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    25 August 2017, Volume 4 Issue 4 Previous Issue    Next Issue
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     Study on the Joint Distribution of Wave Heights and Periods in the South China Sea Based on Observed Data
    HUANG Bi-gui, JIN Jia-meng, HU Qin, XIE Bo-tao
    2017, 4 (4):  187-192. 
    Abstract ( 315 )   PDF (7575KB) ( 68 )  
    The joint distribution of wave heights and periods is an important design basis of ocean engineering design, especially for floating structure design. Many theoretical models and empirical formulae for joint distribution of wave heights and periods have been proposed. In this paper, 1 year measured wave heights and periods data in north of the South China Sea are applied to examine the joint distribution models of wave heights and periods. The results show that the theoretical models of Longuet-Higgins, C.N.E.X.O., Sun and Zheng are not suitable to the South China Sea, while the empirical model of Bitner-Gregersen is suitable to this area. Additionally, the parameters of the BitnerGregersen formula are calibrated, and the contour of wave height and period is plotted. The results can be applied to the ocean engineering design in the South China Sea.
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     Application of Quantified Risk Assessment Technology in the Development of Deepwater Gas Field in the South China Sea
    HU Zhong-qian, LV Song-song, LI Zhong-tao, WANG Hong-hong
    2017, 4 (4):  193-198. 
    Abstract ( 258 )   PDF (3901KB) ( 67 )  
    Quantified risk analysis (QRA), fire and explosion analysis (FEA) and exhaust gas dispersion analysis are gradually widespreadly used to identify and evaluate the leakage, dispersion, fire and explosion risk of oil and gas and fatality risk of personnel on offshore facilities. Based on these studies, the safety engineer and owner can make decision and determine appropriate safety critical elements (SCE) required for the hazard. We review the successful application experience of QRA, FEA and exhaust gas dispersion analysis in the basic design phase of offshore gas field development project. For platform A in the South China Sea, the application objective and status, the effect achieved, and the existing problems are described. Especially, feasible safety solutions such as passive fire protection material and blast wall are introduced. This research can provide reference for other similar projects.
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     Pigging Solutions Study of Subsea Tieback Flowline for Deepwater Oil and Gas Fields in the South China Sea
    YU Xi-chong, WANG Chun-sheng, LI Bo, CHENG Bing, LI Yan, WANG Qing
    2017, 4 (4):  199-204. 
    Abstract ( 368 )   PDF (5245KB) ( 77 )  
    Based on fully investigation and research of pigging solutions of subsea tieback flowline for the domestic and foreign deepwater oil and gas field development projects, according to the specific characteristics of deepwater oil and gas development project in the South China Sea, the comparative analysis for different pigging solutions of subsea tieback flowline is carried out, and pigging solutions adoptable for the South China Sea projects are obtained. Different pigging solutions have different advantages, disadvantages and application ranges. The scheme of launching and receiving pig on the existing facility is widely used for projects with high pigging frequency, while the subsea launching pigging solution is used for projects with low pigging frequency. OLGA software is used to simulate the pigging operation of a certain deepwater gas field in the South China Sea, and multiphase transient flow characteristics during pigging are analyzed. The results can be used to conduct flow assurance design and pigging operation in subsea tieback flowline to existing facility.
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     Technology Progress of Subsea Multiphase Boosting
    LIU Yong-fei, LI Qing-ping, QIN Rui
    2017, 4 (4):  205-210. 
    Abstract ( 280 )   PDF (4315KB) ( 189 )  
    We mainly summarize the technical principle and parameters of helico-axial multiphase boosting technology, twin screw multiphase boosting technology, contra-rotating multiphase boosting technology, etc., and analyze the characteristics and application status of them. Meanwhile, the difficulties of subsea multiphase boosting technology at present, including the adaptability of liquid fluctuation conditions, the restriction of long distance power supply technology, subsea installation challenges, reliability of new technology, and reliability of the integrated equipment, are analyzed. This work will provide reference and technical supports for the application of the subsea multiphase boosting technology in subsea oil and gas field development.
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     Layout and Lifting Design of Compressors for a Deepwater Gas Field in the South China Sea
    WU Yao-zeng, QIN Xiao-gang, WANG Wen-xiang, HONG Yi
    2017, 4 (4):  211-216. 
    Abstract ( 272 )   PDF (4199KB) ( 68 )  
    Optimizing the configuration of the compressors, controlling the weight of the platform and reducing the investment cost are the key to the success of the deepwater natural gas development project. Since the number and operating conditions of compressors of the deepwater gas field in the South China Sea are complex, the deck area and the lifting design of the offshore platform are directly influenced by the selection and layout of the compressors. Under the precondition of compliance with the stringent weight limitation of “FLOAT-OVER” used for the offshore platform installation, we recommend the optimization scheme with less number of compressors and low investment, and propose to use platform crane to hoist large reservation compressors, which saves a lot of investment for the project.
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     Research on Piping Weight Control of a Gas Field in the South China Sea
    LI Hu, HUANG Dong-yun, BA Yan, XIE Jin-qiu
    2017, 4 (4):  217-220. 
    Abstract ( 183 )   PDF (3043KB) ( 60 )  
    We review the mechanism of CO2 corrosion in gas field exploitation of a platform in the South China Sea. The relevant protection methods are also introduced. The importance of weight control is emphasized to this platform. The selection of pipe material is considered to reduce piping weight so that the overall weight of the platform is controlled within the required weight limits.
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     Design and Installation of Subsea Foundation and Protection Frame
    WU Fei, CI Hong-sheng, JIA Xu, HUANG Jun
    2017, 4 (4):  221-226. 
    Abstract ( 291 )   PDF (6768KB) ( 118 )  
    With the increase in water depth of oilfield development, subsea production system has been applied widely. Subsea foundation structure and protection frame play an important role in subsea production system and vary depending on the working conditions, etc. We aim to find the best design and installation method with comparisons and choose the scheme based on the specific project of western South China Sea.
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    Research and Application of New Sand Control Filling Tool for Offshore Horizontal Well
    WAN Xiang, HE Peng-fei, LI Jun-bao, WANG Yun-hai, BIAN Jie, YUAN Ze-ming, DONG Xiao-lin
    2017, 4 (4):  227-231. 
    Abstract ( 248 )   PDF (5444KB) ( 60 )  
    Sand filling control in horizontal wells is widely used in oil and gas development, but if mudstone exists, the possibility of sand filling failure will increase. In order to solve the failure of filling sand control when drilling a large section of mudstone in horizontal wells in offshore oilfields, through the research and analysis on existing technology, we compare and optimize the feasible treatment programs, and develop and apply a new filling tool. In the new tool design, the back plug, the positioning seal and the bottom bypass assembly form the bottom flow passage of the tool; the 177.8 mm blind tube, the 127 mm blind tube, and the corresponding bottom end are inserted into the sealed annulus to form the middle liquid flow passage; the upper bypass quick connection assembly is connected to the two layers of blind tubes and provides a liquid flow passage at the top. After the completion of the new tool, the reliability and functionality of the method are verified by means of weak point strength theory calculation and actual test. Finally, a field application is carried out in a well in QHD Oilfield. The results show that the new type of open hole fracturing completion tool is superior in performance and safe and stable.
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    Directional Coring Technology and Practice of Un-Cemented and Unconsolidated Formation in High Inclination Well
    LUO Qing-shi, PEI Jin-zhao, CHEN Guo-jun, YANG Zhi
    2017, 4 (4):  232-235. 
    Abstract ( 169 )   PDF (5560KB) ( 56 )  
    Hanjiang reservoir formation is shallowly buried with un-cemented and unconsolidated oil sands in oilfield located at the east of the South China Sea. The coring recovery in this formation is only 30%~50% with conventional tools due to the serious washout during operation. Loss of centering and stability, together with high torque of the drill pipe in high inclination directional well will exacerbate the coring difficulties. We analyze the factors affecting the coring recovery in un-cemented and unconsolidated oil sands. Through selecting the coring tools, optimizing the drilling tools combination, starting from the mudstone caprock above oil sand, adjusting the drilling parameters and improving technical measures, coring operation is achieved with high recovery of 78.7% which exceeds the coring recovery of 50% stipulated in industry standard of China.
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    Wall Thickness Calculation Method for Top Tensioned Riser
    WANG Yu-han, XU Ai-jin, CHENG Yong-ming, SHENG Xing
    2017, 4 (4):  236-239. 
    Abstract ( 283 )   PDF (2572KB) ( 74 )  
    Based on the code requirement and stress criterion, the wall thickness selection method of top tensioned riser (TTR) is introduced, including analysis procedure, analysis method and checking standard. Then wall thickness calculation method is further verified through an actual engineering example. This research can provide an important reference for the deepwater TTR riser design.
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    Research on Module Settlement and Adjustment of LNG Steel Project
    LIU Rong-kun, LI Jia-jun, TIAN Cong-yong, WANG Yi, LENG Ya-lin, YANG Jian-chang
    2017, 4 (4):  240-244. 
    Abstract ( 217 )   PDF (5608KB) ( 75 )  
    Settlement will happen in the field-assembly period on liquefied natural gas (LNG) steel modules as they are very heavy. The settlement will influence the installation accuracy of equipment and pipelines. Based on the periodic monitoring on the settlement of the modules which are fabricated on different foundations, the final settlement amount and the feature are found from numerical analysis. In consideration of their different performance, proposals are provided to deal with the settlement to ensure the elevation accuracy of pipelines and instruments installed on them.
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    Analysis and Engineering Application of Hydraulic Pile Hammer System
    LIU Hao, WANG Hao-yu, HUANG Shan-tian, YUAN Qing-dong, WEI Jia-guang, LI Huai-liang
    2017, 4 (4):  245-248. 
    Abstract ( 181 )   PDF (3544KB) ( 92 )  
    Hydraulic hammer is an efficient, energy saving and environmental protection pile penetration construction machine. With the continuous development of China's modernization, the application range of hydraulic hammer is more and more extensive. We analyze the development of hydraulic pile hammer, and expound its working principle. The working principle, oil circuit and hydraulic system of hydraulic hammer are systematically analyzed and studied. The composition and working principle of typical hydraulic hammer which is applied widely in engineering are analyzed. Through learning and absorbing foreign advanced technology, the research can provide technical reserves for the development of domestic hydraulic hammer.
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