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Overview of Subsea Well Intervention Technology and Equipment Development WANG Di, HUANG Congcong, CHANG Shuangli Ocean Engineering Equipment and Technology    2023, 10 (2): 126-130.   Abstract （97）      PDF（pc） （2963KB）（555）       Knowledge map    Save As the continuous expansion of the resources development of offshore oil and gas, more subsea well will be used at domestic offshore oil and gas fields, yet there is still no supporting technology and equipment for subsea well intervention in China. This paper compare the technology of well intervention and workover, introduce two kinds of light well intervention systems, compare their advantages and disadvantages, and then analyze the development and operation of subsea well intervention systems in the world. The development gap and countermeasures of related technologies in China will be summarized, at the end.  Related Articles | Metrics | Comments（0）

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Research on Key Technologies of Dynamic Analysis and Numerical Simulation for the Floating Offshore Wind Turbine QU Xiaoqi, LI Hongtao, TANG Guangyin, DU Haiyue, YANG Linlin Ocean Engineering Equipment and Technology    2023, 10 (2): 72-78.   Abstract （91）      PDF（pc） （8230KB）（546）       Knowledge map    Save With the development of floating offshore wind turbine technology, engineering projects of large scale floating offshore wind turbine has begun to emerge. Because manufacturers keep the parameters of wind turbine confidential, there are many challenges in numerical simulation analysis of floating offshore wind turbines in practical engineering projects. In this paper, the key technologies on numerical simulation of floating wind turbine in the practical engineering project was studied. Through the equivalent thrust model, a numerical model of real floating wind turbine was established and the dynamics responses under a typical load case was analyzed. Based on the research results of this study, the difficulties in establishing the numerical model of floating wind turbine in practical engineering projects can be well solved. This is of great significance to promote the technical development and accelerate the commercialization of China's floating wind turbine industry. Related Articles | Metrics | Comments（0）

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Key Technologies and Breakthrough Path of Hydrogen Production by Offshore Wind Power GAO Chang, LI Hongtao Ocean Engineering Equipment and Technology    2023, 10 (2): 89-94.   Abstract （156）      PDF（pc） （2904KB）（534）       Knowledge map    Save Marine renewable energy is abundant but difficult to store. The generation of green hydrogen from offshore renewable energy can provide a new idea for the storage of green energy. This paper mainly analyzes the key technologies of hydrogen production from offshore wind power, focusing on the four aspects of offshore water electrolysis hydrogen production technology, offshore hydrogen energy storage and transportation technology, offshore hydrogen production and storage equipment design, as well as offshore hydrogen production and storage scheme. This paper compares and summarizes the key technologies of offshore wind power hydrogen production in China, and puts forward relevant countermeasures and suggestions on this basis. It provides reference for the innovative development of offshore wind power hydrogen production technology and equipment in China. Related Articles | Metrics | Comments（0）

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A Brief Summary of Key Points for The Installation of Offshore Wind Turbine Monopile Foundation FAN Changhui Ocean Engineering Equipment and Technology    2023, 10 (2): 1-7.   Abstract （178）      PDF（pc） （6154KB）（534）       Knowledge map    Save The installation of offshore wind turbine monopile foundation requires a variety of ship machinery and lifting equipment, etc. If the suitabe selection of those above matters could make the completion of the construction objectives be achieved. In order to select suitable ship machinery lifting equipment, using project as example the compare between domestic and foreign monopile installation, the selection consideration of the main floating crane ship and the drivability of the hydraulic hammer are specifically analyzed through the verification analysis of the monopile stabilizing platform and the description of other additional installation points, which shows that the main considerations for the selection of marine machinery and lifting equipment for offshore wind turbine monopile installation in China and the verification analysis methods are useful. These can provide serve as for the selection of marine floating machine for monopile installation, for the design and verification of monopile stabilizing platform, and for the preparation of construction organization and scheme. Related Articles | Metrics | Comments（0）

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Study on Interface Principal for Topside of General FPSO LIU Yanming, HU Rong, GUO Guosheng, YE Yongkun, WU Zhikun Ocean Engineering Equipment and Technology    2023, 10 (2): 37-42.   Abstract （59）      PDF（pc） （5538KB）（517）       Knowledge map    Save Firstly, the purpose of study on interface principle for topside of FPSO is introduced; Secondly, the typical main process scheme, general arrangement, structure scheme are illustrated; Thirdly, the interface between FPSO topside and Hull/Subsea are analyzed and demonstrated, including the interface about process, general area, structure, EIT. Finally, it is prospected how to proceed the interface principal study in the future. Related Articles | Metrics | Comments（0）

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The Hull Structure Design and Practice of the Condensate Storage Tank of Semi-Submersible Platform LIU Xiaoyan, FENGJiaguo, LI Da Ocean Engineering Equipment and Technology    2023, 10 (2): 8-13.   Abstract （90）      PDF（pc） （5185KB）（457）       Knowledge map    Save There is little industrial experience and projects for semi-submersible platform with large volume condensate storage tanks. The hull structure design of condensate storage tanks were provided. Firstly, the column was designed with the double-wall voids (cofferdams ) around the condensate tanks and connected with flats with manholes for maintenance access. Secondly, the pressure head of condensate tank was increased by 10 m compared to the ballast tank after optimizing the reduction of 20 m. Thirdly, the bulkheads of condensate tank are non-watertight and continuous, but with the upper and lower 2 m height gaps for the flowing of condensate and gas. Fourth, the additional corrosion margin of 2 mm was added to the boundary of frequently ballast and de-ballast tanks in the nodes and columns. It is a successful practice for other similar design in the future. Related Articles | Metrics | Comments（0）

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Overview of the Development of Expendable Conductivity Temperature and Depth DU Libin, CUI Yongchao, LIU Jie, ZHANG Xiaobo Ocean Engineering Equipment and Technology    2023, 10 (3): 33-40.   Abstract （131）      PDF（pc） （1757KB）（334）       Knowledge map    Save Expendable Conductivity Temperature and Depth (XCTD) is an advanced marine dynamic environmental element measuring instrument, which can be used on various civil and military vessels, aircraft or submarines to quickly obtain underwater environmental information data. It is a standing instrument for marine survey and an important supplement to traditional measuring instruments such as marine environmental monitoring buoy, submarine buoy and shipborne CTD because of its flexibility, economy and simplicity. At present, the Expendable Conductivity Temperature and Depth is widely used in the field of ocean profile observation because of its characteristics of simple measurement, high measurement efficiency and low hardware cost. In order to understand the development gap at home and abroad and clarify the future development direction of this field, this paper expounds the development status of the expendable marine exploration instruments at home and abroad through comparative analysis and summary starting from its classification, at the same time, compares the main gap between domestic and foreign products, and focuses on the working principle and key technology of the Submarine-launched Expendable Conductivity Temperature and Depth (SSXCTD), meanwhile, the research summarized the future research directions in this field. Related Articles | Metrics | Comments（0）

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Design and Analysis of the Pressure Test Facilities of Subsea Wellhead and Supporting Tools GENG Yanan, WANG Mingchun, SUN Chong, ZHANG Huizeng, ZHAO Weiqing, ZHAO Suwen, LIJian, HU Xiaoyu Ocean Engineering Equipment and Technology    2023, 10 (2): 14-21.   Abstract （67）      PDF（pc） （5040KB）（324）       Knowledge map    Save Subsea wellheads subjected to complex internal pressure and external loads is the key equipment for deepwater oil and gas development. Currently, stability of subsea wellhead and corresponding supporting tools are mainly assessed by theoretical analysis and numerical simulation. Due to lack of pressure test tools, the actual structure responses of subsea wellhead and corresponding supporting tools could not be reflected. In this work, specialized tools aiming attesting the internal pressure of subsea wellhead and corresponding supporting tools are designed with consideration of different operation conditions and loads. Additionally, for guaranteeing the security of test tools during test experiments, mechanical strength analysis is carried out by establishing related finite element model. Simulation results show that bearing capacity test could be implemented in safety using the designed test tools, and the stress are lower than the yielding strength of test tools. The research could provide technical support for the structural design and optimization analysis of the subsea wellhead test tool. Related Articles | Metrics | Comments（0）

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Analysis and Practice on the Risk of Deep water Semi-Submersible Production Platform with Condensate Oil Storage LIU Xiaoyan, FENGJiaguo, LI Da Ocean Engineering Equipment and Technology    2023, 10 (2): 43-50.   Abstract （46）      PDF（pc） （2560KB）（293）       Knowledge map    Save Deepwater gas field development is characterized by large investment and high risk. However, there is little experience in deepwater gas field development in China. Combined HAZOP, HAZID, SIL and improved expert statistical analysis method, storage platform is established from two aspects of conventional risk and specific risk. On the basis of drawing lessons on the experience of foreign experts, the research focuses on the analysis of specific risks caused by such factors as fire and explosion, column storage of large-capacity condensate oil, construction based on domestic resources, first polyester cable, first large-diameter SCR, lack of deep-water experience, etc. The potential risks of the platform are fully identified in the aspects of project management, hull structure, riser, mooring system, hull system and platform. Commissioning, and the main risk countermeasures are given to effectively implement risk management. The research provides the guidance for engineering design and implementation, and provides the reference for risk management of deepwater gas field development projects in the future. Related Articles | Metrics | Comments（0）

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Technical Status and Developing Trend of Vertical Lay System for Flexible Pipe Laying CHEN Xiaodong, SUN Kun, ZHANG Xiwei, PENG Yong, YANG Sheng, LIU Wen Ocean Engineering Equipment and Technology    2023, 10 (2): 22-29.   Abstract （101）      PDF（pc） （3941KB）（270）       Knowledge map    Save Flexible pipes are important facility for offshore oil and gas development. Vertical laying technology is a high-speed and efficient method for flexible pipes laying operation, which has been widely used in deepwater development projects in the world. The advantages o fvertical laying in deepwater is analyzed by comparing the two typical laying methods for flexible pipes. The type and system components, structural and layout characteristics, and suppliers for designing and manufacturing vertical laying system are summarized. The future development trend and localization suggestions of vertical laying system is analyzed, which can provide a useful reference for the independent development of vertical laying system equipment in China. Related Articles | Metrics | Comments（0）

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Design of China National Scientific Seafloor Observatory Buoy Platform LI Qing, LU Hai, HAN Rui, WANGJianjun Ocean Engineering Equipment and Technology    2023, 10 (2): 119-125.   Abstract （91）      PDF（pc） （3430KB）（264）       Knowledge map    Save China National Scientific Seafloor Observatory (CNSSO) is a major science and technology infrastructure project approved by the National Development and Reform Commission (NDRC), which aims to observe the ocean via various aspects and fields. Unlike the buoy network operated by the government, CNSSO requires smart data acquisition and control system, underwater acoustic communication, system protection and domestic instrument experiment platform. In response to the realization of these scientific goals, improvements needs to be made for the buoy platform to meet the requirement of CNSSO. Related Articles | Metrics | Comments（0）

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Noise Characteristics and Its Reduction Measures of Air Duct on Offshore Platform Blocks LIU Xinfu, CHENG Hui, LI Hui, LI Bo, GAO Peng, ZHANG Shousen, LIU Bilong Ocean Engineering Equipment and Technology    2023, 10 (2): 51-56.   Abstract （76）      PDF（pc） （2173KB）（250）       Knowledge map    Save Various noises are generated during the operation of air ducts and equipment in block rooms of offshore platforms, which will result in variable effects on the operators and even the lives underwater. Therefore, it is necessary to put forward higher requirements for block noise control of offshore platforms. Considering the coupling effect of turbulence pulsation and fan air excitation, in the paper, the calculation model of the air duct noise of the platform block is established, and the FW-H method is used to analyze the influence of the air duct noise in the ventilation system on the sound pressure level of the platform room; Based on the statistical energy method, we further build the SEA model of the platform modular room, analyze the loss factor in the SEA subsystem and the coupling loss factor between subsystems, predict the dynamic distribution of the noise in the modular room, determine the noise propagation path and dominant component under typical working conditions, and take noise reduction measures for rooms exceeding the standard to achieve the purpose of noise control. The results show that the air duct noise of offshore platform modules is mostly in the middle and low frequency band, and has little effect on the total sound pressure level of the module room. At the same time, low-frequency noise spreads far and high frequency noise attenuates quickly. The remote rooms are mainly affected by low-frequency air noise and structural noise. Therefore, sound insulation and vibration isolation measures are designed respectively for air noise and structural noise. Our platform module rooms meet the requirements of national standards. Related Articles | Metrics | Comments（0）

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Research on Tensile Fatigue of Glass Fiber Reinforced Composites GAO Shuang, LI Zebang, LI Sen, CHU Xingpeng, LIU Xiaobin, LI Xiang Ocean Engineering Equipment and Technology    2023, 10 (2): 57-60.   Abstract （58）      PDF（pc） （1751KB）（227）       Knowledge map    Save Through the tensile-fatigue test of glass fiber reinforced vinyl resin matrix composite laminates at different stress levels, the test data are fitted in logarithmic form to obtain the S-N curve. With the decrease of stress amplitude, the number of endurance limit cycles of glass fiber reinforced composites increases significantly, showing a significant increasing trend. At the same time, it is inferred from the curve that when the stress amplitude decreases again, the number of endurance limit cycles will increase more. The failure process is generally degumming at the interface between glass fiber and matrix, glass fiber fracture and matrix crack; stress concentration will occur in this area, and the resin matrix crack continues to expand until the glass fiber is completely separated from the resin matrix, forming layered glass fiber fracture. Related Articles | Metrics | Comments（0）

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Application of Ship 3D-modeling based on NURBS surface ZHANG Dapeng, YAN Jin, ZHAO Bowen, HOU Ling, ZHU Keqiang Ocean Engineering Equipment and Technology    2023, 10 (3): 24-32.   Abstract （92）      PDF（pc） （7786KB）（223）       Knowledge map    Save NUBRS surface modeling technology is specially designed for the reconstruction of 3D models of complex surface objects. It can accurately and precisely express the contour and shape of the 3D model of target objects based on the form of curves and surfaces. This paper introduces Maxsurf Modeler, a 3D modeling program of hull based on NURBS surface, and gives the process of applying this program to 3D modeling of hull. At the same time, the reliability and applicability of the 3D model are verified by CFD. In the calculation of hydrostatic resistance, the maximum error under 6 working conditions is 2.29%. In seakeeping calculation, the calculation error of pitch motion is the largest, which is 19.32%. The results show that the 3D model completed by Maxsurf Modeler has certain reliability. Related Articles | Metrics | Comments（0）

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Key Testing Technologies and Application of Gate Valve and Connector Used in Subsea Christmas Tree LIU Xiao, ZHANG Ning, ZHU Wei, LI Sen Ocean Engineering Equipment and Technology    2023, 10 (2): 61-66.   Abstract （82）      PDF（pc） （4263KB）（219）       Knowledge map    Save As the key components of the subsea Christmas tree system, underwater valves and wellhead connectors are faced with extremely complex marine service environment, and must be tested to verify that they can meet the performance requirements of relevant standards and specifications for opening, closing, locking, unlocking, sealing, pressure bearing, load bearing, etc. In order to fully simulate the working conditions of underwater low temperature and high pressure as well as the rated water depth under combined loading, the key testing technologies of underwater gate valves and hydraulic wellhead connectors based on API Spec 17D and API Spec 6A standards were studied; a set of combined testing methods, procedures and testing systems were proposed; and the laboratory testing application of domestic equipment was successfully completed. Related Articles | Metrics | Comments（0）

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Research on the Mechanical Performance of Polyester Rope Based on the Dynamic Stiffness Model KANG Zhuang, SUI Haibo, HuangJun, AI Shangmao Ocean Engineering Equipment and Technology    2023, 10 (2): 140-144.   Abstract （124）      PDF（pc） （6034KB）（215）       Knowledge map    Save The taut mooring system using polyester rope as the mooring lines overcomes the heavy weight of the traditional chain mooring material and provides better mooring performance for the floating structures, which attracts much attention in the field of deep-water mooring. The nonlinear mechanical properties of the polyester make it more difficult to predict the tension response of the material. Therefore, it is essential to model this nonlinear relationship accurately. In this paper, based on the absolute nodal coordinate formulation under the condition of large axial tension and combined with the dynamic stiffness model of 8-strand braided polyester rope, the tension response of the polyester line is accurately calculated and analyzed, and the results are compared with the approximate method. The simulation shows that the axial tension of the polyester cable obtained by the accurate model is larger than that of the approximate method. The nonlinear constitutive relationship of the polyester cable displays the phenomenon that the larger stretch, the larger sitffness is. Besides, the approximate method will distort the tension prediction. Therefore, it is necessary to adopt an accurate dynamic stiffness model in calculating the tension response of mooring systems using polyester material.  Related Articles | Metrics | Comments（0）

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Research on the Applicability of Standards for Offshore Facility Structure Monitoring Systems KANG Yongtian, LING Aijun, JIN Xinyue, LIANG Yuanhua, TANG Aipan Ocean Engineering Equipment and Technology    2023, 10 (2): 101-105.   Abstract （69）      PDF（pc） （4469KB）（195）       Knowledge map    Save With the increasing technical requirements for the structural safety of offshore facilities and the rapid development of digital technology, structural health monitoring technology is becoming more widely used in offshore facility structures for monitoring the safety of the structure and ensuring the safety of the facilities. At present, the application of digital twins technology on offshore facilities is emerging, and  the offshore facility structure monitoring system has not formed a mature technical standard so far. This paper studied the standards  of offshore facility structure monitoring system, analyze d the applicability of monitoring system design, manufacturing, installation, commissioning and inspection standards, and provided  technical support for the engineering application of offshore facility structure monitoring systems. Related Articles | Metrics | Comments（0）

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Research on the Connection between Tiller and Rudder of a Large Container Ship JIN Cai, WU Jinxing, LIU Jinhua Ocean Engineering Equipment and Technology    2023, 10 (2): 30-36.   Abstract （150）      PDF（pc） （5690KB）（187）       Knowledge map    Save Ship construction is tending to large-scale development, the size of the supporting tiller of large ships also increases, the procurement cost and construction difficulty will also increases correspondingly. At present, the tiller and the rudder of the ship mainly adopt two connection ways: hydraulic-keyed connection and dry-keyed connection. By analyzing and studying the connection modes between tiller and rudder, this paper obtains the optimal connection mode which meets the requirements,is convenient for construction. The parts are lightweight, which has important engineering significance. Combined with the requirements of classification Society, this paper takes a large container ship as an example, and on the basis of the two traditional connection methods, puts forward the third connection method of hydraulic-keyed connection method. The three connection methods are compared in the paper, and the finite element method is used to check the strength, and the conclusions of push up load, push-up and material yield strength are obtained. In the end, an optimal connection mode which meets the requirements of real ship is obtained, which is convenient for ship yard construction. The designed tiller is lightweight. Related Articles | Metrics | Comments（0）

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Numerical Analysis and Risk Study of Large Offshore Converter Station Transportation and Floatover Installation Xiong Gen, Liang Fusheng, Li Xin, Sun Zhenzhou, Xu Xin, Tian Xinliang, Ocean Engineering Equipment and Technology    2023, 10 (3): 1-12.   Abstract （120）      PDF（pc） （8344KB）（173）       Knowledge map    Save With the development trend of large-scale and ocean-going offshore wind farms, the demand for large-scale offshore converter stations will continue to increase, and their installation problems will gradually receive attention. In this paper, taking the SanXia Rudong offshore converter station as an example, a multi-body dynamic model is established by OrcaFlex software to numerically calculate the transportation and floatover installation process of the converter station, and the motion, acceleration and mooring line force of the barge and converter station in some stages are analyzed. The results show that during the transportation stage, when the significant wave height is the same, the motion amplitude and acceleration of the barge-converter station system increase correspondingly with the increase of the spectral peak period Tp (6~9s), but they are basically within the limit value. During the installation stage, the spectral peak period Tp = 8s at the same wave height will cause greater surge, sway, and yaw motion amplitudes than Tp = 6s and 10s, and more attention should be paid to such working conditions. In addition, head sea conditions are more conducive to the floatover operation. Besides, the risk research of the converter station transportation stage is carried out, and effective risk control measures are proposed to provide a certain reference for the actual large-scale offshore converter station installation operation. Related Articles | Metrics | Comments（0）

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Time-frequency Method Comparison for Wave-induced Fatigue Prediction of Deepwater SCRs HUANG Jun, KANG Zhuang, ZHANG Yansong, AI Shangmao Ocean Engineering Equipment and Technology    2023, 10 (2): 112-118.   Abstract （110）      PDF（pc） （5975KB）（153）       Knowledge map    Save Wave-induced fatigue damage is an important component of deep-water steel catenary riser (SCR) fatigue damage. In this paper, the fatigue damage caused by SCR wave in the South China Sea caused by storm state is predicted through time domain and frequency domain respectively. The difference of platform motion response and riser dynamic response obtained by time domain method and frequency domain method is also analyzed. The prediction results of fatigue damage risk position and damage extreme value are then compared. The applicability of the methods in prediction of deep-ocean risers’ wave-induced fatigue was evaluated. The result show that there is a huge gap between the time domain method and the frequency domain method, and that the damage risk position calculated by the frequency domain method is lagging behind. With the frequency domain method, the wave-induced fatigue cumulative damage is amplified, while the order of magnitude is consistent. Related Articles | Metrics | Comments（0）

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Research Progress and Challenges of Ship Ballast Water Treatment ZHANG Weidong, DU Bin, QU Huifang, LI Tao Ocean Engineering Equipment and Technology    2023, 10 (4): 1-.   Abstract （149）      PDF（pc） （3948KB）（152）       Knowledge map    Save Ship ballast water is one of the main ways for the alien invasion. It is considered as one of the four threats to the marine environment. The ballast water convention established to solve this problem has stipulated the standards for ballast water treatment， which has entered into force on September 6，2019. This paper reviews the background and social needs of the research on ballast water treatment technology， analyzes the characteristics of different ballast water treatment technologies， introduces the latest achievements of the research on ballast water treatment technology in the academic community， and the efforts of the industrial community in the research and development of ballast water treatment systems， and discusses the challenges faced by ballast water treatment at different levels of standards， economy， technology， testing and law. Related Articles | Metrics | Comments（0）

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Research on Digital and Intelligent Transformation of Discrete Offshore Oil and Gas Equipment Manufacturing Industry HE Chen, LUO Chao, LIU Shicong, KANG Dongchun, WANG Liang Ocean Engineering Equipment and Technology    2023, 10 (2): 106-111.   Abstract （99）      PDF（pc） （4845KB）（131）       Knowledge map    Save This paper firstly expounds the impact of the application of digital technology and intelligent on the manufacturing industry technology in the field of information technology. The cutting-edge technologies related to intelligent manufacturing are then introduced in detail, and the latest industry status quo is briefly analyzed. Then, in conjuction with the unique characteristics of equipment construction in the current offshore petroleum engineering industry, it conducts an in-depth analysis, and clarifies the pain points brought to offshore petroleum engineering by the characteristics of discrete equipment manufacturing. Finally, according to the current status of discrete manufacturing, combined with the field practice accumulated over the years, through 3D model design, intelligent robots and other multi-dimensional exploration the digital and intelligent transformation are studied in this paper. Related Articles | Metrics | Comments（0）

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Engineering Exploration and Practice of Key Technology for Floating Offshore Wind Turbine Equipment LI Hongtao, YANG Linlin, QU Xiaoqi, SUN Tao Ocean Engineering Equipment and Technology    2023, 10 (2): 79-88.   Abstract （144）      PDF（pc） （12983KB）（118）       Knowledge map    Save Floating offshore wind turbine equipment has gradually become a hot topic in the development of deep-sea renewable energy. However, there are still a series of technical difficulties and challenges in the commercialization of floating offshore wind turbine. This study systematically combs the key technologies for design and analysis of floating offshore wind turbine equipment. The solutions and analysis methods are put forward regarding six aspects including overall performance analysis, structural global strength, mooring system design, fatigue strength analysis, stability check and dynamic cable design. A set of useful conclusions and suggestions are given through the introduction of actual domestic floating offshore wind turbine engineering project. Engineering exploration and practice are performed on the development of floating offshore wind turbine equipment in China, and it is expected to provide useful reference for the development and expansion of China's floating offshore wind turbine technology. Related Articles | Metrics | Comments（0）

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Strength Design Criterion on Hydrogen Offshore Pipeline WANG Meng, LIANG Guangqiang Ocean Engineering Equipment and Technology    2023, 10 (3): 41-47.   Abstract （67）      PDF（pc） （1547KB）（108）       Knowledge map    Save The design criterions of strength, fracture toughness and hydrogen fatigue crack growth rate of hydrogen offshore pipeline have been studied, and the sensitivity of the FCGR’s model was also studied. This paper can provides a guidance for the engineering design of hydrogen submarine pipeline. Related Articles | Metrics | Comments（0）

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Current Status and Prospects of External Security Technology for Offshore Platforms ZHANG Qingguo, LIU Chunyue, LUO Song, WANG Shuili, LIU Qing Ocean Engineering Equipment and Technology    2023, 10 (4): 92-.   Abstract （47）      PDF（pc） （63262KB）（98）       Knowledge map    Save In response to the current issues of unclear classification， unclear definition， and low universality of external security systems for offshore platforms， a definition of offshore platform security to prevent external human interference and damage is proposed. A universal offshore platform external security system is constructed， and industry standardization system construction ideas are proposed. We review the technical solutions， composition structures， and performance indicators of relevant offshore platform security equipment and systems in major foreign countries， with a focus on the security capabilities of ports， islands， and offshore oil and gas platforms to respond to external threats of human destruction. We provide an overview and explanation of the research progress and typical applications in the field of domestic offshore platform security， and combine actual needs with the current development of new technologies and equipment to prospect offshore platform security technology and equipment. We provide future construction ideas and suggestions， which can provide reference for further research and system construction of offshore platform external security technology. Related Articles | Metrics | Comments（0）

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Processing of Beidou Positioning Error in the Integrated Navigation for Use At Sea Wang Yafeng, Huang Peishuo, , Yu Xiaqiong, Song Lei, Yu Wenbin Ocean Engineering Equipment and Technology    2023, 10 (3): 76-82.   Abstract （96）      PDF（pc） （1558KB）（96）       Knowledge map    Save Taking the SINS/Beidou loose integrated navigation as the object, the processing method of Beidou positioning error at sea is studied. By analyzing the source of Beidou positioning error, it is pointed out that there is a constant deviation of Beidou positioning error in local areas within a short time. This constant deviation can be compensated by the differential data released by the ground differential stations. However, at this stage, the ground differential stations of Beidou system are mainly concentrated in the key areas of China. For overseas areas, especially marine areas, where there is no ground differential station, the common method is to treat the Beidou positioning error as noise, but this method will sacrifice the accuracy of integrated navigation. In this paper, the constant deviation of Beidou positioning is incorporated into the filter state. And the Kalman filter state expansion method is proposed to estimate this constant deviation to improve the integrated navigation accuracy. Finally, the simulation examples show that the method can effectively improve the positioning accuracy. Related Articles | Metrics | Comments（0）

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The Current State of Chemical Injection Metering Valve Technology Wu Lu, Sun Qin, An Weizheng, Zuo Xin, Bai Xiaobo, Yue Yuanlong Ocean Engineering Equipment and Technology    2023, 10 (3): 99-108.   Abstract （96）      PDF（pc） （10473KB）（92）       Knowledge map    Save Subsea chemical injection metering valve is the core chemical injection equipment to ensure the long-term safe operation of the subsea production system and realize the functions of accurate injection and flow metering. In this paper relevant standards for the function and technical requirements of subsea chemical injection are introduced, Then, the subsea chemical injection process is proposed, the installation position and function of subsea chemical injection metering valve are pointed out. Finally, considering the international mainstream subsea chemical injection metering valves, operation principle, power supply and communication, mechanical structure and subsea installation are analyzed. This research can provide somewhat significance for the independent development of our subsea chemical injection metering valve.  Related Articles | Metrics | Comments（0）

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Technical status of subsea pressure and temperature integrated transmitter Han Yunfeng Yue Yuanlong Wei Juan Zuo Xin Sun Hanxuan Ocean Engineering Equipment and Technology    2023, 10 (3): 90-98.   Abstract （52）      PDF（pc） （2290KB）（89）       Knowledge map    Save Subsea production system is widely used in the development of offshore oil and gas resources, and always runs at the position of subsea mud line for a long period. In order to ensure safe operation and reduce the structural complexity as well as the maintenance cost of equipment, it is necessary to equip a highly reliable subsea pressure and temperature transmitter (PTT). So far, the design and manufacture technology of subsea PTT has not been developed in China. On the basis of fully realizing the localization of subsea production system, and planning the industrial distribution of subsea key equipment from technical commanding point, this paper analyzes the technical status of PTT comprehensively. Firstly, the engineering background, the installation position of PTT and its key role in subsea production system are introduced. The working principle of PTT is described as well. Afterwards, the function and technical requirement of the relevant standards for PTT are illuminated. The mechanical structure, component material, power supply, communication, pressure-temperature transmitter precision, resolution and other data parameters are compared and analyzed as well. Finally, the technical difficulties, the problems faced by international procurement, along with the urgency and necessity of localization of  PTT are presented with summary and prospect. Related Articles | Metrics | Comments（0）

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Research and Experimental Verification on Key Technologies of Remote Frequency Conversion Drive for Offshore Oil and Gas WANG Shanfen, GUO Hong, LIU Ying, ZHANG Rong, LUJingjian, ZHOU Zhonghao, GUOJiangyan Ocean Engineering Equipment and Technology    2023, 10 (2): 67-71.   Abstract （48）      PDF（pc） （5532KB）（84）       Knowledge map    Save With the gradual consumption of energy in the world, the exploitation of deep-sea oil and gas fields has gained significant importance as a research topic. At present, the deep-sea underwater production technology has started to develop and put to practice, and the underwater power supply has always been an important factor that restricts the innovation of Chinese underwater production technology. It is very important to carry out the long-distance conversion drive experimental platform analysis simulation and construction. This paper leverages the experimental platform to carry out system resonance analysis, motor start-up and other research, and verifies the test ability of the long-distance frequency conversion drive experimental platform. It shows that the system can effectively simulate the operation state of the actual engineering, and provide further technical support for the research of underwater power supply system. Related Articles | Metrics | Comments（0）

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Finite Element Analysis of Soil Heave during Settlement of Suction Foundation Xu Fan, Deng Yucong, Chen Rumu, Ren Guanglu, Lu Jiaqi Ocean Engineering Equipment and Technology    2023, 10 (3): 125-131.   Abstract （60）      PDF（pc） （1362KB）（83）       Knowledge map    Save Suction foundation is widely used in the installation and fixation of large offshore engineering structures. In this paper, the finite element analysis software ABAQUS is used to establish a three-dimensional large deformation finite element analysis model based on the coupled Euler Lagrange method (CEL). The finite element numerical simulation of the soil plug uplift process during the installation and settlement of suction foundation is carried out. The finite element simulation results and theoretical calculation are comprehensively analyzed, and the mechanism of soil plug uplift and its weakening the ultimate bearing capacity of suction foundation is obtained. Related Articles | Metrics | Comments（0）

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Research on integration lifting technology of J-tube of offshore booster station jacket FENG Yinglei Ocean Engineering Equipment and Technology    2023, 10 (3): 57-64.   Abstract （81）      PDF（pc） （11685KB）（79）       Knowledge map    Save As offshore wind power gradually moves towards the deep sea, the size and weight of offshore booster station jackets are also getting larger. The number of cable protectors of the offshore booster station jackets is large, making installation difficult. If use the installation method of traditional oil and gas jacket’s J-tube, the project duration and cranes will be greatly affected. This paper discusses an integration lifting technology of J-tube and structural piece,which lifts the J-tube and structure in place at the same time, and checks the structural strength and local strength of lifting points under different working conditions. Provide technical basis for construction of wind power technology to break through in deep sea areas. Related Articles | Metrics | Comments（0）

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Research and Application of Heave Compensation Technology in Deep-Sea Mining Engineering YU Dequan, JI Jiangang, XIA Kui, XIA Haihong, HUANG Tianzhong, TAO Jun Ocean Engineering Equipment and Technology    2023, 10 (2): 131-139.   Abstract （97）      PDF（pc） （16741KB）（76）       Knowledge map    Save In this paper, the significance of the research on heave compensation technology in deep-sea mining engineering is described, and the overall plan, working principle as well as workflow of the heave compensator are studied that ensures that the lifting pipe can obtain the supporting force and compensation force during operation, maintain a stationary position relative to the seabed and work steadily. Through the simulation analysis method, the dynamic comprehensive performance of the heave compensation system is studied. The influence law of vibration period, load size, hydraulic line flow resistance, friction and other factors of the mining ships on the compensation effect is also summarized. In addition, the speed-limited safety technology is analyzed, while the functional principle, structural composition and test plan of the speed-limited shut off valve are studied. The safety guarantee effect is verified by the shipment applications. As a result, a more comprehensive research result on the heave compensation technology in deep-sea mining is obtained. Related Articles | Metrics | Comments（0）

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Discussion on the Procedure of Oil Flushing in Complex Pipelines Dong Lei, Liang Tengfei Ocean Engineering Equipment and Technology    2023, 10 (3): 48-51.   Abstract （101）      PDF（pc） （3136KB）（75）       Knowledge map    Save Oil flushing, also known as oil cleaning, is a common process in the construction of offshore platforms. In particular, the hydraulic system has a high requirement for pipeline cleanliness, and usually the pipeline has many branches. So it is difficult to divide the oil flushing package into single line circuits, and the oil flushing quality of each branch cannot be guaranteed. This paper builds models according to parameters of the pipeline system, proposes to analyze the feasibility of the procedure using fluid software simulation before oil flushing operation. Adjusts the oil temperature, kinematic viscosity, flow control and other aspects, and then optimizes the oil flushing procedure to ensure the quality and improve efficiency. Related Articles | Metrics | Comments（0）

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Key techniques and applications of high-speed drilling in Huangyan District Y1 oil and gas field Xu Jia, Yuan Zeming, Zhang Haishan, Zuo Honggang, Wang Xijie Ocean Engineering Equipment and Technology    2023, 10 (3): 52-56.   Abstract （57）      PDF（pc） （1394KB）（74）       Knowledge map    Save The target layer of the Y1 oil and gas field  is deeply buried, with a large dip angle and a typical low porosity and permeability reservoir, there are some difficult problems, such as difficult to release Rop in surface layer, prominent problem of borehole instability in middle and upper layer, poor drill ability in deep layer, low local formation loss pressure and high risk of loss during cementing in long open hole section, etc. , the drilling speed and efficiency of the gas field are restricted. To this end, the corresponding comprehensive technical research, through the analysis of the gas field during the operation of the technical difficulties encountered, and the East China Sea has a mature drilling technology system, key Technologies, such as casing program simplification, oil-based mud system, personalized PDC bit design, and optimized BHA, have been developed to speed up drilling operations in deep and ultra-deep wells in the Y1 oil and gas field, the technical problems which restrict drilling speed and efficiency are solved, and the technical guidance is provided for the scale development of the gas field. Related Articles | Metrics | Comments（0）

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Lifting Methods for Vertical Construction of Offshore Wind Turbine Jacket CHEN Shiwei Ocean Engineering Equipment and Technology    2023, 10 (3): 83-89.   Abstract （54）      PDF（pc） （11405KB）（66）       Knowledge map    Save The offshore wind turbine jacket is relatively small and needs to be built in batches, therefore, it mostly adopts vertical construction process. However, due to the particularity of this type of jacket structure, offshore wind turbine jacket will faces a lot of hard lifting operations during its vertical construction process. Currently, there is no relevant lifting experience and engineering case for reference. Hereto, this paper based on a 2000T class large offshore wind turbine jacket project, introduced the general assembly process of this jacket, analyzed the technical difficulties of its assembly in different process, provides a lifting method for TP and upper jacket integrated lifting and lower jacket turn over lifting. Practice has proved that the method can effectively solve a series of lifting problems, such as difficult arrangement of lifting points, high difficulty of assembly and high requires of crane performance. This paper could help realize the batch construction of offshore wind turbine jacket and provide technical support for other similar projects. Related Articles | Metrics | Comments（0）

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Application of Big Platform Twin hole-in-Monobore Technology in Offshore Bohai Oilfield QI Hengzhi Ocean Engineering Equipment and Technology    2023, 10 (3): 109-112.   Abstract （70）      PDF（pc） （5244KB）（64）       Knowledge map    Save Design and development of Penglai oilfield two period 40 slots (16 dual bore slots) wellhead platform can drill 56 wells. By far, it is the most number of Bohai offshore drilling platform. On the basis of slots and Christmas tree surface layout, considering the design of directional well and the anti-collision problem, this paper describes the installation of the surface casing and cementing procedure. The 56 wells slots drilled from a 40 slot WHP reduces the number and cost of the platform while providing additional wells to meet the reservoir development plan. Thus it plays a guiding role of the development of subsequent oilfield. Related Articles | Metrics | Comments（0）

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Structural Emergency Response Analysis and Application for Deep-water Column Stabilised Units GAO Chang Ocean Engineering Equipment and Technology    2023, 10 (2): 95-100.   Abstract （35）      PDF（pc） （1592KB）（63）       Knowledge map    Save Aiming at the typical structural safety accidents and emergencies of deep-water column stabilised units, in this paper the main safety risks of platform structure are expounded. A closed-loop structural emergency response system is established，which includes dynamic data management before the emergency response, emergency response mechanism, and accident tracking after emergency response, etc. For typical accidents, the contents and recommended methods of structural risk emergency response analysis of deep-water column stabilised units are put forward. The proposed methods can provide useful guidance to the platform operators. Related Articles | Metrics | Comments（0）

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Analysis of the Reason of Corrosion and Prevention Measures for 316L Stainless Steel Pipeline BI Hangming Ocean Engineering Equipment and Technology    2023, 10 (4): 30-.   Abstract （68）      PDF（pc） （5312KB）（62）       Knowledge map    Save The corrosion of stainless steel piping for a precommissioning offshore platform in the South China Sea is sampled and analyzed. The conclusion obtained from the test is that the chloride ion content exceeds the standard leading to serious corrosion of stainless steel pipelines. This paper explores the basic principles of damage caused by chloride ions to 316L stainless steel pipeline. From the perspective of offshore platform pipeline construction， for how to effectively prevent corrosion of stainless steel pipelines， we put forward relevant recommendations， and provide reference for subsequent offshore platform construction projects. Related Articles | Metrics | Comments（0）

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Marine lifting optimization of separated lifting topsides of eight legs central production platform #br# LAN Guoyang, YUAN Yujie, HU Xingtao, SUN Huafeng Ocean Engineering Equipment and Technology    2023, 10 (3): 113-117.   Abstract （69）      PDF（pc） （2903KB）（59）       Knowledge map    Save This article has a successfully put into operation example of a separated lifting topsides of eight legs central production platform in Bohai sea。 According to the idea of integrated design, in the detailed design phase through the marine lifting optimization of separated lifting topsides of eight legs central production platform, it not only reduces the occupation of key production resources such as large floating cranes and the input of labor costs, but also by shortening the offshore construction time to reduce the uncertainty risk of offshore construction. In addition, the redundancy of the structure can be effectively used to achieve the optimization of the structure and achieve the purpose of reducing cost and increasing efficiency. Through the analysis and demonstration of professional computing technology, this article proves the feasibility of this optimization scheme Related Articles | Metrics | Comments（0）

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Study on Ideal Superstructure Design of Ship LIAO Shiyang, LIU Jun, ZENG Wenyuan Ocean Engineering Equipment and Technology    2023, 10 (4): 16-.   Abstract （65）      PDF（pc） （6248KB）（58）       Knowledge map    Save The ideal superstructure means that the superstructure does not bend when the hull is bent， and the normal stress of the superstructure is consistent in the direction of height. Different from the strong superstructure and the light superstructure， the stress level of the ideal superstructure is close to the main deck， which can maximize the utilization of material strength. In this paper， a typical oil tanker is taken as the research object. Based on the composite beam method， considering the influence of shear hysteresis effect， the design method of ideal superstructure is discussed. According to the section characteristics of superstructure， the length of ideal superstructure is explored. Based on the theoretical formula of the ideal superstructure， the design length of the ideal superstructure is obtained according to the parameters of the transverse section of the ship. After the theoretical design scheme of the ideal superstructure is obtained， the stress distribution law of the deck of the ideal superstructure is verified by the finite element method. The verification results show that the normal stress level of the superstructure is close to the main deck， which can provide reference for the design of the early ideal superstructure. Finally， the deck thickness of the superstructure is adjusted to save materials and reduce the center of gravity. Related Articles | Metrics | Comments（0）