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25 February 2015, Volume 2 Issue 1 Previous Issue    Next Issue

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Development of 20 m Seafloor Core Sampling Drill Bu-yan WAN, Yong-ping JIN, Xiao-jun HUANG 2015, 2 (1):  1-5.  Abstract ( 254 )   HTML ( 0 )   PDF (2436KB) ( 483 )   Seafloor core sampling drill is necessary equipment for marine geologic and environmental investigation. A 20 m seafloor core sampling drill is chosen as the study object. Its technical features and at-sea operation are described from the aspects of supporting and leveling mechanism technology, drill string making and breaking, drill rods storage technology, telemetry/telecontrol and high-speed data communication technology, as well as escape technology. Figures and Tables | References | Related Articles | Metrics

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Study on Global Strength of the New Floating Drilling, Production, Storage and Offloading Structure Jing ZHAO, Lei LIU, Fu-hong JIANG, Zhi-gang YANG, Bin XIE, Shi-sheng WANG, Xi-chong YU, Jing-rui ZHAO 2015, 2 (1):  6-6.  Abstract ( 231 )   HTML ( 0 )   PDF (3395KB) ( 316 )   Nowadays, the deep water in China is in the early developing stage, and it adapts for floating drilling, production, storage and offloading structure (FDPSO), which integrates the functions of drilling, production and storage. FDPSO can reduce much expense for early development of oil field. In this paper, a new-style eight-square FDPSO is studied. Based on the complex environment in deep water and the load cases, the global structure model is built. According to the three-dimensional potential flow theory and spectra-based analysis method, the wave loads are calculated and design wave parameters are decided. By transferring the design wave loads to global structure model, the structure stress is obtained. The calculation results can provide theoretical reference for the design of FDPSO working in the oil fields of deep water. Figures and Tables | References | Related Articles | Metrics

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Several Well Completion Technologies for Deepwater Gas Field Zheng TIAN, Ji-hua YE, Zheng-li LIU, Jun-feng LUO, Chun-jie ZHANG, Hao JIN 2015, 2 (1):  12-17.  Abstract ( 240 )   HTML ( 0 )   PDF (1695KB) ( 312 )   With the development of offshore oil exploitation into the deepwater region, we encounter a series of difficulties and challenges in practice in the South China Sea during deepwater operation. The severe natural environment puts forward higher technology standards and requirements on deepwater well completion. In the aspects of well completion tools, equipment, construction technology and strategy, there exists obvious difference between deepwater tasks and shallow water or land operations. According to the characteristics of deepwater operation, some difficulties and key technologies are analyzed. The completion sand control, perforating technology, and fracturing filling technology are studied separately. In the deepwater well completion practice in South China Sea, the possible risk points and technical solutions are summarized. The results can provide reference for the subsequent design and operation. Figures and Tables | References | Related Articles | Metrics

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Comparative Experimental Study on Severe Slugging Characteristics in Different Riser Shapes Jing YE, Lie-jin GUO, Sen-lin CHEN, Qing-ping LI, Nai-liang LI 2015, 2 (1):  18-22.  Abstract ( 408 )   HTML ( 0 )   PDF (2016KB) ( 367 )   The characteristics of severe slugging flow in two types of riser systems are studied, including occurrence region, pressure fluctuations at riser base, cycle time, and liquid slug length. The flow pattern map in S-shaped flexible riser is compared with the classical severe slugging flow transition criteria. The experimental results show that the severe slugging cycles are similar in two types of risers. However, there is a second growth on the pressure fluctuations in the S-shaped riser compared with the vertical riser. The period duration in the S-shaped riser is longer, but the liquid slug length is shorter. The occurrence region of severe slugging flow in the S-shaped riser is smaller than that in the vertical riser. Figures and Tables | References | Related Articles | Metrics

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Numerical Analysis of the Effect of Artificial Diffusion Terms on Two-Fluid Model Peng-fei HAN, Lie-jin GUO, Qing-ping LI, Hai-yuan YAO, Bing CHENG 2015, 2 (1):  23-27.  Abstract ( 196 )   HTML ( 0 )   PDF (1452KB) ( 338 )   When artificial diffusion terms are introduced in two-fluid model, the effects of different artificial diffusion coefficients are studied. For vertical pipe Water Faucet problem, when the artificial diffusion coefficients are gradually increased, nonphysical oscillations can be eliminated. For horizontal pipe flow in ill-posed region, the calculated results without diffusion terms agree with experimental data but the mesh independent solution cannot be obtained. When the coefficients calibrated in Water Faucet problem are adopted, hydrodynamic instability is suppressed to some extent and slug frequency is underestimated. Therefore, the amount of artificial diffusion varies with different flow conditions and should be determined specially. Figures and Tables | References | Related Articles | Metrics

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Thermal Expansion of Deep-Sea Pipeline with Inline Manifold Xiu-feng LI, Xian-hong FENG, Dang ZHAO 2015, 2 (1):  28-31.  Abstract ( 317 )   HTML ( 0 )   PDF (1152KB) ( 323 )   In wet development of deep water oil and gas, subsea pipeline is connected to subsea wells or manifold by jumpers at the middle or the ends. The temperature profile of pipeline with inline manifold is discontinuous, and like that of two pipelines connected together. Finite element analysis can accurately predict the expansion displacement, but the analysis is complex and time consuming. Based on an actual project, using analytical method, we develop an in-house work sheet to calculate the displacements of pipeline with inline manifold and discontinuous temperature profile. The calculation method has been verified by finite element analysis and reviewed by a third party. The method is applicable to engineering projects. Figures and Tables | References | Related Articles | Metrics

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Analysis of Influence Factors for Pigging Effectiveness of Bypass Pig in Natural Gas Liquid Pipelines Hai-yuan YAO, Qing-ping LI, Bing CHENG, Shao-kai CHEN, Yong-fei LIU 2015, 2 (1):  32-35.  Abstract ( 249 )   HTML ( 0 )   PDF (2370KB) ( 311 )   There exist many problems such as high pigging velocity and long pigging slug in the pigging process in natural gas liquid pipelines by using traditional pig. In order to solve these problems, bypass pigging technology has been developed. To analyze relevant factors in the design and application of bypass pig, a subsea pipeline pigging model is built by using OLGA software (version 7.2) and the factors including bypass ratio of the bypass pig, pipe diameter, gas liquid ratio, pig weight etc. have been analyzed, which can provide reference for the design and application of bypass pig. Figures and Tables | References | Related Articles | Metrics

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Stress Analysis of High Temperature Piping in Offshore Platform Hong-mei XU, Lei LI, Hua-wei HAN, Gong ZHANG, Tan-long ZHANG 2015, 2 (1):  36-39.  Abstract ( 235 )   HTML ( 2 )   PDF (1644KB) ( 468 )   The temperature of exhaust pipe in offshore platform is very high. This high temperature will cause thermal stress in piping system and large force to connecting machine and hull structure during piping thermal expansion and contraction. Selection of expansion joint, pipeline arrangement, as well as type and structure of the supports have direct effects on the safety of connecting machine and hull structure. Static analysis and modal analysis are carried out with CAESARⅡ piping stress analysis software. The flexible factors of bend and tee of large diameter pipe are included as references. According to the calculation results, the primary stress and secondary stress of high temperature piping system can meet the standards. Figures and Tables | References | Related Articles | Metrics

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Bonded Hose in CALM System Meng WANG, Jie ZHANG 2015, 2 (1):  40-44.  Abstract ( 343 )   HTML ( 1 )   PDF (1637KB) ( 358 )   Bonded hose is the important equipment for oil transportation in catenary anchor leg mooring (CALM) system. Bonded hose is made of elastomer with additional layer such as textile layer impregnated with rubber, steel wire, etc. to improve the axial tensile and bending strength of the hose. There is little research on the bonded hose for offshore oil and gas field in China so far. We present the research on two types of bonded hoses in CALM system: floating hose and marine hose. The investigations on structure and length selection and configuration of two types of hoses are carried out. A design approach for structure selection and configuration determination is proposed. Taking marine hose as an example, the static and dynamic analysis is presented. Figures and Tables | References | Related Articles | Metrics

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Application of Subsea Structure Scouring Incipient Assessment Based on FLUENT in Indonesia Subsea Pipeline Project Zi-peng ZHOU, Wen-jun ZHONG, Mei-zhen ZHOU, Guo-min SUN, Le-qin WANG, Chun-hong HU 2015, 2 (1):  45-49.  Abstract ( 373 )   HTML ( 0 )   PDF (1106KB) ( 570 )   Many subsea pipelines have been failed during their service period caused by scouring of pipeline support structure. When a submarine pipeline or submarine structure is laid on a sediment bed, and is subject to a current, the pressure difference between the upstream and the downstream of the pipeline or the structure may induce a scour underneath the pipe and submarine structure. According to this problem, the subsea pipeline support structure scouring assessment is studied to forecast the scouring occurrence. Firstly, the sediment incipient velocity is calculated based on scouring theoretical analysis, and then a two-dimensional geometry model is built in FLUENT software, and the actual seabed current velocity is obtained based on numerical simulation by FLUENT software. Through the comparison between these two velocities, the scouring occurrence could be assessed. This method is validated in Indonesia subsea pipeline project. Figures and Tables | References | Related Articles | Metrics

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Optimization Design of Tubing Hanger Outlet Angle of Horizontal Tree Rui QIN, Qing-ping LI, Xiao-lan LUO, Meng-lan DUAN 2015, 2 (1):  50-54.  Abstract ( 386 )   HTML ( 0 )   PDF (2666KB) ( 311 )   Aiming at the engineering problem of flow loss, an optimization design method of tubing hanger outlet is proposed on the basis of drag coefficient method, which considers the structural characteristics of tubing hanger, as well as the position and function of tubing hanger. By using the FLUENT software, a finite element model for tubing hanger is developed and the fluid flow in the tubing hanger is simulated. The results obtained by the drag coefficient method and the numerical results show that the best tubing hanger outlet angle is between 11° and 12°. Figures and Tables | References | Related Articles | Metrics

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Research on Assembly Process of All Slewing Floating Crane Yang BAI, Zhi-lin GAO, Zheng-quan XUE 2015, 2 (1):  55-59.  Abstract ( 270 )   HTML ( 0 )   PDF (1579KB) ( 414 )   Offshore oil development project relies on floating crane. On "HYSY201" deepwater pipe-laying crane vessel, the 4000 t all slewing floating crane is designed according to European standards. Its building and assembly are precision, difficult and complex, and the assembly quality directly affects the performance of the floating crane. The key technologies including assembly procedure, precision measurement, virtual assembly, tooling design, and lifting are introduced in detail. The general assembly process for such floating cranes are discussed. Figures and Tables | References | Related Articles | Metrics

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Technology and Application of Offshore Lifting for Large-Diameter and Ultra-Long Anchor Pile Yong-biao YE, Feng GAO, Xing ZHANG, Wen-zhi FU, Hai-bin YE 2015, 2 (1):  60-63.  Abstract ( 360 )   HTML ( 0 )   PDF (1955KB) ( 492 )   Offshore anchor pile is very common in offshore structures such as jacket platform, offshore wind turbine platform and single point mooring system, etc. The installation of anchor pile has significant effect on the cost and process for the whole engineering, in which the lifting is the most important procedure in the offshore operation because it has a great demand for the crane capacity of the vessel. When the anchor pile is too long for the crane to lift vertically, underwater horizontal upending is required in the operation. We elaborate the scheme of underwater horizontal upending for the large-diameter and ultra-long anchor pile offshore lifting and discuss the key technical difficult points. An engineering example of anchor pile installation of single point mooring system in South China Sea is given, through which the reliability of underwater horizontal upending scheme is introduced and validated. This program provides new ideas and approaches for large-diameter and ultra-long anchor pile offshore installation. Figures and Tables | References | Related Articles | Metrics

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Simulation Study on Power Line Carrier Communication Design for Subsea Production Control System Shu-bin WANG, Ying LIU, Hai-liang CAO, Long-chuan GUO, Jue WANG, Chun-li ZHU, Jia TIAN 2015, 2 (1):  64-71.  Abstract ( 417 )   HTML ( 2 )   PDF (2546KB) ( 311 )   The normal operation of subsea production control system is closely linked to the safety and reliability of communication system. Power line carrier communication (PLC) model is established with the concept of lumped parameter, and the RLGC measured data of an underwater gas field of the South China Sea is introduced into the system. The OrCAD Capture software is used for simulation. Attenuation curves of different transmission paths are obtained. Finally, through limiting the bit error rate, the attainable transmission rate is calculated. In this way, a new method is provided for the communication design of subsea production system. Figures and Tables | References | Related Articles | Metrics