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Mechanical Modeling and Analysis of Stability Deterioration of Production Well During Marine Hydrate Depressurization Production

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China Ocean Engineering 2024年第2期38卷 338-351页

作者： SUN Huan-zhao CHANG Yuan-jiang SUN Bao-jiang WANG Kang chen guo-ming LI Hao DAI Yong-guo Centre for Offshore Engineering and Safety Technology China University of Petroleum(East China)Qingdao 266580China School of Petroleum Engineering China University of Petroleum(East China)Qingdao 266580China Jiangsu Shuguang Oil Tools Co. LtdTaizhou 225532China

Different from oil and gas production,hydrate reservoirs are shallow and unconsolidated,whose mechanical properties deteriorate with hydrate ***,the formations will undergo significant subsidence during depressurization,which will destroy the original force state of the production ***,existing research on the stability of oil and gas production wells assumes the formation to be stable,and lacks consideration of the force exerted on the hydrate production well by formation subsidence caused by hydrate decomposition during *** fill this gap,this paper proposes an analytical method for the dynamic evolution of the stability of hydrate production well considering the effects of hydrate *** on the mechanical model of the production well,the basis for stability analysis has been proposed.A multi-field coupling model of the force state of the production well considering the effect of hydrate decomposition and formation subsidence is established,and a solver is *** analytical approach is verified by its good agreement with the results from the numerical method.A case study found that the decomposition of hydrate will increase the pulling-down force and reduce the supporting force,which is the main reason for the stability *** higher the initial hydrate saturation,the larger the reservoir thickness,and the lower the production pressure,the worse the stability or even *** work can provide a theoretical reference for the stability maintaining of the production well.

关键词： natural gas hydrate production well depressurization production formation deformation stability deterioration

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Dynamic Analysis of A Deepwater Drilling Riser with A New Hang-off System

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China Ocean Engineering 2024年第1期38卷 29-41页

作者： LI Yan-wei LIU Xiu-quan WANG Jin-long chen guo-ming CHANG Yuan-jiang SHENG Lei-xiang Centre for Offshore Engineering and Safety Technology China University of PetroleumQingdao 266580China National Engineering Laboratory of Offshore Geophysical and Exploration Equipment China University of PetroleumQingdao 266580China China CNOOC Research Institute Co. Ltd.Beijing 100028China

The safety of risers in hang-off states is a vital challenge in offshore oil and gas engineering.A new hang-off system installed on top of risers is proposed for improving the security of *** approach leads to a challenging problem:coupling the dynamics of risers with a new hang-off system combined with multiple structures and complex *** accurately analyze the dynamic responses of the coupled system,a coupled dynamic model is established based on the Euler-Bernoulli beam-column theory and penalty function method.A comprehensive analysis method is proposed for coupled dynamic analysis by combining the finite element method and the Newmarkβ*** analysis program is also developed in MATLAB for dynamic *** simulation results show that the dynamic performances of the risers at the top part are significantly improved by the new hang-off system,especially the novel design,which includes the centralizer and articulation *** bending moment and lateral deformation of the risers at the top part decrease,while the hang-off joint experiences a great bending moment at the bottom of the lateral restraint area which requires particular attention in design and *** platform navigation speed range under the safety limits of risers expands with the new hang-off system in use.

关键词： deepwater drilling riser new hang-off system dynamic analysis finite element method penalty function method

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基于DEMATEL-ISM的市政道路养护成本影响因素分析

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价值工程 2024年第21期43卷 38-40页

作者：陈明国昆明理工大学建筑工程学院昆明650500 攀枝花市市政公用设施服务中心攀枝花617000

市政道路养护成本的控制在城市管理工作中已逐渐成为焦点,吸引了众多业内人士关注。面对人、材、机械费等直接费用的持续上涨,市政道路养护成本也持续增加。如何在保证养护质量的同时有效控制成本,提高养护资金利用效率,以缓解养护成本... 详细信息

市政道路养护成本的控制在城市管理工作中已逐渐成为焦点,吸引了众多业内人士关注。面对人、材、机械费等直接费用的持续上涨,市政道路养护成本也持续增加。如何在保证养护质量的同时有效控制成本,提高养护资金利用效率,以缓解养护成本上升与政府财政拨款不足的矛盾,已成为市政道路养护领域迫切需要解决的问题。本文通过文献分析、专家筛选与补充得出市政道路养护成本影响因素,然后借助决策评价与实验室分析法(DEMATEL)和解释结构模式(ISM)分析了成本影响因素,通过建立阶梯结构模型,得到各影响因素之间的逻辑关系。这为在市政道路养护成本控制时把握关键和基础因素提供了依据。

关键词：市政道路养护成本 DEMATEL-ISM

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Extraction of the Structure Functions in τ→3πv Decay Using Li Model

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Chinese Physics Letters 1998年第12期15卷 868-870页

作者： XIONG Zhao-hua chen guo-ming chen He-sheng Institute of High Energy Physics Chinese Academy of SciencesBeijing 100039

The structure functions in theτ→3πv decay are extracted using the model proposed by *** predictions of Li model are compared with KS ones and the data from OPAL *** is found that predictions by the model forωA(Q2)are consistent with the data except for in the high energy region(Q2>1.2 GeV2),andωC,ωD,ωE normalized toωA are in reasonable agreement with the experimental *** factors to the Breit-Wigner distribution of a1 and the Lagrangian of this decay are proposed to the model.

关键词： experiment. decay model.

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Numerical Investigation on Dynamic Characteristics of Casing Deformation During Marine Hydrate Production

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China Ocean Engineering 2022年第4期36卷 638-648页

作者： CHANG Yuan-jiang WANG Kang chen guo-ming SUN Bao-jiang SUN Huan-zhao JI Miao-miao Centre for Offshore Engineering and Safety Technology(COEST) China University of Petroleum(East China)Qingdao 266580China College of Petroleum Engineering China University of Petroleum(East China)Qingdao 266580China

Formation subsidence is inevitable during marine hydrate decomposition,and the consequent casing deformation seriously threatens the security of sustainable hydrate *** to insufficient observed data of formation subsidence in field,displacement boundary condition of casing is *** the conventional static methods are inapplicable for the calculation of casing deformation in hydrate production *** present work aims at proposing an approach to investigate dynamic deformation of the casing during hydrate *** the proposed methodology,based on the movement theory of hydrate decomposition front,hydrate decomposition process can be simulated,in which hydrate reservoir strength formation subsidence showed time-dependent *** considering the actual interactions among casing,cement and formation,three models of hydrate production well are developed to reveal the static and dynamic deformation mechanisms of the *** application of the proposed methodology is demonstrated through a case *** show that buckling deformation and bending deformation of casing reduce the passing ability of downhole tools in deformed casing by 4.2%and 7.5%,*** the progress of hydrate production,buckling deformation will increase obviously,while a little increase of bending deformation will occur,as the formation slippage induced by formation inclination is much larger than that caused by hydrate *** proposed approach can provide theoretical reference for improving casing integrity of marine hydrate production.

关键词： hydrate production casing deformation dynamic characteristics formation inclination

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Fabricating Master with Reactive Ion Beam Etching Method

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Chinese Physics Letters 1998年第7期15卷 495-497页

作者： ZOU Zhi-qiang FANG Hong-li FU Xin-ding chen guo-ming Shanghai Institute of Metallurgy Chinese Academy of SciencesShanghai 200050

The fabrication process of glass master or glass etching optical disk using reactive ion beam(RIB)etching method was *** was applied for image *** etching using CF4 gas transferred the pregrooves into the glass *** shape and depth of the pregrooves in the glass is a function of the RIB etcher settings.A glass substrate ofФ130mm with etched pregrooves(track pitch was 1.6μm and groove depth 0.1μm)was obtained,showing that a glass master or glass etching disc can be fabricated by this technique.

关键词： technique glass Master

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Axial Vibration Analysis of the Mud Recovery Line on Deepwater Riserless Mud Recovery Drilling System

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China Ocean Engineering 2014年第3期28卷 381-390页

作者：王国栋陈国明许亮斌殷志明 Centre for Offshore Engineering and Safety Technology China University of Petroleum CNOOC Research Institute

The series connection of multistage pumping module is the common concept of deepwater riserless mud recovery drilling system. In this system, the influence of the mass of pumping module on the vibration of mud recovery line cannot be ignored, and the lumped mass method has been utilized to discretize the mud recovery line. Based on the analysis of different boundary conditions, the paper establishes the axial forced vibration model of the mud recovery line considering the seawater damping, and the vibration model analysis provides the universal solution to the vibration model. An example of the two-stage pumping system has been used to analyze the dynamic response of mud recovery line under different excited frequencies. This paper has the important directive significance for the application of riserless mud recovery drilling technology in deepwater surface drilling.

关键词： riserless mud recovery drilling lumped mass method mud recovery line axial vibration analysis

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Hollow Metal-Organic Framework/MXene/Nanocellulose Composite Films for Giga/Terahertz Electromagnetic Shielding and Photothermal Conversion

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Nano-Micro Letters 2024年第9期16卷 161-179页

作者： Tian Mai Lei chen Pei‑Lin Wang Qi Liu ming‑guo Ma Research Center of Biomass Clean Utilization MOE Engineering Research Center of Forestry Biomass Materials and BioenergyBeijing Key Laboratory of Lignocellulosic ChemistryCollege of Materials Science and TechnologyBeijing Forestry UniversityBeijing 100083People’s Republic of China State Silica-Based Materials Laboratory of Anhui Province Bengbu 233000People’s Republic of China

With the continuous advancement of communication technology,the escalating demand for electromagnetic shielding interference(EMI)materials with multifunctional and wideband EMI performance has become *** the electrical and magnetic components and designing the EMI material structure have attracted extensive interest,but remain a huge ***,we reported the alternating electromagnetic structure composite films composed of hollow metal-organic frameworks/layered MXene/nanocellulose(HMN)by alternating vacuum-assisted filtration *** HMN composite films exhibit excellent EMI shielding effectiveness performance in the GHz frequency(66.8 dB at Kaband)and THz frequency(114.6 dB at 0.1-4.0 THz).Besides,the HMN composite films also exhibit a high reflection loss of 39.7 dB at 0.7 THz with an effective absorption bandwidth up to 2.1 ***,HMN composite films show remarkable photothermal conversion performance,which can reach 104.6℃under 2.0 Sun and 235.4℃under 0.8 W cm^(−2),*** unique micro-and macrostructural design structures will absorb more incident electromagnetic waves via interfacial polarization/multiple scattering and produce more heat energy via the local surface plasmon resonance *** features make the HMN composite film a promising candidate for advanced EMI devices for future 6G communication and the protection of electronic equipment in cold environments.

关键词： Metal-organic frameworks MXene Nanocellulose Electromagnetic shielding Photothermal conversion

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Electrochemical Cascade Annulation for the Synthesis of 3-Sulfanylquinoline Derivatives under Mild Conditions

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Chinese Journal of Chemistry 2024年第16期42卷 1833-1838页

作者： Ke Li ming-Zhong guo Zhuo chen Hao-Ran Li Weisi guo ming Li Lin-Bao Zhang State Key Laboratory Base of Eco-Chemical Engineering College of Chemistry and Molecular EngineeringQingdao University of Science&TechnologyQingdaoShandong 266042China

An efficient electrochemical approach has been developed for the construction of 3-sulfanylquinoline derivatives by treating phenylethynylbenzoxazinanones with disulfides in an undivided *** protocol provided a convenient route to functionalized quinolines with good functional group ***,it does not require any metal catalysts or additives,furnishing a series of biologicalquinolines inmoderatetogoodyields.

关键词： Electrocatalysis Electrooxidation Annulation 3-Sulfany quinoline C3-thioetherification

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Attention-Based CNN Fusion Model for Emotion Recognition During Walking Using Discrete Wavelet Transform on EEG and Inertial Signals

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Big Data Mining and Analytics 2024年第1期7卷 188-204页

作者： Yan Zhao ming guo Xiangyong chen Jianqiang Sun Jianlong Qiu School of Communication Engineering Hangzhou Dianzi UniversityHangzhou 310018China School of Automation and Electrical Engineering Linyi UniversityLinyi 276000China

Walking as a unique biometric tool conveys important information for emotion *** in different emotional states exhibit distinct walking *** this purpose,this paper proposes a novel approach to recognizing emotion during walking using electroencephalogram(EEG)and inertial *** recognition of emotion is achieved by training in an end-to-end deep learning fashion and taking into account multi-modal *** wear virtual reality head-mounted display(VR-HMD)equipment to immerse in strong emotions during *** environment shows excellent imitation and experience ability,which plays an important role in awakening and changing *** addition,the multi-modal signals acquired from EEG and inertial sensors are separately represented as virtual emotion images by discrete wavelet transform(DWT).These serve as input to the attention-based convolutional neural network(CNN)fusion *** designed network structure is simple and lightweight while integrating the channel attention mechanism to extract and enhance *** effectively improve the performance of the recognition system,the proposed decision fusion algorithm combines Critic method and majority voting strategy to determine the weight values that affect the final decision *** investigation is made on the effect of diverse mother wavelet types and wavelet decomposition levels on model performance which indicates that the 2.2-order reverse biorthogonal(rbio2.2)wavelet with two-level decomposition has the best recognition *** experiment results show that the proposed method outperforms other existing state-of-the-art works with an accuracy of 98.73%.

关键词： walking multi-modal fusion virtual reality emotion recognition discrete wavelet transform attention mechanism

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