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An Integrated Structural Strength Analysis Method for Spar Type Floating Wind Turbine

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china ocean engineering 2016年第2期30卷 217-230页

作者：胡志强刘毅王晋 State Key Laboratory of ocean engineering Shanghai Jiao Tong UniversityShanghai 200240China Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration Shanghai 200240China china National Offshore oil corporation Research Institute Beo'ing 100028China COTEC Offshore engineering Solution HoustonTexas 77079USA

An integrated structural strength analysis method for a Spar type floating wind turbine is proposed in this paper,and technical issues related to turbine structure modeling and stress combination are also *** NREL-5MW ＂Hywind＂ Spar type wind turbine is adopted as study ***-domain dynamic coupled simulations are performed by a fully-coupled aero-hydro-servo-elastic tool,FAST,on the purpose of obtaining the dynamic characteristics of the floating wind turbine,and determining parameters for design load cases of finite element *** design load cases are identified,and finite element analyses are performed for these design load *** structural stresses due to wave-induced loads and wind-induced loads are calculated,and then combined to assess the structural strength of the floating wind *** feasibility of the proposed structural strength analysis method for floating wind turbines is then validated.

关键词： floating wind turbine structural strength analysis method dynamic coupled simulation finite element analysis

Progress and trends in hydrate based desalination(HBD) technology:A review

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Chinese Journal of Chemical engineering 2019年第9期27卷 2037-2043页

作者： Jianan Zheng Fanbao Cheng Yuanping Li Xin Lü Mingjun Yang Key Laboratory of ocean Energy Utilization and Energy Conservation of Ministry of Education Dalian University of TechnologyDalian 116024China Institute of Science and Technology Shenzhen BranchChina National Offshore Oil CorporationGuangzhou 510420China CNOOC Research Institute Co.ltd. Beijing 100027China

The shortage of freshwater boosts the development of seawater desalination technology. As a novel method, the hydrate based desalination technology has been put forward for decades and achieved considerable development in the past years. This review focuses on the experimental progress at the aspects of the hydrate former choice, formation promotion and ion removal efficiency and conceptive innovation of hydrate separation and energy utilization. It should be noted that gaseous hydrate former with low formation pressure and insoluble liquid hydrate former are worthy for further study. Besides, the water migration caused by propane deserves to be investigated much more deeply for the potential value of wide application. Moreover, the utilization proposal of LNG cold energy brings more possibility of commercial application. In a word, the hydrate based desalination technology is hopefully an environment friendly, low-cost and widely used desalination technology in the near future.

关键词： Gas hydrate Desalination Separation Phase equilibria Hydrocarbons Mixture

Ribbon bridge in waves based on hydroelasticity theory

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Frontiers of Structural and Civil engineering 2009年第1期3卷 57-62页

作者： Cong WANG Shixiao FU Weicheng CUI china Offshore oil engineering Co. Ltd.Tianjin 300451China State Key Laboratory of ocean engineering Shanghai Jiao Tong UniversityShanghai 200030China china Ship Scientific Research Center Wuxi 214082China

For the design and operation of a floating bridge,the understanding of its hydroelastic behavior in waves is of great *** paper investigated the hydroelastic performances of a ribbon bridge under wave action.A brief introduction on the estimation of dynamic responses of the floating bridge and the comparisons between the experiments and estimation were *** on the 3D hydroelasticity theory,the hydroelastic behavior of the ribbon bridge modeled by finite element method(FEM)was analyzed by employing the mode superposition *** the relevant comparisons between the numerical results and experimental data obtained from one tenth scale elastic model test in the ocean basin were *** is found that the present method is applicable and adaptable for predicting the hydroelastic response of the floating bridge in waves.

关键词： hydroelasticity ribbon bridge wave finite element method(FEM)

Thermal-Fluid-Structure Coupling Analysis of Flexible Corrugated Cryogenic Hose

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china ocean engineering 2022年第4期36卷 658-665页

作者： YANG Liang LIU Miao-er LIU Yun LI Fang-qiu FAN Jia-kun LIU Fu-peng LU Zhao-kuan YANG Jian-ye YAN Jun CNOOC Gas&Power Group Co. Ltd.Beijing 100028China CNOOC Research Institute Co. Ltd.Beijing 100028China Offshore oil engineering Co. Ltd.Tianjin 300461China Ningbo Institute of Dalian University of Technology Ningbo 315016China State Key Laboratory of Structural Analysis for Industrial Equipment Department of Engineering MechanicsInter-national Research Center for Computational MechanicsDalian University of TechnologyDalian 116024China

This work presents a numerical investigation of the thermal–fluid–structure coupling behavior of the liquid natural gas(LNG)transported in the flexible corrugated cryogenic hose.A three-dimensional model of the corrugated hose structure composed of multiple layers of different materials is established and coupled with turbulent LNG flow and heat transfer models in the commercial software ANSYS *** flow transport behavior,heat transfer across the hose layers,and structural response caused by the flow are *** studies are performed to evaluate the impacts of inlet flow rate and thermal conductivity of insulation material on the temperature and structural stress of the corrugated *** study found that,compared with a regular operating condition,higher inlet flow velocities not only suppress the heat gain of the LNG but also lower the flow-induced structural *** insulation layer exhibits excellent performance in maintaining the temperature at the fluid–structure interface,showing little temperature change with respect to material thermal conductivity and ambient *** simulation results may contribute to the research and design of the flexible corrugated cryogenic hoses and provide guidance for safer and more efficient field operations.

关键词： flexible corrugated cryogenic hose LNG computational fluid dynamics thermal–fluid–structure coupling

Experimental Study on Sloshing Characteristics in the Elastic Tank Based on Morlet Wavelet Transform

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china ocean engineering 2018年第4期32卷 400-412页

作者： JIANG Mei-rong ZHONG Wen-jun YU Jian-xing LIU Pei-lin YIN Han-jun WANG Shou-dong MA Yu-xiang State Key Laboratory of Hydraulic engineering Simulation and Safety Tianjin UniversityTianjin 300072China Offshore oil engineering Co. Ltd.CNOOCTianjin 300451China CNOOC Research Institute Co. Ltd.CNOOCBeijing 100028China Transport Planning and Research Institute Ministry of TransportBeijing 100028China State Key Laboratory of Coastal and Offshore engineering Dalian University of TechnologyDalian 116024China

Hydroelastic effect of sloshing is studied through an experimental investigation. Different excitation frequencies are considered with low-fill-depth and large amplitude. Morlet wavelet transform is introduced to analyze the free surface elevations and sloshing pressures. It focuses on variations and distributions of the wavelet energy in elastic tanks. The evolutions of theoretical and experimental wavelet spectra are discussed and the corresponding Fourier spectrums are compared. Afterwards, average values of the wavelet spectra are extracted to do a quantitative study at various points. From the wavelet analysis, sloshing energies are mainly distributed around the external excitation frequency and expanded to high frequencies under violent condition. In resonance, experimental wavelet energy of the elevation in elastic tanks is obviously less than that in the rigid one; for sloshing pressures, the elastic wavelet energy close to the rigid one and conspicuous impulse is observed. It recommends engineers to concern the primary natural frequency and impulsive peak pressures.

关键词： sloshing elastic tank wavelet transform free surface elevation pressure

Stochastic Failure Analysis of Reinforced Thermoplastic Pipes Under Axial Loading and Internal Pressure

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china ocean engineering 2022年第4期36卷 614-628页

作者： WANG Yang-yang LOU Min WANG Yu WU Wu-gang YANG Feng School of Petroleum engineering China University of Petroleum(East China)Qingdao 266580China Key Laboratory of Unconventional oil&Gas Development(china University of Petroleum(East china)) Ministry of EducationQingdao 266580China Kunming Shipborne Equipment Research and Test Center China Shipbuilding Industry CorporationKunming 650051China Cangzhou Mingzhu Plastic Co. Ltd.Cangzhou 061000China

This study explores how parametric uncertainties in the production affect failure tensile loads of reinforced thermoplastic pipes(RTPs)under combined loading *** stress distributions in RTPs are examined with three-dimensional(3D)elasticity theory,and the analytical micromechanics of composites are *** evaluate the failure mechanisms for RTPs,3D Hashin–Yeh failure criteria are combined with the damage evolution model to establish a progressive failure *** theoretical model has been validated through numerical simulations and axial tensile tests *** analyze how randomness of relevant parameters affects the first-ply failure(FPF)tensile load and final failure(FF)tensile load in RTPs,many samples are produced with the Monte–Carlo *** stochastic analysis results are statistically evaluated through the Weibull probability density distribution *** the randomness of production parameters,the failure tensile load of RTPs fluctuates near the mean *** the ply number at the reinforced layer increases,the dispersion of failure tensile load increases,with a high probability that the FPF tensile load of RTPs is lower than the mean value.

关键词： reinforced thermoplastic pipes micromechanics evaluation progressive failure stochastic analysis

Aliphatic biomarker signatures of early Oligocene-early Miocene source rocks in the central Qiongdongnan Basin:Source analyses of organic matter

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Acta oceanologica Sinica 2023年第3期42卷 1-18页

作者： Min Xu Dujie Hou Xiong Cheng Jun Gan Xinde Xu Gang Liang Wenjing Ding School of Energy Resources China University of GeosciencesBeijing 100083China Key Laboratory of Marine Reservoir Evolution and Hydrocarbon Accumulation Mechanism Ministry of EducationBeijing 100083China Beijing Key Laboratory of Unconventional Natural Gas Geological Evaluation and Development engineering Beijing 100083China Exploration and Development Resource Institute Hainan Branch of China National Offshore Oil CorporationHainan 570300China china National Offshore oil corporation(CNOOC)Research Institute Co. Ltd.Beijing 100028China

The geochemical signatures of fifty-four rock samples and three supplementary drill stem test(DST)oils from the Yacheng-Sanya formations in the central Qiongdongnan Basin(CQB)were *** of the early Oligocene-early Miocene(36–16 Ma)palaeovegetation and source analyses of organic matter(OM)were conducted using aliphatic biomarkers in ancient sediments and DST *** the interpreted aquatic and terrigenous OM contributed to the CQB source rocks(SRs)but had varying relative *** four distribution patterns derived from n-alkanes,terpanes,and steranes are representative of four OM composition models of the Yacheng-Sanya SRs,including model A,model B,model C,and model D,which were classified based on the increasing contribution from terrigenous OM relative to aquatic *** terrigenous higher plantderived biomarkers,including oleanane,des-A-oleanane,C_(29)ααα20R sterane,bicadinanes,the C_(19)/(C_(19)+C_(23))tricyclic terpane ratio,and other n-alkane-derived ratios suggest that angiosperms had increased proportions in the palaeoflora from early Oligocene to early Miocene,and the bloom of terrigenous higher plants was observed during deposition of upper Lingshui Formation to lower Sanya *** findings are consistent with the incremental total organic carbon and free hydrocarbons+potential hydrocarbons(S_1+S_2)in the lower Lingshuilower Sanya strata with a significant enrichment of OM in the E_3l_1-N_1s_2 *** maturity-and environmentsensitive aliphatic parameters of the CQB SRs and DST oils suggest that all the samples have predominantly reached their early oil-generation windows but have not exceeded the peak oil windows,except for some immature Sanya Formation *** addition,most of the OM in the analysed samples was characterised by mixed OM contributions under anoxic to sub-anoxic ***,terrestrial-dominant SRs were interpreted to have developed mainly in the Lingshui-Sanya formations and were deposit

关键词： aliphatic biomarkers early Oligocene-early Miocene organic matter sources palaeovegetation reconstruction Qiongdongnan Basin

Reliability analysis of marine risers with narrow and long corrosion defects under combined loads

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Petroleum Science 2014年第1期11卷 139-146页

作者： Hu Xianwei Zhou Canfeng Duan Menglan An Chen Offshore oil and Gas Research Center China University of Petroleum china National oil & Gas Exploration and Development corporation Research Center of Energy engineering Advanced Joining Technology Beijing Institute of Petrochemical Technology

A marine riser,one of the most important components of offshore oil/gas transportation,needs to be designed to eliminate the risks caused by complex ocean environments,platform displacement and internal corrosion,*** this study,a new analytical-numerical assessment approach is proposed in order to quantitatively investigate the reliability of internally corroded risers under combined loads including axial tension and internal ***,an analytical solution of the limit state function of intact risers under combined loads is obtained,which is further modified by the non-dimensional corrosion depth （d/ t） for the risers with a narrow and long corrosion *** relationship between d/t and limited internal pressure is obtained by finite element analysis and nonlinear *** an advanced first-order reliability method （HL-RF） algorithm,reliability analysis is performed to obtain the failure probability,the reliability index and the *** results are further verified by Monte-Carlo importance *** proposed approach of reliability analysis provides an accurate and effective way to estimate the reliability of marine risers with narrow and long corrosion defects under combined loads.

关键词： Marine riser corrosion defect combined loads reliability calculation reliability verification

Intelligent production optimization method for a low pressure and low productivity shale gas well

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Petroleum Exploration and Development 2022年第4期49卷 886-894页

作者： ZHU Qikang LIN Botao YANG Guang WANG Lijia CHEN Man College of Artificial Intelligence China University of PetroleumBeijing 102249China College of Safety and ocean engineering China University of PetroleumBeijing 102249China College of Information Science and engineering China University of PetroleumBeijing 102249China Sichuan Shale Gas Exploration and Development Co.ltd Neijiang 641100China china National Petroleum corporation Southwest oil and Gas Field Company Sichuan Changning Natural Gas Development Co.ltd Changning 644000China

Shale gas wells frequently suffer from liquid loading and insufficient formation pressure in the late stage of *** address this issue,an intelligent production optimization method for low pressure and low productivity shale gas well is *** on the artificial intelligence algorithms,this method realizes automatic production and monitoring of gas *** method can forecast the production performance of a single well by using the long short-term memory neural network and then guide gas well production accordingly,to fulfill liquid loading warning and automatic intermittent *** with adjustable nozzle,the method can keep production and pressure of gas wells stable automatically,extend normal production time of shale gas wells,enhance automatic level of well sites,and reach the goal of refined production management by making production regime for each *** tests show that wells with production regime optimized by this method increased 15%in estimated ultimate reserve(EUR).Compared with the development mode of drainage after depletion recovery,this method is more economical and can increase and stabilize production effectively,so it has a bright application prospect.

关键词： shale gas low pressure and low productivity gas well production optimization artificial intelligence long short-term memory neural network adjustable nozzle