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Table of Content

    25 June 2014, Volume 1 Issue 2 Previous Issue    Next Issue
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    Orginal Article
    Technical Features Analysis for Deepwater Ocean Engineering Equipment Used in the South China Sea
    Guo-ping ZHOU
    2014, 1 (2):  95-102. 
    Abstract ( 343 )   HTML ( 4 )   PDF (5259KB) ( 210 )  

    Development of deepwater oil and gas resources of the South China Sea is not only an urgent need for energy security, but also the necessary measure to protect the rights and dignity of China in the South China Sea as a sovereign state. For the development of ocean economy and the construction of ocean power, ocean equipment must be considered first. Ocean engineering equipment is the main body of ocean development equipment, which is among the four categories of ocean equipment. Deepwater area of the South China Sea is broad, and the ocean is very rich in oil and gas resources. However, the geographical environment in the South China Sea is very complex, and the deepwater area is far away from the mainland. According to the geographical environment features of the deepwater area of the South China Sea in China, the main technical features of adaptive deepwater ocean engineering equipment are analyzed, and several suitable operation modes for the deepwater ocean oil and gas resources development are introduced. This research may provide certain reference for the deepwater oil and gas resources development in the South China Sea.

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    Developing Offshore Marginal Oil Field with Movable Platform
    Bing YE
    2014, 1 (2):  103-105. 
    Abstract ( 268 )   HTML ( 0 )   PDF (794KB) ( 127 )  

    Marginal oil fields have the features of small reserves, poor economic performance, high cost, and difficult development. However, most of the offshore oil fields found in recent years are marginal oil fields. It is necessary to develop reusable facilities with small investment for such oil fields. Movable platforms have simple structure and light weight, and can realize installation without the need of large-scale installation vessels, thus leading to an investment saving. Besides, they can be moved to other similar oil fields for reuse. The main types, scope of applications and installation methods of movable platforms are introduced. The structure and scheme of a real application example in the development of marginal oil fields are described in detail.

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    Key Technologies of Relief Wells in Deepwater Drilling
    Zheng TIAN, Jian-liang ZHOU, Hai-xiong TANG, Shi-quan JIANG, Xi-ning HAO
    2014, 1 (2):  106-110. 
    Abstract ( 298 )   HTML ( 0 )   PDF (1442KB) ( 165 )  

    Deepwater relief wells exhibit characteristics of high risk, high technology, high investment and high social sensitivity. When the well is out of control and the routine rescue measures fail, relief well is regarded as the ultimate rescue means. However, in China, the quantity of relief wells is relatively small, and the deepwater relief well experience is almost blank at present. Based on the research of relief wells at home and abroad, a series of key technologies of deepwater relief well are sorted and analyzed. Several key technologies such as location selection, the trajectory of relief well connected, well control and well abandonment are analyzed. The results provide certain reference for subsequent relief well study.

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    Analysis on Critical Points of Completion Design of Thermal Recovery Well
    Lei-xiang SHENG, Liang-bin XU, Shi-quan JIANG, Xun-ke LI, Yan-feng CAO
    2014, 1 (2):  111-115. 
    Abstract ( 227 )   HTML ( 1 )   PDF (2589KB) ( 168 )  

    Completion design for thermal recovery heavy oil well is different from that for normal well. According to experiences on development of heavy oil well in Bohai Bay, key technical poitns of completion design for thermal recovery heavy oil well are summarized, and analysis models of wellbore temperature profiles and working string thermal load are established. Effects of thermal injection and thermal extension of working string are evaluated, including sensitivity analysis on injection temperature and insulation measures. The results of an example shows that insulation measures can considerably lower the thermal loss along the path and the demand of reserved space in wellhead, especially at high injection temperature.

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    Application of Fuel Gas Screw Compressor on Offshore Platform
    Dao-qing SUN, Da-yong BIAN, Pan HU, Meng YANG, Zheng-ming CUI, Sheng-yu SHAO
    2014, 1 (2):  116-118. 
    Abstract ( 173 )   HTML ( 0 )   PDF (985KB) ( 138 )  

    Associated gas will be recycled during the processing of oil and gas on the offshore platform. The reciprocating compressor may be used for compression commonly. However, the screw compressor has more advantages compared with the reciprocating compressor. We describe the application of screw compressor based on a project on an offshore platform. The floorage of the screw compressor unit is about 43.8% of that of a reciprocating compressor unit, and the weight of the screw compressor unit is about 40.2% of that of a reciprocating compressor unit.

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    Engineering Application of Cutting and Retrieving for Riserless Deepwater Subsea Wellhead System
    Wu-nian ZHANG, Yin-ge JIA, Jing ZHANG, Jian LIU, Bo LUAN
    2014, 1 (2):  119-128. 
    Abstract ( 176 )   HTML ( 0 )   PDF (7121KB) ( 63 )  

    Cutting and retrieving of deepwater subsea wellhead system are an operation with no riser in deepwater drilling engineering. We introduce the researches, test, and improvement process of all the key equipments of our self-developed outside stretch latch rotary (OSLR) tool. According to the operational statistics of 10 wells and by comparison with foreign technology, it is proved that both of the self-developed deepwater mechanical cutting equipments and the dynamic cutting equipments have reached the level of engineering application. The importance of a rational selection of pump rate and the nozzle of the cutter is also discussed by analysis of force on the blade and the hydraulic design of engineering systems.

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    Fracture Assessment and Fatigue Assessment of Jacket Tubular Joints
    Yan-kun YIN
    2014, 1 (2):  129-135. 
    Abstract ( 239 )   HTML ( 0 )   PDF (3019KB) ( 157 )  

    The design and assessment of jacket tubular joints are usually performed based on the stress-lifetime (S-N) curve in Chinese ocean oil and gas engineering projects, while the fracture mechanics methods are rarely employed. This article describes the basic theory of fracture mechanics, ECA, fatigue crack growth law and general assessment procedure, and then gives an assessment example by JPEFA program.

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    Application of He-N2 Leakage Detection to High Pressure Oiland Gas Pipeline
    Lei LI, Xing-peng XIAO
    2014, 1 (2):  136-139. 
    Abstract ( 217 )   HTML ( 1 )   PDF (1187KB) ( 156 )  

    For safe production with no leakage on the offshore oil platform, the leakage test must be done after the hydrostatic test according to the correlative standard of the high pressure or flammable fluid system. The He-N2 test can measure the leaking amount accurately with helium leakage detector. This method has potential applications in the leakage detection of high pressure oil and gas pipelines.

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    Time-Domain Simulation of OSV Operation
    Jin-long MEN, Jin-song XU, Hao SHI, Zuo-xin HOU
    2014, 1 (2):  140-145. 
    Abstract ( 221 )   HTML ( 0 )   PDF (5896KB) ( 142 )  

    A simulation approach for offshore support vessel (OSV) operation is established in the Matlab/Simulink environment. The time-domain numerical results were concurrently transferred into the visualization package to accomplish the virtual operation and control. The typical gangway deployment of the case vessel "Runjiang 1" in station keeping condition was successfully simulated on this virtual platform. The complete time-domain results are valuable for safety assessment and procedure optimization.

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    Test Technology of Subsea Production System
    Bin CHEN, Feng SU, Kai ZHOU, Dong-dong LIU, Hua-jian LIU
    2014, 1 (2):  146-150. 
    Abstract ( 167 )   HTML ( 0 )   PDF (1201KB) ( 195 )  

    Test technology is an important branch of the subsea production system engineering in the future deepwater oil and gas exploitation. What and how to do in the development of deepwater oil and gas field are discussed. Based on studying the application of foreign manufacturers and the domestic oil and gas development, we suggest that the integrity test of the subsea production system is the main direction in the future. Meanwhile, we focus on the scope of work of system integrity test and qualification test for new products.

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    Principle and Mounting Technique of Heavy Crane Electric Slip Rings
    Lian-feng YANG
    2014, 1 (2):  151-155. 
    Abstract ( 223 )   HTML ( 0 )   PDF (2422KB) ( 138 )  

    The principle, structural features and characteristics of the electric slip rings at the joint part of crane and ship body of a deepwater pipe-laying crane ship under construction are introduced. The mounting technique of the electric slip rings used on the crane is described in detail. The results can fix the problem that the existing equipment manuals are lack of guidance, and will direct the following maintenance of the slip rings. It will provide a reference for the installation of electric slip rings for similar marine heavy rotary equipment.

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    Jacking Control of Self-Elevating Wind Turbine Installation Unit
    Mu-dan CHEN
    2014, 1 (2):  156-159. 
    Abstract ( 211 )   HTML ( 0 )   PDF (989KB) ( 158 )  

    The general situation of hydraulic ring beam and pin type jacking installation of "Lanchao 1001" is introduced. The basic work principle, arrangement of control system, setting of control position, control mode and hydraulic power control of jacking control system are described. "Lanchao 1001" has come into service. Through the practice, it is proved that the control system has the advantages of high reliability and safety, simple structure, and convenient operation, satisfying the jacking requirements of the wind turbine installation unit.

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    Reviews of the Cargo Containment Systems of Large Scale LNG Carriers and the Welding of Related Low Temperature Metals
    Wen-hu LIN, Xue-ming HUA, Yi-xiong WU, Yong-sheng TANG, Hui-ping ZHANG
    2014, 1 (2):  160-165. 
    Abstract ( 216 )   HTML ( 0 )   PDF (2696KB) ( 157 )  

    Materials selection of liquefied natural gas (LNG) cargo containment systems has influence on the design of structure, safety and cost. As cryogenic temperature metals make up the most in LNG carriers, they are closely related to the design and manufacture. Considering the bearing part and insulation part of containment system, four different metals including invar alloy, 304L stainless steel, Ni9 steel and A5083 aluminum alloy can be taken into account. Thermal conductivity influences the insulation layer's design and welding metallurgy, while low mechanical strength improves the thickness of plate that influences the processing, moving, installation and cost. Material parameters and welding techniques of them are summarized.

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    Weldability of Low-Temperature Steel Used in LNG Pipeline Projects
    Feng-tai DU
    2014, 1 (2):  166-173. 
    Abstract ( 164 )   HTML ( 0 )   PDF (860KB) ( 126 )  

    A brief description of various low-temperature steel used in liquefied natural gas (LNG) pipeline projects and its welding processes is given. For domestic Ni9 steel under different welding heat inputs, the influence of the secondary welding thermal cycle on Ni9 steel heat affected zone is discussed, as well as the structure characteristics and embrittlement tendency during the welding process. The research results show that single-pass welding is not suitable for Ni9 steel. However, in multi-pass welding process, the tempering effect of the subsequent welding can improve the low-temperature toughness well; recrystallization of the coarse grain structures is a key factor to improve the low-temperature toughness of Ni9 steel.

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    Welding Quality Control for Offshore Oil Platform Steel Structure
    Huan-huan ZHANG
    2014, 1 (2):  174-176. 
    Abstract ( 207 )   HTML ( 0 )   PDF (1985KB) ( 169 )  

    The operations including fit-up inspection, welding process monitoring and visual inspection during offshore oil platform steel structure welding are described. The reason of defects when some welding parameters get out of control are analyzed. Several aspects that we should pay attention to are emphasized. A method of welding quality control for oil platform steel structure is obtained, which can provide a reference for the quality assurance of offshore oil platform steel structure fabrication.

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    Application of Bulkhead and Water Stop in Marine Pipeline Design
    Xu LI, Qing LI, Hu YANG, Xian-hong FENG, Xuan YU
    2014, 1 (2):  177-179. 
    Abstract ( 206 )   HTML ( 0 )   PDF (907KB) ( 111 )  

    The pipe-in-pipe (PIP) insulation pipeline configuration has been widely used in crude oil transportation. We analyze the selection principles of bulkhead and water stop in PIP insulation pipeline design. The structure configuration, installation method, mechanical property and economy are compared between the bulkhead and water stop. Their advantages and disadvantages are given. The selection principles for number and configuration of the bulkheads and water stops are described. Finally, the conclusion is verified in the LF13-2 pipeline replacement project.

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    Diesel Energy-Saving Model Design of Offshore Platform
    Qin LÜ, De-tang LI, Da-te LI, Wen-tao TANG, Wei-nan CAO
    2014, 1 (2):  180-183. 
    Abstract ( 295 )   HTML ( 1 )   PDF (924KB) ( 141 )  

    In order to resolve the problem of serious energy waste of marine diesel engine platform and achieve energy conservation and emission reduction, we develop the jacket water waste heat utilization energy-saving technology for diesel engine cylinder liner and a new type of marine diesel exhaust heat insulation technology of fresh water. By these new technologies, we can maximize the utilization rate of diesel engine waste heat of offshore platform and reduce emission, achieving energy saving and environment protection. In the 21st century, the age of ocean, energy has become an important issue in the development of economy, so the proposed energy-saving technologies for the development of offshore platform are significant.

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    General Situation of Global Liquefied Natural Gas Production and Trade in Recent Years
    You-ming SU, Shuai CHEN, Hui ZHANG, Guo-sheng GUO, Yan-hua LI
    2014, 1 (2):  184-188. 
    Abstract ( 145 )   HTML ( 0 )   PDF (595KB) ( 116 )  

    Currently, the pollution of fog and haze is becoming increasingly serious. As a clean and efficient energy, the proportion of natural gas in the energy structure improves continuously. This paper describes the natural gas and liquefied natural gas (LNG) resources in the current world. The current trade situation and main consumer markets of LNG are analyzed. It also shows the main trade way and characteristics of LNG and provides basic information and basis for exploitation and sustainable development of liquefied natural gas in the new century.

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