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    25 October 2016, Volume 3 Issue 5 Previous Issue    Next Issue
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     Global Strength Analysis of Offshore Spar Platforms Based on a Unified-Integrated Software System
    LI Hua-xiang
    2016, 3 (5):  269-280. 
    Abstract ( 252 )   PDF (6440KB) ( 64 )  
     This paper aims at the development of a unified-integrated software system for the engineering design of offshore spar platforms, which can implement the chain-work, i.e., hull design, analysis, and code verification. By means of computer aided engineering (CAE), the chain-work of the engineering design of offshore platforms can be automatically carried out. Then, based on the integrated software system, the global strength of a truss spar platform is analyzed. The analysis involves parametric finite element modeling, mapping of hydrodynamic loads to structural models, finite element analysis, yielding strength verification, and buckling calculation and verification. The results indicate that the most dangerous part of a truss spar platform under the condition of operation load cases comes from the intersections of hard tank-truss and soft tank-truss.
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     Several Points to Be Considered for Structural Design of Offshore Semi-Submersible Platform
    CHEN Wen-li, LI Hong-tao, DENG Xian-feng
    2016, 3 (5):  281-286. 
    Abstract ( 294 )   PDF (3539KB) ( 101 )  
     The critical factors controlling structural design of semi-submersible platform are structural categories and design principles, norm formula scantlings design, global structural strength design, local structural strength design and tank structural design, etc., which are studied in this paper. The design methods and requirements can refer to the rules and standards of relevant classification society. The structural design process for semi-submersible platform is also summarized accordingly. This research has certain guiding significance for the structural design of semi-submersible platform.
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     Effect of Buoyancy Modules’ Bending Stiffness Behavior on Flexible Riser in Shallow Water
    ZOU Ke, CHEN Jin-long, YUAN Zhen-qin
    2016, 3 (5):  287-291. 
    Abstract ( 256 )   PDF (2926KB) ( 72 )  
     With the development of flexible pipe, the effect of bending stiffness of accessories and equipment on flexible riser has become current research focus. Based on 8 inch (1 inch ≈ 2.54 cm) flexible pipe, considering the nonlinear stiffness coupling buoyancy module with flexible pipe, we establish steep wave riser model in shallow water. Simulation is carried out using time domain analysis method in OrcaFlex software for flexible risers tension and curvature. The results are compared with another model ignoring the coupling bending stiffness. It is shown that the effect of bending stiffness is little on maximum tension result; however, the effect of bending stiffenss is more significant on the maximum curvature. More accurate results of riser configuration analysis can be obtained by considering the bending stiffness of buoyancy module riser.
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     Analysis on the Application and Key Operating Problems of Heat Medium System in FPSO
    ZHANG Rong
    2016, 3 (5):  292-296. 
    Abstract ( 198 )   PDF (3037KB) ( 80 )  
     Floating production storage and offloading unit (FPSO) is a collection of oil and gas production, storage, transmission, as well as living and power in an offshore oil and gas processing large facility. It is now the mainstream of the offshore oil and gas field development. Heating medium system is a closed system, in which the heating medium running in independent closed pipeline has the function of heat exchange. Heating medium system, with its safety, high efficiency, energy saving, etc., is widely used in FPSO. By analyzing the composition, working principle, control system, operating key issues and common failure solution of heating medium system used in FPSO, we hope to provide some support to the actual production.
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     Study on the High Pressure Oil Return of Subsea Christmas Tree Hydraulic Control System
    WANG Xi, ZUO Xin, MA Tian-ran, YE Tian-yuan, WANG Feng, LIU Hai-jun
    2016, 3 (5):  297-304. 
    Abstract ( 322 )   PDF (4034KB) ( 113 )  
     Subsea hydraulic actuator is the power unit in the hydraulic oil and gas production, which is controlled by the subsea hydraulic system. The subsea actuators and valves are influenced by the subsea hydraulic system. We introduce the hydraulic system and the subsea control module (SCM) hydraulic systems, model the return pressure in the high pressure return line, and use the SimulationX software to perform dynamic simulation. Analysis and comparative study on the simulation results verify the control system, as well as the feasibility of the simulation. This research can provide reference for the investigation of deepwater hydraulic control systems.
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     Installation Technology of New-Type Hydraulic Adjustable Manifold within 100-m Water Depth
    CUI Ning, CAO Chen-lei, GAO Chao, HUANG Xiu-long
    2016, 3 (5):  305-309. 
    Abstract ( 174 )   PDF (2857KB) ( 52 )  
     In recent years, subsea manifold has been widely researched and applied as an important equipment for oilfield development. Also, more and more existing subsea manifolds should be replaced due to aging, external damage and so on. In order to reduce the number of subsea flange connections, a new-type hydraulic adjustable manifold is used to connect with pipeline directly in Yacheng 13-1 gas field project. Using the practical application of the project, the installation technology of the new-type hydraulic adjustable manifold is introduced. This research will also serve as reference in following subsea new-type manifold installation.
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     Discussion on Matching Design Procedure and Process to Integration Construction
    HAO Meng-jiang
    2016, 3 (5):  310-314. 
    Abstract ( 179 )   PDF (3143KB) ( 66 )  
     In the field of offshore engineering, integration construction technology can save manpower, construction sites and machines etc., so as to speed up the production efficiency, reduce production costs, and improve product quality. If the design procedure and process could match the integration construction technology, then we can promote the implementation of the integration construction through optimizing the design procedure and process. According to the design characteristics and perspective of promoting construction integration, some optimization methods for the design procedureand process are put forward, so as to solve the restricting factors of the integration construction.
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     Usage of Polyester Rope in Deepwater Mooring System
    FENG Li-mei
    2016, 3 (5):  315-319. 
    Abstract ( 461 )   PDF (2937KB) ( 130 )  
     Polyester rope has been put into usage as part of mooring lines for two decades around the world. As the offshore oil and gas development in the South China Sea goes deeper and deeper, polyester rope will be widely used sooner or later. The history, composition, production process of polyester rope, as well as characteristics and specific requirements during engineering, installation and maintenance of polyester rope are described. The differences between polyester rope and wire rope mooring system design are also listed. The re-tension issues during maintenance should be discussed further if the polyester rope is planned to be used in the South China Sea. This work can provide some guidance for the usage of polyester rope in the South China Sea.
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     Abnormal High Temperature Troubleshooting Analysis of One Cylinder in Crude Oil Engine MAK 12V32
    WANG Ya-nan, ZHANG Min, ZHAO Lei
    2016, 3 (5):  320-322. 
    Abstract ( 161 )   PDF (1814KB) ( 64 )  
     Abnormal high temperature trouble happened in one cylinder of the diesel engine MAK 12V32 on a certain subsea platform in the South China Sea during the commissioning phase. Through the troubleshooting analysis of the data of crude oil engine operation, it is found that the Cyl7 exhaust temperature is too high. Then analysis of the reasons for the high temperature trouble of the exhaust gas by the comparison of pressure curve of each cylinder by using the electronic explosion pressure gauge has found that the pressure in the cylinder Cyl7 rises too slowly and the ignition is delayed. Further inspection shows that ablation phenomenon does exist in the exhaust valve itself, which can explain why the pressure curve is abnormal. Based on the above analysis, suggestions are given to avoid the ablation of exhaust valve caused by using high sulfur fuel.
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     Development and Application of Cable Laying Route Optimization Software in Offshore Oil Platform
    HUANG Tai-an, WANG Jia, ZHANG Xiao-gang, XING Lan-chang, JIA Ming-xin, JIANG Xiao-hua, LI Yu-ming
    2016, 3 (5):  323-330. 
    Abstract ( 274 )   PDF (3806KB) ( 68 )  
     In the construction of offshore oil platform, the precise positioning of cable laying route and material control is always a big challenge. To slove this problem, we can realize the cable precut on the basis of accurate calculation of cable laying route and construction length in three-dimensional (3D) model. By making secondary development based on the principle of the nodes of the cable path and PDMS, we develop the cable laying route optimization software. It uses the efficient algorithm at key nodes to make automatic cable layout, so that we can accurately calculate the cable length, effectively improve the cable route laying efficiency and save the cable material cost.
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