力时程,对渤海辽东湾北部的ＪＺ２０－２ＭＵＱ平台结构进行了冰振反应分析,计算了不同设计冰厚、不同冰作用方向和标高及平台桩腿有无正倒锥体（一种破冰装置）的结构反应,探讨了正倒锥体对减轻冰力和结构反应的作用,发现了结构冰激振动的一些特征,为在该平台上实施振动控制方案提供了依据     

Study on Dynamic Characteristics of Hydraulic Pumping Unit on Offshore Platform

A new technology of offshore oil rod pumping production is developed for offshore heavy oil recovery. A new type of miniature hydraulic pumping unit with long-stroke, low pumping speed and compact structure is designed based on the spatial characteristics of offshore platforms. By combining the strengths of sinusoidal velocity curve and trapezoidal velocity curve, a kinematical model of the acceleration, the velocity and displacement of the pumping unit''s hanging point is established. The results show that the pumping unit has good kinematic characteristics of smooth motion and small dynamic load. The multi-degree-of-freedom dynamic model of the single-well pumping unit is established. The first and second order natural frequencies of the sucker rod string subsystem and the pumping unit subsystem are studied. The results show that the first and the second order natural frequencies among the pumping rod string, pumping unit-platform subsystem and the dynamic excitation have differences over 5 times from each other, indicating that resonance phenomenon will not appear during the operation and the dynamic requirements for field use are met in the system.     

A single mooring system with sag-extensibility and flexural rigidity applied to offshore platform

Floating platform system has been extensively used in ocean exploitation, particularly for a tension-leg platform (TLP) system in deep water. Most of the TLPs are multi-mooring systems, where multi-joints are connected to the tension-legs so that the platform is not allowed to twist freely and may subject to enormous force induced by large incident waves in the weak-direction of the structure. This study aims to exploit a single moored offshore platform system that may attract less force and can be operated with less effort. In our analysis, in addition to mechanical properties of the tether, two important properties are also taken into consideration for the single mooring tether with expanded cross sectional dimension and utilization of stronger material, namely, the sag-extensibility and the flexural rigidity. Finally, the dynamic structural behavior produced by the mechanical effects on the new system is investigated and compared with that of traditional design while the wave-structure interactions of large body are also accounted for. Our study finds that the neglect of sag-extensibility or the flexural rigidity of large, strong mooring cable may result in a conservative but not necessarily safe design.     

交互式VR-Ocean虚拟海洋环境与生命仿真

从底层研究和构建一个虚拟海洋场景快速编辑平台。对平台的整体组成结构、工作流程和用户交互功能进行了设计,使用水面水下分开渲染、以方向确定路线的海洋生命路径规划以及水下刻蚀动态纹理叠加等关键技术和方法,基于VC++、OpenGL和GPU对海洋环境中海上、海面及海下各种可见要素进行3D虚拟,重点在海洋生命行为模拟、行为仿真和海洋特效动态展示。平台的运行满足实时性和交互性的各项要求。最后,还对VR-Ocean平台应用和技术拓展进行了论述和展望。     

抗冰导管架平台冰激疲劳寿命估计

基于安全寿命设计理论,论述了抗冰平台冰激疲劳寿命估计的方法,给出了谱分析和时间域分析方法的内容和流程,其中疲劳冰荷载和冰疲劳环境模型是冰激疲劳估计的两个关键问题。基于渤海冰情和冰荷载连续多年现场观测数据,初步建立了渤海JZ20-2海域海冰疲劳环境模型和锥体结构冰力谱,并利用谱分析方法,对新建的JZ20-2NW平台进行了详细冰激疲劳估计。此方法对抗冰平台的安全评估与动力分析具有一定的借鉴意义。     

热带风暴过程中珊瑚礁坪示踪砂运移的现场实验研究

１９９５年１０月在小东海珊瑚礁海岸的礁坪上进行了示踪砂运动的现场实验。本次实验对浪,流以及示踪砂采样作了同步观测。根据所获的实验数据,分析在９５１６号热带风暴天气过程礁坪上示踪砂运移的基本规律。在一级近似下,测定并计算了泥沙在波生流作用下的漂移速度与流速比因子０．００２,混合深度小于２ｃｍ。这一结果与其它已往结果相比明显小得多。     

中等水深轻张型张力腿平台型式研究

根据我国海上边际油田的分布特点，100m-300m左右中等水深范围是一个很有开发潜力的海域。运用常规技术已很难在这一海域取得更大的经济效益。而更经济有效地开发这些边际油田对我国来说具有重大意义。本文对适合我国中等水深海域国际油田开发的轻型张力腿平台型式进行了探索，提出了三种轻型张力腿平台，对其运动性能及系索张力进行了比较，以期找适合我国中深水海域边际油田开发的张力腿平台型式。