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Research on the falling film flow and heat transfer characteristics of FLNG spiral wound heat exchanger under sea conditions

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petroleum Science 2022年第3期19卷 1276-1290页

作者： Chong-Zheng Sun Liang Liu Yu-Xing Li Jian-Lu Zhu College of Pipeline and Civil Engineering/Shandong Provincial Key Laboratory of Oil&Gas storage and transportation Safety/Qingdao Key Laboratory of Circle Sea Oil&Gas storage and transportation Technology China University of PetroleumQingdaoShandong266580China

As the key equipment of floating liquefied natural gas(FLNG)process,the performance of spiral wound heat exchanger(SWHE)influences operation costs and reliability of the whole *** sea conditions destroy the falling film flow state of the refrigeration and then affect the heat transfer performance of FLNG *** order to design and optimize the SWHE,a cryogenic experimental device of FLNG process and a numerical model of falling film flow have been constructed to study the effects of sea conditions on the falling film flow and heat transfer characteristics of *** cryogenic experimental results show that the pitching conditions have larger effects on the heat transfer performance than *** the pitching angle of 7°,the natural gas temperature and gaseous refrigerant temperature increase by 3.22°C and 7.42°C,*** flow rates of refrigerant and feed natural gas have a great impact on the heat transfer performance of SWHE under pitching and compound sloshing *** the tilt angle increases to 9°,the tube structure with outer diameter D=8 mm and pipe spacing S=4 mm is recommended to reduce the drying area of the pipe wall surface.

关键词： FLNG Spiral wound heat exchanger Falling film flow Cryogenic heat transfer Sea condition

Flow pattern and pressure drop of gas-liquid two-phase swirl flow in a horizontal pipe

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Journal of Central South University 2019年第9期26卷 2528-2542页

作者： RAO Yong-chao DING Bo-yang WANG Shu-li WANG Zi-wen ZHOU Shi-dong Jiangsu Key Laboratory of Oil-gas storage and transportation Technology Changzhou 213016China School of petroleum Engineering Changzhou UniversityChangzhou 213016China

The gas-liquid two-phase swirl flow can increase the gas-liquid two-phase contact area and enhance the heat and mass transfer efficiency between gas and *** swirl flow has important practical application value for promoting gas hydrate formation and ensuring the flow safe of natural gas hydrate *** experimental section was made of plexiglass pipe and the experimental medium was air and *** flow pattern of the gas-liquid two-phase swirl flow in the horizontal pipe was divided,according to a high-definition camera and the overall characteristics of the gas-liquid *** flow pattern map of the gas-liquid two-phase swirl flow in a horizontal pipe was *** influence of the flow velocity and vane parameters on pressure drop was *** types of gas-liquid two-phase swirl flow pressure drop models was *** homogeneous-phase and split-phase pressure drop models have good prediction on swirl bubble flow,swirl dispersed flow,swirl annular flow and swirl stratified flow,and the predictive error band is not more than 20%.

关键词： swirl flow two-phase flow flow pattern swirl number pressure drop

Modification strategies for non-aqueous, highly proton-conductive benzimidazole-based high-temperature proton exchange membranes

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Chinese Chemical Letters 2024年第4期35卷 43-51页

作者： Yunfa Dong Shijie Zhong Yuhui He Zhezhi Liu Shengyu Zhou Qun Li Yashuai Pang Haodong Xie Yuanpeng Ji Yuanpeng Liu Jiecai Han Weidong He National Key Laboratory of Science and Technology on Advanced Composites in Special Environments and Center for Composite Materials and StructuresHarbin Institute of TechnologyHarbin 150080China School of petroleum Engineering Chongqing University of Science and TechnologyChongqing 401331China School of Physics University of Electronic Science and Technology of ChinaChengdu 610054China MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and storage School of Chemistry and Chemical EngineeringHarbin Institute of TechnologyHarbin 150001China Chongqing Research Institute Harbin Institute of TechnologyChongqing 401151China School of Mechanical Engineering Chengdu UniversityChengdu 610106China

High-temperature proton exchange membranes(HT-PEMs) possess excellent thermal and outstanding electrochemical stability, providing an avenue to realize high-temperature proton exchange membranes fuel cells(HT-PEMFCs) with both superior power density and long-term durability. Unfortunately, polybenzimidazole(PBI), a typical material for conventional HT-PEMs, fails to compromise the high nonaqueous proton conductivity and high mechanical properties, thus hindering their practical *** efficient nonaqueous proton conduction is crucial for HT-PEMFC, and many insightful research works have been done in this area. However, there still lacks a report that integrates the host-guest interactions of phosphoric acid doping and the structural stability of polymers to systematically illustrate modification strategies. Here, we summarize recent advancements in enhancing the nonaqueous proton conduction of HT-PEMs. Various polymer structure modification strategies, including main chain and side group modification, cross-linking, blocking, and branching, are reviewed. Composite approaches of polymer, including compounding with organic porous polymers, filling the inorganic components and modifying with ionic liquids, etc., are also covered in this work. These strategies endow the HT-PEMs with more free volume, nanophase-separated structure, and multi-stage proton transfer channels, which can facilitate the proton transportation and improve their performance. Finally, current challenges and future directions for further enhancements are also outlined.

关键词： Benzimidazole Nonaqueous proton conduction Free volume Nanophase-separated structure Structure modification

Investigations of methane adsorption characteristics on marine-continental transitional shales and gas storage capacity models considering pore evolution

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petroleum Science 2024年第4期21卷 2273-2286页

作者： Chen-Gang Lu Xian-Ming Xiao Zhen-Qian Xue Zhang-Xin Chen Yin-Tao Dong Yue Feng Gang Li School of Energy Resources China University of Geosciences (Beijing) School of Civil and Environmental Engineering Nanyang Technological University Chemical and petroleum Engineering University of Calgary Eastern Institute of Technology (tentative) CNOOC Research Institute

Methane adsorption is a critical assessment of the gas storage capacity(GSC) of shales with geological conditions. Although the related research of marine shales has been well-illustrated, the methane adsorption of marine-continental transitional(MCT) shales is still ambiguous. In this study, a method of combining experimental data with analytical models was used to investigate the methane adsorption characteristics and GSC of MCT shales collected from the Qinshui Basin, China. The Ono-Kondo model was used to fit the adsorption data to obtain the adsorption parameters. Subsequently, the geological model of GSC based on pore evolution was constructed using a representative shale sample with a total organic carbon(TOC) content of 1.71%, and the effects of reservoir pressure coefficient and water saturation on GSC were explored. In experimental results, compared to the composition of the MCT shale, the pore structure dominates the methane adsorption, and meanwhile, the maturity mainly governs the pore structure. Besides, maturity in the middle-eastern region of the Qinshui Basin shows a strong positive correlation with burial depth. The two parameters, micropore pore volume and non-micropore surface area, induce a good fit for the adsorption capacity data of the shale. In simulation results, the depth,pressure coefficient, and water saturation of the shale all affect the GSC. It demonstrates a promising shale gas potential of the MCT shale in a deeper block, especially with low water saturation. Specifically,the economic feasibility of shale gas could be a major consideration for the shale with a depth of 60% in the Yushe-Wuxiang area. This study provides a valuable reference for the reservoir evaluation and favorable block search of MCT shale gas.

关键词： High-pressure methane adsorption Marine-continental transitional shale gas Ono-Kondo model Adsorption thermodynamics Gas storage capacity model

Green tribology:Fundamentals and future development

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Friction 2013年第2期1卷 186-194页

作者： Si-wei ZHANG School of Mechanical and storage and transportation Engineering China University of Petroleum20 Xueyuan RdPO Box 902Beijing 100083China

As green tribology is a new field of tribology still in its infancy,understanding its fundamentals is essential for its further *** this article,a brief historical retrospective on the emergence of green tribology is introduced first,and then the definition,objectives,and disciplinary features of green tribology are *** particular,the technological connotations of green tribology are expounded ***,the developing directions of this new area are *** findings may contribute to laying the foundation of further advancement in green tribology.

关键词： green tribology technological connotations environmental impact biological impact developing directions

Casing life prediction using Borda and support vector machine methods

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petroleum Science 2010年第3期7卷 416-421页

作者： Xu Zhiqian Yan Xiangzhen Yang Xiujuan College of Mechanical and Electronic Engineering China University of Petroleum Dongying Shandong 257061 China College of storage ＆ transportation and Architectural Engineering China University of Petroleum Dongying Shandong 257061 China

Eight casing failure modes and 32 risk factors in oil and gas wells are given in this paper. According to the quantitative analysis of the influence degree and occurrence probability of risk factors, the Borda counts for failure modes are obtained with the Borda method. The risk indexes of failure modes are derived from the Borda matrix. Based on the support vector machine （SVM）, a casing life prediction model is established. In the prediction model, eight risk indexes are defined as input vectors and casing life is defined as the output vector. The ideal model parameters are determined with the training set from 19 wells with casing failure. The casing life prediction software is developed with the SVM model as a predictor. The residual life of 60 wells with casing failure is predicted with the software, and then compared with the actual casing life. The comparison results show that the casing life prediction software with the SVM model has high accuracy.

关键词： Support vector machine method Borda method life prediction model failure modes riskfactors

Solidification crack characteristics and sensitivity of peritectic steel

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Journal of Iron and Steel Research International 2024年第7期31卷 1668-1679页

作者： Ya-qiang Li Jian-hua Liu Zi-ming Wang Ying-ying Li Yang He Xiao-wei Li department of Automotive Engineering Hebei Vocational University of Technology and EngineeringXingtai 054000HebeiChina Hebei Special Vehicle Modification Technology Innovation Center Hebei Vocational University of Technology and EngineeringXingtai 054000HebeiChina Institute of Engineering Technology University of Science and Technology BeijingBeijing 100083China School of petroleum and Natural Gas Engineering Changzhou UniversityChangzhou 213164JiangsuChina

The characteristics and sensitivity of solidification cracks in peritectic steels were investigated using directional solidifi-cation *** cracks were observed in both hypoperitectic steels(12CrlMoV,15CrMo)and hyper-peritectic steel(20CrMo)during solidification at growth velocities of 15,50,and 80 pm/*** the dendritic boundaries,sulphide precipitates were found,promoting crack *** on the statistical analysis of interdendritic cracks in peritectic steels,the area ratio(RA)of interdendritic cracks in a directional solidification structure was proposed to evaluate the crack sensitivity of peritectic ***,the crack sensitivities of peritectic steels(12CrlMoV,15CrMo,and 20CrMo)were tested,evaluated,and compared with the surface crack rates of three types of steels produced from a steel *** results demonstrated that RA was in good agreement with that of the steel plant,and the crack sensitivity of 12CrlMoV steel was the strongest,followed by that of 15CrMo and 20CrMo ***,RA can be used to evaluate the crack sensitivity of peritectic steel.

关键词： Peritectic steel-Directional solidification Growth velocity Dendritic structure Solidification crack Crack sensitivity

Dynamic characteristics of the pipeline inspection gauge under girth weld excitation in submarine pipeline

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petroleum Science 2022年第2期19卷 774-788页

作者： Hang Zhang Meng-Qi Gao Biao Tang Can Cui Xue-Feng Xu College of Mechanical and storage and transportation Engineering China University of Petroleum-BeijingBeijing102249China CNPC offshore Engineering Co.Ltd Beijing102200China

Pipeline inner inspection technology based on Pipeline Inspection Gauge(PIG),is the primary means for ensuring the safety of submarine *** dynamic characteristics of a PIG can change abruptly with the excitation of obstacles such as girth welds inside the pipeline,which would result in failure or inaccuracy of the inspection *** study establishes a dynamic model of the PIG sealing disc based on Kelvin spring damping in the circumferentially confined *** axial vibration differential equations of the PIG is examined in ***/ADAMS is used to conduct the dynamic simulation of the PIG at different motion velocities and center of mass positions while passing through the girth weld *** indicate that the axial vibration caused by the girth weld intensifies substantially as the speed of the PIG increases,while the pitch and vertical vibrations exhibit a significant decline with an increase in the motion *** change in the PIG’s center of mass positions has little effect on its axial vibration,while the pitch and vertical vibration conditions are significantly different in the same circumstances.

关键词： Pipeline inspection gauge Multi-system model Dynamic response Shock vibration Girth weld Submarine pipeline

A MODEL FOR PREDICTING PHASE INVERSION IN OIL-WATER TWO-PHASE PIPE FLOW

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Journal of Hydrodynamics 2006年第3期18卷 310-314页

作者： GONG Jing LI Qing-ping YAO Hai-yuan YU Da department of Oil and Gas storage and transportation China University of Petroleum （Beijing） Beijing 102249China China National Offshore Oil Cooperation Research Center Jing Xin Mansion Beijing 100027 China

Experiments of phase inversion characteristics for horizontal oil-water two-phase flow in a stainless steel pipe loop （25.7 mm inner diameter,52 m long） are conducted. A new viewpoint is brought forward about the process of phase inversion in oil-water two-phase pipe flow. Using the relations between the total free energies of the pre-inversion and post-inversion dispersions, a model for predicting phase inversion in oil-water two-phase pipe flow has been developed that considers the characteristics of pipe flow. This model is compared against other models with relevant data of phase inversion in oil-water two-phase pipe flow. Results indicate that this model is better than other models in terms of calculation precision and applicability. The model is useful for guiding the design for optimal performance and safety in the operation of oil-water two-phase pipe flow in oil fields.

关键词： two-phase flow oil water phase inversion,prediction model