Table of Content

    , Volume 6 Issue 3   
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    The Investigation of On-bottom Stability Protection for Huge-diameter Subsea Pipeline in Extreme Shallow Water Depth
    2019, 6 (3):  554. 
    Abstract ( 89 )   PDF (2298KB) ( 20 )  
    This paper introduces the difficulty of on-bottom stability protection for huge-diameter subsea pipeline in extreme shallow water depth. The design method of on-bottom stability is introduced, and the design method feasibility of on-bottom stability protection for huge-diameter subsea pipeline in extreme shallow water depth is compared. Based on the theoretical analysis, a integrated method of on-bottom stability protection is provided. The difficulty of on-bottom stability protection design in extreme shallow water depth is solved successfully.
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    Landing Dynamic Modeling and Analysis of Deep Seafloor Drill
    2019, 6 (3):  560. 
    Abstract ( 92 )   PDF (9912KB) ( 24 )  
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    Study on Deep Water SCR Tie-back and Installation Schemes Based on One Domestic Deepwater Development Project
    2019, 6 (3):  566. 
    Abstract ( 114 )   PDF (3886KB) ( 53 )  
    SCR is a favorable solution to deep water oil and gas development. Actual engineering requirement on SCR in domestic application is increasingly growing. One domestic deepwater development project in recent years has the plan of SCR application. Aimed at this project, three SCR tie-back and installation plans were put forward based on different operation vessels. As an example, operation procedure of one of the plans was presented generally. Applicability and economy analysis and comparisons among these three plans were also perfomed. This study has reference and guidance value on deep water SCR tie-back and installation in engineering application.
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    Management and Analysis Method for Reliability, Technical Risk and Integrity of Subsea Production System
    2019, 6 (3):  572. 
    Abstract ( 82 )   PDF (3112KB) ( 29 )  
    API 17N provides a structured approach to manage the risks and uncertainties associated with reliability and integrity performance in the life cycle of a project, from general project risk management to the identification and elimination of specific equipment failure modes. The basic method is simple and consistent. Rational use can greatly reduce the economic and safety environmental risks of underwater equipment or system design, manufacture, installation and operation. This paper mainly outlines the reasons, basic principles, methods and basic contents of API 17N compilation, and introduces the reasons for revision, as well as the contents of adjustment, such as adding integrity management. This article does not introduce the details of API 17N, but introduces the basic model and the key process. Finally, it introduces the relationship between API 17N and other API standard documents, as well as the experience learned from recent events.
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    Numerical Simulation of Submarine Cable Laying 0peration Method and Engineering Application
    2019, 6 (3):  579. 
    Abstract ( 93 )   PDF (2606KB) ( 26 )  
    Submarine cables are affected by environment loadings during the laying operation. In order to ensure the safety of the submarine cable during laying operation, accurate analysis is required to determine the dynamic response and acceptable sea conditions. Based on OrcaFlex software, a coupled vessel-cable -seabed dynamic analysis model was established, and the dynamic response of submarine cables was analyzed. The results show that the environmental loading has a significant influence on the axial tension, and as the wave height increases, the axial tension of the submarine cable increases nonlinearly. During the cable laying operations, it is important to control the operation window. This research shows that the proposed numerical simulation method is efficient and feasible for cable laying analysis, which can provide reference for the laying analysis of submarine cable in China.
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    Research on damage and risk of Collision of FPSO Boardside Risers
    2019, 6 (3):  584. 
    Abstract ( 90 )   PDF (4189KB) ( 9 )  
    Risk of the collision of FPSO boardside risers was researched by using the risk matrix method and typical collision accidents were studied about its risk level as well as solutions. Finite element models were established for the replenishment ship, FPSO boardside riser and fendering device by the nonlinear FEM software LS-DYNA. Structure damage deformation, energy absorption and transformation were abtained and then consequence level was divided. According to the historical data of relevant sea area, the frequency of ship collision was determined. The results indicated that cruising speed of the supply ship near the side riser should be controlled within 0.32m/s and the fendering device can be fairly effective to low down the risk level of ship collision.
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    Study on Wind Spectrum Model for the oil and gas field in Northern South China Sea
    2019, 6 (3):  592. 
    Abstract ( 103 )   PDF (5008KB) ( 10 )  
    In this paper, 2-year measured wind speed data in the Northern South China Sea is applied to analysis the adaptability of various wind spectrum models under different wind speeds. The results show that the wind spectrum model recommended by API coincides better with the observed wind spectrum in the northern South China Sea. While in the high wind speed condition, the API spectrum value is lower than the measured wind spectrum value in the low frequency region. Meanwhile, the measured data is used to modify the parameters of API wind spectrum model, and modified API wind spectrum is improved in the low frequency region. The research results of this paper can provide a reference for ocean engineering design in the South China Sea, and give a support for the study of wind spectrum in the South China Sea.
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    Review and Prospect of Long-term Deep-sea Sampling Technology
    2019, 6 (3):  599. 
    Abstract ( 98 )   PDF (602KB) ( 22 )  
    This article reviews the development of deep-sea sampling technology. Samplers for sediment and water have been widely applied on deep-sea geological and biological research. To preserve the original form of the samples, long-term sampling technology as thermal insulation and pressure retention have been taken into consideration. Meanwhile, the deep-sea manned vehicle has been largely developed during the recent decades, which provides an in-situ platform for storing and processing samples. Hence, this article further proposes a state-of-the-art idea of long-term deep-sea sampling by Remote Operated Vehicle (ROV).
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    Research and Development Progress of Offshore Mooring Chain
    2019, 6 (3):  603. 
    Abstract ( 155 )   PDF (1843KB) ( 71 )  
    Mooring chain is an important component of mooring system to maintain the safety of offshore units. As the offshore industry heading out to deeper water and facing various extreme weathers, the design code and standards became stricter to ensure the performance and reliability of mooring chain. Meanwhile, the study on the mooring chain has become hot spot of the industry. This paper introduces the research and development progress of offshore mooring chain from basic properties to fatigue and corrosion performance. It also provides references for the designer and user of mooring chain by summarizing the latest research results.
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    Study and Discussion on Localization of Shutdown Valve on Offshore Production Platform
    2019, 6 (3):  610. 
    Abstract ( 139 )   PDF (980KB) ( 25 )  
    This paper summarizes the key technical requirements of localization of emergency shutdown valve on offshore platform, also analyze and study and discuss its technical challenges and design key points. In addition, this paper preliminarily proposes the standards of domestic access application, and it provides a guidance for manufactures to promote the domestic research of emergency shutdown valve on offshore platform, and it also provides a reference for users to formulate the domestic application access procedure.
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