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Effect of mechanical vibration process parameters on the cement plugs properties for abandoned wells

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Petroleum Science 2023年第4期20卷 2428-2441页

作者： Hang-Ming Liu Yang-Ye he Ji-Fang Wan Lin Chen xian-Zhong Yi Yuan-Hua Zhou Yu-xian he xiang-Gui Ming Lu Ren Cooperative Innovation Center of Unconventional Oil and Gas Yangtze University(Ministry of Education&Hubei Province)WuhanHubei430100China School of Mechanical Engineering Yangtze UniversityJingzhouHubei434023China CNPC Engineering Technology R&D Company Limited Beijing102206China College of Safety and Ocean Engineering China University of Petroleum-BeijingBeijing102249China Engineering Technology Research Institute CNPC Bohai Drilling Engineering Co.Ltd.Tianjin300457China

A high-quality plug of the abandoned wellbore is considered an essential technical aspect of the oil and gas well abandonment technology system. This paper presents a method of active mechanical excitation to enhance the quality of wellbore plug barriers. An indoor simulation platform is developed, and the effects of different combinations of vibration frequency, amplitude and duration on the properties of the wellbore plug cement material are investigated. It is observed that the optimal combination of excitation parameters occurs at a vibration frequency of 15 Hz, a vibration time of 6 min, and a vibration amplitude of 3 mm. Compared with the condition without the vibration process, the cementing strength, compressive strength, and tensile strength of wellbore cement plug with the optimal mechanical vibration process could increase by 51%, 38% and 20%, respectively, while the porosity decreases by 5%. As determined by scanning electron microscopy of the set cement's microstructure, mechanical vibration effectively eliminates internal porosity and improves the set cement's density. The optimal excitation parameters obtained from the test can guide the design of the vibration plugging tool. The designed vibration plugging tool is simulated in the near field. The cement plug cementation quality tester tests the vibrating and non-vibrating samples, and the cementation ratio is calculated. The test results show that the average cementation ratio of vibrating samples is 0.89375, and that of non-vibrating samples is 0.70625, and the cementation quality is improved by 27%. It is concluded that it not only provides essential data for the design of mechanical vibration plug apparatus, on-site vibration plugs, and the development of operational specifications for vibration plugs, but also provides solid engineering guidance.

关键词： Plugging and abandonment Cement plug Vibration Mechanical properties Microstructure

Controlled synthesis of core-shell Fe_(2)O_(3)@N-C with ultralong cycle life for lithium-ion batteries

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Chinese Chemical Letters 2022年第2期33卷 1037-1041页

作者： Hui Huang Lingjun Kong Wei Shuang Wei Xu Jie he xian-he Bu School of Materials Science and Engineering TKL of Metal and Molecule Based Material ChemistryNankai UniversityTianjin 300350China Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education) College of ChemistryNankai UniversityTianjin 300071China

Development of low-cost electrode materials with long cycle life and high volumetric capacity is im-portant for large-scale applications of lithium-ion batteries(LIBs).here,an electrode made from Fe_(2)O_(3) encapsulated with N-doped carbon(Fe_(2)O_(3)@N-C)via ZIF-8 coating and carbonization process is reported.A cavity was generated between the Fe_(2)O_(3)and N-C material during the carbonization process that is conducive to alleviating the volume expansion of Fe_(2)O_(3).As a result,the Fe_(2)O_(3)@N-C composite exhibits a high specific capacity(1064 mAh/g at 0.1 A/g)and cycle stability(803.6 mAh/g at 1.0 A/g after 1100 cycles)when used as the LIB *** addition,the influence of carbonization under air on the LIB per-formance was investigated by controllably changing the crystal phase of Fe_(2)O_(3)and the thickness of the carbon *** work provides a new method for the design and fabrication of yolk-shell composite electrodes for LIBs and other applications.

关键词： Lithium-ion batteries Anode Core-shell structure Fe_(2)O_(3) N-doped carbon

Functional molecular materials

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Chinese Chemical Letters 2018年第2期29卷 217-218页

作者： Jialiang Xu Chengfen Xing xian-he Bu Tianjin University Tianjin 300350 China hebei University of Technology Tianjin 300401 China Nankai University Tianjin 300071 China

Molecular materials, together with metals, ceramics, and polymer materials, are among the most important materials. The research efforts on molecular materials are targeting three main aspects, namely the assembly technique, multi-functionality, and their diverse application. In this regard, the main attention from the community is focused on the identification and construction of novel molecular materials with high performance for applications in the fields such as the optoelectronic devices and biological or medicine-related materials. This is a truly multi- disciplinary research field driven by the joint efforts of researchers from all different backgrounds including （but not limited to） Organic and Inorganic Chemistry, Supramolecular Chemistry, Semiconductor Molecules and Devices, Materials Science, as well as the Biological Chemistry. This special issue, themed on ＂Functional Molecular Materials＂, consists of 5 review articles and 19 original research papers, and covers a broad spectrum of important aspects in the research of functional molecular materials, ranging from the approaches for self-assembly and characterization of functional molecular systems, to their diverse applications in biological systems and optoelectronic materials and devices.

关键词： NLO Functional molecular materials

Materials chemistry at Nankai University: A special issue dedicated to the 100th anniversary of Nankai University

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Science China Materials 2019年第11期62卷 1505-1506页

作者： Dongbing Zhao Jialiang Xu xian-he Bu Jun Chen College of Chemistry Nankai UniversityTianjin300071China School of Materials Science and Engineering National Institute for Advanced MaterialsNankai UniversityTianjin300350China

It is our great honor to dedicate this special issue of Science China Materials to Nankai University(NKU)in celebration of its 100th *** by two famous patriotic educators Xiu Yan and Boling Zhang in1919,NKU is one of China’s top universities with a long tradition in *** has been playing essential roles as a pioneer in the course of China’s modernization with the aim of“Knowing China and Serving China”.Chemistry at NKU has a rich history.

关键词： Nankai University special issue dedicated the 100th anniversary

Microstructure and mechanical properties of TiN/AlN multilayers deposited by filtered vacuum arc deposition

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中国有色金属学会会刊：英文版 2004年第z1期14卷 234-237页

作者： ZHANG Xu ZHANG Hui-xing ZHANG Tong-he WU xian-ying Key Laboratory of Beam Technology and Material Modification of Ministry of Education Institute of Low Energy Nuclear Physics Beijing Normal UniversityBeijing Radiation Center Beijing 100875 China Key Laboratory of Beam Technology and Material Modification of Ministry of EducationInstitute of Low Energy Nuclear Physics Beijing Normal UniversityBeijing Radiation Center Beijing 100875 China Key Laboratory of Beam Technology and Material Modification of Ministry of EducationInstitute of Low Energy Nuclear Physics Beijing Normal UniversityBeijing Radiation Center Beijing 100875 China Key Laboratory of Beam Technology and Material Modification of Ministry of EducationInstitute of Low Energy Nuclear Physics Beijing Normal UniversityBeijing Radiation Center Beijing 100875 China

Nanometer TiN/AlN multilayers were prepared on silicon substrate by filtered vacuum arc *** structures of the nanometer TiN/AlN multilayer were studied by using X-ray diffraction. The 12 nm TiN/AlN multiplayer is composed of cubic TiN structure and hexagonal wurzite AlN structure, but the 2 nm period multilayer is composed of face centered cubic structure TiN and AlN with strong (200) texture. The surface roughness, hardness and elastic modulus of multilayer are dependent on the period of multilayer. The hardness of the TiN/AlN multilayers is higher than that suggested by a simple rule of mixture. The peaking hardness of nanometer TiN/AlN multilayers at period of 2 nm is about 42 GPa, much higher than that of 12 nm. The wear resistance of the nanometer TiN/AlN multilayers was also studied.

关键词： multilayer filtered arc nanometer wear

A Scalable Pillar Layered Metal-Organic Framework for Natural Gas Purification

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Chemical Research in Chinese Universities 2024年第4期40卷 675-681页

作者： LU Nan LAN Lan GAO Qiang LI Na BU xian-he School of Materials Science and Engineering Nankai UniversityTianjin300350P.R.China State Key Laboratory of Elemento-Organic Chemistry College of ChemistryNankai UniversityTianjin300071P.R.China School of Environmental and Chemical Engineering Jiangsu University of Science and TechnologyZhenjiang212003P.R.China

One-step harvest of high-purity methane(CH_(4))from ternary propane/ethane/methane(C_(3)H_(8)/C_(2)H_(6)/CH_(4))mixtures remains a desirable yet challenging goal for natural gas ***,adsorbents either suffer from high capacity and selectivity,or are caught in a dilemma of scalable ***,we demonstrate a scalable pillar layered metal-organic framework Ni-MOF for highly efficient one-step CH_(4)***-MOF exhibits high C_(2)H_(6)and C_(3)H_(8)uptakes of 83.3 and 86.1 cm^(3)/g at 298 K and 100 kPa and remarkable C_(2)H_(6)/CH_(4)(50/50,volume ratio,21.5)and C_(3)H_(8)/CH_(4)(50/50,volume ratio,212.0)***,high C_(2)H_(6)(42.2 cm^(3)/g at 10 kPa)and C_(3)H_(8)(64.7 cm^(3)/g at 5 kPa)capacities in the low-pressure region at 298 K were realized on Ni-MOF,suggesting the strong affinities of Ni-MOF towards C_(2)H_(6)and C_(3)H_(8).Furthermore,the dynamic breakthrough experiments revealed that purifying CH_(4)from natural gas in one-step can be achieved in Ni-MOF with high-purity(>99.8%)and productivity(346.0 cm^(3)/g).Most significantly,the production of Ni-MOF can be scalably synthesized at room temperature,rendering it promising potential for industrial *** combined advantages of exceptional separation performance,scalability,and cycle stability of Ni-MOF pave the way for one-step CH_(4)purification from natural gas.

关键词： Metal-organic framework Adsorption and separation Natural gas purification Scale-up synthesis

Recent Advances on Metal-Organic Frameworks in the Conversion of Carbon Dioxide

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Chinese Journal of Chemistry 2021年第2期39卷 440-462页

作者： Xiongli Liu Jinli Li Na Li Baiyan Li xian-he Bu School of Materials Science and Engineering National Institute for Advanced MaterialsTKL of Metal and Molecule-Based Material ChemistryNankai UniversityTianjin300350 China College of Chemistry State Key Laboratory of Elemento-Organic ChemistryNankai UniversityTianjin300071 China

With the development of modern industry,global warming is becoming a challenging issue due to the emissions of large quantities of greenhouse gases,mainly carbon dioxide(CO_(2)).The conversion of CO_(2)to useful compounds is considered as an effective and economic way to solve such a climate ***-organic frameworks(MOFs)are an emerging class of porous crystalline materials that have shown great potential in the conversion of CO_(2).The advantages of MOFs in CO 2 conversion lie in their high surface areas,adjustable pore size,and high *** importantly,desirable functional sites can be easily designed and precisely installed to the pore wall of target MOFs by pre-assembly and/or post-synthetic modification(PSM)*** review summarizes the recent advances in constructing MOF catalysts for the application in CO_(2)*** believe that the design and synthesis of MOF catalysts for CO_(2)conversion can be a promising way to solve the“greenhouse effect”.

关键词： Metal-organic frameworks Catalysis Carbon dioxide fixation Fine chemicals Small-molecule compounds

Quasistatic Magnetic Field Generation by an Intense Ultrashort Laser Pulse in Underdense Plasma

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Chinese Physics Letters 2000年第10期17卷 746-748页

作者： ZheNG Chun-Yang ZHU Shao-ping he xian-Tu Institute of Applied Physics and Computational Mathematics P.O.Box 8009Beijing 100088

The quasistatic magnetic field created in the interaction of intense ultrashort laser pulses with underdense plasmas has been investigated by two-dimensional particle *** relativistic ponderomotive force and plasma wave excited in self-modulation processes can drive intense electron current mainly in the propagation *** a result,an azimuthal,multi-mega Gauss order quasi-static magnetic field can be generated around the laserbeam.

关键词： ultrashort intense Pulse

Aggregation-induced emission materials for nonlinear optics

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Aggregate

Aggregate 2021年第3期2卷 21-39页

作者： Xiao Han Fei Ge Jialiang Xu xian-he Bu School of Materials Science and Engineering National Institute for Advanced MaterialsNankai UniversityTianjinP.R.China

Aggregation-induced emission(AIE)is a vital photophysical phenomenon that the luminogens in the concentrated or aggregated cases will engender the dramatically boosted emission in comparison with the dispersive *** this extraordinary emitting capacity exactly resolves the aggregation-caused quenching(ACQ)situations residing in the traditional luminophores,the booming AIE luminogens have drawn tremendous interest owing to their advanced performances and colossal potential applications in various *** exploitations of AIE molecules also drive the research interests in the midst of these AIE materials toward the nonlinear optical(NLO)*** combination of AIE and NLO effects have nurtured some unforeseen properties of AIE materials and extended their application ***,some NLO-active AIE materials have been wielded in many crucial applications,for example,optical limiting,laser,bioimaging,and photodynamic ***,the impacts of aggregate on the NLO effect also deserve deep considerations and pursuits,and the modifications of aggregates promise an easy,efficient,and prompt avenue to tune the NLO properties of *** recent achievements and progress in the NLO properties of AIE materials have been summarized in this *** second-order and third-order NLOs of the AIE materials have been introduced and their correlative applications have been discussed.

关键词： aggregate aggregation-induced emission nonlinear optics