Table of Content

    25 December 2018, Volume 5 Issue 6 Previous Issue    Next Issue
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    Design of the Habitability of Accommodation Area on the 7th Generation Ultra-Deepwater Drillship
    ZHU Guo-hua, YANG Han-kun
    2018, 5 (6):  367-371.  DOI: 10.12087/oeet.2095-7297.2018.06.01
    Abstract ( 258 )   PDF (2642KB) ( 209 )  
    Requirements on the habitability of accommodation area on the 7th generation ultra-deepwater drillship given by MLC 2006 are studied, and some measures including natural lighting and staffing for sleeping rooms, personnel sanitary facilities, arrangement of mess rooms are analyzed. Requirements on noise control presented by COMF(NOISE) 2 and COMF HEALTH-NOISE-2 class notations are studied, and noise control difficulties are analyzed. Accommodation area of the drillship is designed based on the habitability and noise control considerations finally, and noise control measures of cabins and hospital are specially discussed.
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    Discussion on Wheel House Blind Sector of Semi-Submersible  Offshore Floating Platform
    NI Hong-jian, ZHANG Zhong-lin
    2018, 5 (6):  372-375.  DOI: 10.12087/oeet.2095-7297.2018.06.02
    Abstract ( 244 )   PDF (15086KB) ( 78 )  
    The main design ideas of the visibility plan in the semi-submersible offshore floating platform are introduced. By analyzing the relevant conventions of the “SOLAS”, the influence of two factorsie., the design of the window structure and the obstacles in front of the wheel house, on the vision are studied emphasizing the importance of the vision to the safety. Besides, the contents that can be improved and optimized are discussed. Moreover, with the analysis of successful examples about solving wheel house vision problems, some related issues are further introduced.
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    Research and Application of Marine Mobile Workover Module Technology
    LI Sen, TIAN Hai-qing, FAN Dun-qiu, SHI Yong-jin, REN Hong-wei
    2018, 5 (6):  376-379.  DOI: 10.12087/oeet.2095-7297.2018.06.03
    Abstract ( 268 )   PDF (6101KB) ( 470 )  
    In order to solve the problem that the existing offshore workover platform is expensive and cannot meet the need of workover operation, the mobile workover module of the offshore platform is designed and developed. The workover module can make continuous two-way movement in the marine platform among the multiple well groups, achieve double-side workover to change the existing single-well workover mode, and implement a set of modular workover treatment equipment for multiple-offshore-platform, multiple-well-group workover tasks. Compared with mobile workover operation platform, construction, installation and maintenance costs of the mobile workover module are reduced greatly, realizing the operation synergy, developing new patterns and new ideas suitable for the marginal oilfield workover.
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    Engineering Optimization for Reducing the Effect of Smoke Diffusion on Marine Helideck
    CHEN Xin, LI Dong-fang
    2018, 5 (6):  380-383.  DOI: 10.12087/oeet.2095-7297.2018.06.04
    Abstract ( 311 )   PDF (6367KB) ( 154 )  
    In order to reduce the effect of smoke diffusion on the helideck, researches are conducted for the Liwan 3-1 project. It is revealed that engineering optimizations can be made by means of increasing either the horizontal spacing or relative height difference between the exhaust pipe and the helideck, and the latter approach is more efficient.
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     Subsea Flexible Pipeline Installation Protection  Technology and Application
    CHEN Wei, LIANG Xu, CHEN Da-jiang, SONG Ping-na, WANG Ling-yu
    2018, 5 (6):  384-389.  DOI: 10.12087/oeet.2095-7297.2018.06.05
    Abstract ( 415 )   PDF (35814KB) ( 89 )  
    Subsea flexible pipe is widely used in offshore oil and gas development. It has good overall economic effect and it is necessary to study how to protect the pipe during transportation and construction. The unexpected failure of pipe caused by bending, scratching, torsion or excessive extrusion should be avoided. Considering the potential risks, feasible technical solutions are proposed and applied in offshore projects, and anticipative results are achieved. These methods can be reused for similar projects in the future.
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    Reliability Calculation Analysis and Risk Assessment of  Submarine Pipelines Under Corrosion Defects
    WANG Wei, CHEN Guo-min, CHEN Qi, LU Yu, ZHANG Zong-chao
    2018, 5 (6):  390-395.  DOI: 10.12087/oeet.2095-7297.2018.06.06
    Abstract ( 311 )   PDF (2083KB) ( 138 )  
    In order to calculate the reliability of submarine pipelines under corrosion defects, the risk score and risk grade of submarine pipelines are evaluated and analyzed. Based on the failure probability model of DNV corrosion factors, the reliability of submarine pipelines is evaluated, and the reliability index and failure probability under different corrosion depths are calculated, and the safety grade is evaluated. According to the DNV-OS-F101-2007 specification, the risk factors and risk score of submarine pipelines are identified. The risk assessment process of submarine pipelines is given, and the risk score and risk grade of pipelines are determined. It can provide reference for risk assessment of high pressure gas pipeline transmission by submarine corrosion pipelines.
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    Design and Application of Channel  Type Multi-Functional Tube Box
    MA Chao, YU Bo-han, GUO Jia-ning, CUI Hong-ran
    2018, 5 (6):  396-399.  DOI: 10.12087/oeet.2095-7297.2018.06.07
    Abstract ( 243 )   PDF (2621KB) ( 80 )  
    On conventional offshore platform module drilling rig the mud return pipe occupies part of the secure channel, which does not meet the safety rules of the offshore fixed platform because of its 16-inch outer diameter. We creatively provide a technical solution of replacing the 16inch pipe with a channel type multi-functional tube box. The design principle and functional effects are introduced in detail.
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    Damage Assessment of In-Service  Subsea Pipeline
    SUN Guo-min, ZHANG Jie, Xü Zhi-hui
    2018, 5 (6):  400-404.  DOI: 10.12087/oeet.2095-7297.2018.06.08
    Abstract ( 343 )   PDF (1620KB) ( 66 )  
     Different types of damage of the risers and subsea pipelines are summarized. The cause of the damage to the subsea pipe is summed up. The assessment methods and codes to check the different damage types are enumerated. The evaluation of surface defects is mainly to evaluate whether the surface defect degree of damaged subsea pipe meets the specification requirements. The evaluation of mechanical strength can tell us whether the local stress is exceeding the requirements of the code; the finite element method is used to simulate the overall pipeline stress, so as to judge whether the overall pipeline strength meets the specification requirements. Through the above evaluation methods, we can judge whether the subsea pipe can continue to operate after damage. It effectively solves the problem of in-service pipeline damaged structure evaluation, providing a reference for the project decision.
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    Drill Pipe Processing Interface Auto-detective System  of Iron Roughneck
    WANG Ke-zhu, ZHU Dai-xing
    2018, 5 (6):  405-409.  DOI: 10.12087/oeet.2095-7297.2018.06.09
    Abstract ( 283 )   PDF (12742KB) ( 44 )  
    With regard to the situation that the existing iron roughneck requires manual assistance when detecting the center and processing interface of drill pipes to fulfill the drill pipe processing operation, we develop the drill pipe processing interface auto-detective system. This system consists of a linear displacement sensor, 300 PLC controller and a linkage mechanism which can reset automatically. This system not only achieves the full-automatic detection of the drill pipe center, also detects the interface of drill pipes automatically. This eliminates the manual operation step during the drill pipe operation and improves the automation level of iron roughneck.
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     Study on the Operation Capability of an Ultra-Deep Water Drillship
    YANG Xu, HE Yu-fa, LI Bo, ZHAO Jing-rui, ZHANG Li-jun
    2018, 5 (6):  410-416.  DOI: 10.12087/oeet.2095-7297.2018.06.10
    Abstract ( 231 )   PDF (2950KB) ( 113 )  
    Hydrodynamic analysis of a seventh generation ultra-deep water drillship is carried out to solve added mass and response amplitude operator. Short term response prediction is made for the South China Sea, west Africa and Brazil offshore oilfield environment conditions. The operation capabilities of drilling, well testing, running BOP and riser disconnect operations in different wave direcions are studied and weighted operation capabilities in different areas are presented. Besides, the available period/wave height combinations are analyzed. The results can provide reference to the design and operation of drillship.
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     Central Control System Communication Between Different Platforms Based on OPC Technology for Offshore Oil and Gas Field
    LI Mo-lin
    2018, 5 (6):  417-420.  DOI: 10.12087/oeet.2095-7297.2018.06.11
    Abstract ( 268 )   PDF (9334KB) ( 70 )  
    With the gradual improvement of automatic production in offshore oil and gas fields, cross-platform joint control is becoming more and more common. Choosing a safe, reliable and cost-effective data communication mode has become a key factor in the implementation process. The technical characteristics of OPC communication are analyzed through an example of OPC communication between a newly built platform and an old platform in a certain oilfield group of the South China Sea. The system configuration and software application methods of OPC communication are mainly expounded, so as to provide some reference for similar projects.
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    Analysis of the Influence of Different Material Hardness on the  Performance of Combined Seal Structure in DeepSea Environment
    YI Pan, JIN Yong-ping, PENG You-duo, WAN Bu-yan
    2018, 5 (6):  421-428.  DOI: 10.12087/oeet.2095-7297.2018.06.12
    Abstract ( 282 )   PDF (24093KB) ( 57 )  
    In order to meet the need of safe and stable operation of deep-sea equipment under the special working conditions of deep-sea high pressure, with the combined seal structure under deep-sea high-pressure environment as the object, the axial symmetry finite element model of the combined seal structure is established by the ABAQUS finite element analysis software, and the influence of the material hardness of different O-ring seals on the performance of the combined seal structure is analyzed. The results show that the maximum Von Mises stress of the O-ring decreases with the increase of the material hardness, but the maximum contact pressure of each sealing lip of the seal ring and the slip ring gradually increases as the material hardness increases. When the O-ring material has a low hardness, the O-ring will be squeezed into the gap between the slip ring and the groove, causing a “sharp angle” phenomenon, which in turn causes the seal structure to fail. The research results provide theoretical basis and technical support for the optimization of combined seal structural materials and the optimal design of seal structures in deep-sea high-pressure environment.
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