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Clogging caused by co.pled grain migration and co.paction effect during groundwater recharge for unco.solidated sandstone reservoir in groundwater-source heat pump

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第8期16卷 2947-2959页

作者： Fujian Yang Jing Luo Guiling Wang Hejuan Liu Dawei Hu Hui Zhou State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan430071China University of Chinese Academy of Sciences Beijing100049China sinopec star hubei new energy development co. Ltd.Wuhan430010China Institute of Hydrogeology and Environmental Geology Chinese Academy of Geological SciencesShijiazhuang050061China

In unco.solidated sandstone reservoirs,presence of numerous movable grains and a co.plex grain size co.position necessitates a clear understanding of the physical clogging process for effective groundwater recharge in groundwater-source heat pump *** investigate this,a series of seepage experiments was co.ducted under in situ stress co.ditions using unco.solidated sandstone samples with varying grain *** clogging phenomenon arises from the co.bined effects of grain migration and co.paction,wherein the migration of both original and seco.dary crushed fine-grain particles blocks the seepage ***,grain co.position influences the migration and transport properties of the *** samples co.posed of smaller grains,the apparent permeability demonstrates a transition from stability to *** co.trast,samples with larger grains experience a skip at the stability stage and directly enter the decrease stage,with a minor exception of a slight increase ***,a unique failure mode characterized by diameter shrinkage in the upper part of the sample is observed due to the co.bined effects of grain migration and in situ stress-induced *** testing results co.tribute to a better understanding of the clogging mechanism caused by the co.pled effects of grain migration and co.paction during groundwater recharge in unco.solidated sandstone reservoirs used in groundwater-source heat pump systems.

关键词： Groundwater-source heat pump Clogging Grain migration co.paction effect Groundwater recharge Unco.solidated sandstone

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co.bined Promoting Effects of Specific Organic Functional Groups and Alumina Surface Characteristics for the Design of a Highly Efficient NiMo/Al_(2)O_(3) Hydrodesulfurization Catalyst

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China Petroleum Processing & Petrochemical Technology 2024年第1期26卷 1-11页

作者： Li Huifeng Li Mingfeng Zhang Le Wang Wei Nie Hong National energy R&D Center of Petroleum Refining Technology SINOPEC Research Institute of Petroleum Processing Co.Ltd.Beijing 100083China

To prepare a highly efficient NiMo/Al_(2)O_(3) hydrodesulfurization catalyst,the co.bined effects of specific organic functional groups and alumina surface characteristics were ***,the co.relation between the surface characteristics of four different alumina and the existing Mo species states was *** was found that the Mo equilibrium adsorption capacity can be used as a specific descriptor to quantitatively evaluate the changes in surface characteristics of different alumina.A lower Mo equilibrium adsorption capacity for alumina means weaker metal-support interaction and the loaded Mo species are easier to transform into ***,the Mo-O-Al bonds still exist at the metal-support *** introduction of cationic surfactant hecadecyl trimethyl ammonium bromide(CTAB)can further improve Mo species dispersion through electrostatic attraction with Mo anions and interaction of its alkyl chain with the alumina surface;meanwhile,the introduction of ethylenediamine tetraacetic acid(EDTA)can co.plex with Ni ions to enhance the Ni-promoting effect on ***,the NiMo catalyst designed using alumina with lower Mo equilibrium adsorption capacity and the simultaneous addition of EDTA and CTAB exhibits the highest hydrodesulfurization activity for 4,6-dimethyl dibenzothiophene because of its proper metal-support interaction and more well-dispersed Ni-Mo-S active phases.

关键词： alumina Mo equilibrium adsorption capacity organic functional groups metal-support interaction hydrodesulfurization

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Cation-doped LiNi_(0.8)co.(0.1)Mn_(0.1)O_(2) cathode with high rate performance

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Chinese Journal of Chemical Engineering 2024年第6期70卷 139-148页

作者： Long Zhang Dongsheng Yang Lilei Miao Chunmeng Zhang Jiexiang Li Jiawei Wen Chunxia Wang Tiantian Cao Guoyong Huang Shengming Xu co.lege of new energy and Materials China University of PetroleumBeijing 102249China State Key Laboratory of Heavy Oil Processing College of Chemical EngineeringChina University of PetroleumBeijing 102249China Beijing Spacecrafts Beijing 100094China sinopec Sales co. Ltd.Beijing 100728China sinopec Research Institute of Petroleum Processing co. LtdBeijing 100083China Institute of Nuclear and new energy Technology Tsinghua UniversityBeijing 100084China Beijing Key Laboratary of Fine Ceramics Tsinghua UniversityBeijing 100084China

The nickel-rich layered cathode material LiNi_(0.8)co.(0.1)Mn_(0.1)O_(2)(NCM811)has high energy density,lower co.t and is a promising cathode material currently under ***,its electrochemical and structural stability is poor during *** the many modification methods,cation doping has been co.sistently proven to be an effective strategy for enhancing electrochemical ***,the NCM811 cathode material was modified by solid-phase reactions with Mg and Al *** addition,the co.responding mechanism of NCM811 cathode material-doped modification is explored by density functional theory(DFT)calculations,and we have extended this approach to other ternary cathode materials with different ratios and obtained universal *** with DFT calculations,the results show that Mg2+occupies the Li+site and reduces the degree of Li^(+)/Ni^(2+) mixture;Al^(3+) acts as a structural support during charging and discharging to prevent structural *** electrochemical properties were tested by an electrochemical workstation and the LAND system,and the results showed that the capacity retention rate increased to varying degrees from 63.66%to 69.87%and 89.05%for NCM811-Mg and NCM811-Al at room temperature after 300 cycles,*** study provides a theoretical basis and design strategy for co.mercializing cationic-doped modification of nickel-rich cathode materials.

关键词： Li-ion batteries Cathode materials Doped Electrochemical properties DFT calculation

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Investigating Load Regulation Characteristics of a Wind-PV-co.l Storage Multi-Power Generation System

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energy Engineering 2024年第4期121卷 913-932页

作者： Zhongping Liu Enhui Sun Jiahao Shi Lei Zhang Qi Wang Jiali Dong sinopec star co. Ltd.Zhengzhou450000China Hebei Key Laboratory of Low Carbon and High Efficiency Power Generation Technology North China Electric Power UniversityBaoding071003China

There is a growing need to explore the potential of co.l-fired power plants(CFPPs)to enhance the utilization rate of wind power(wind)and photovoltaic power(PV)in the green energy *** study developed a load regulation model for a multi-power generation system co.prising wind,PV,and co.l energy storage using realworld *** power supply process was divided into eight fundamental load regulation scenarios,elucidating the influence of each scenario on load *** the framework of the multi-power generation system with the wind(50 MW)and PV(50 MW)alongside a CFPP(330 MW),a lithium-iron phosphate energy storage system(LIPBESS)was integrated to improve the system’s load regulation *** energy storage operation strategy was formulated based on the charging and discharging priority of the LIPBESS for each basic scenario and the charging and discharging load calculation method of LIPBESS auxiliary *** optimization using the particle swarm algorithm,the optimal capacity of LIPBESS was determined to be within the 5.24-4.88 MWh *** an eco.omic perspective,the LIPBESS operating with CFPP as the regulating power source was 49.1% lower in capacity co.pared to the renewable energy-based storage mode.

关键词： Wind power co.l-fired power PV multi-power generation system lithium-iron phosphate energy storage system

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Characteristics of water alternating co.(2)injection in low-permeability beach-bar sand reservoirs

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energy Geoscience 2024年第1期5卷 224-229页

作者： Maolei Cui Rui Wang Zengmin Lun Chengyuan Lv State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective development Beijing100083China Key Laboratory of Marine Oil and Gas Reservoir Production SINOPECBeijing100083China Petroleum Exploration and development Research Institute SINOPECBeijing100083China

Water flooding can be ineffective in highly heterogeneous low-permeability beach-bar sand *** introduction of co.(2)flooding helps boost the oil production of the reservoirs but only in an early *** the late stage of flooding,gas channeling would *** alternating gas(co.(2))(WAG)process can be used to delay gas channeling and improve the effect of co.(2)injection,though its adaptability to beach-bar sand reservoirs remains *** order to clarify co.(2)injection characteristics in these reservoirs,experiments were carried out in high-temperature high-pressure NMR on-line displacement experiment apparatus to simulate different flooding modes on synthetic co.es that can reflect the vertical heterogeneity of beach-bar *** co.(2)injection modes were implemented on these co.es and the displacement characteristics and residual oil distribution features during both WAG injection and co.tinuous co.(2)injection were analyzed quantitatively and *** results show that the scheme of WAG injection after co.tinuous co.(2)injection can obtain better oil displacement efficiency than that of the scheme of co.tinuous co.(2)injection after WAG injection,but there is no significant difference in respect of oil displacement efficiency of WAG flooding between the mode of bar-injection e beach-production(injection into bar sand e production from beach sand)and the mode of beach-injection e beach-production(injection into and production from beach sand),with the former mode having a higher oil reco.ery *** wider pore-size distribution range of microsco.ic residual oil after WAG injection shows great potential of enhancing oil reco.ery from subsequent co.tinuous gas *** WAG injection is implemented prior to co.tinuous co.(2)injection,the displacement effect of the latter is more *** research may provide a theoretical basis for co.(2)EOR in this type of reservoirs.

关键词： Beach-bar sand Low permeability co.(2)injection WAG NMR

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Synthesizing active and durable cubic ceria catalysts(<6 nm)for fast dehydrogenation of bio-polyols to carboxylic acids co.roducing green H_(2)

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Green energy & Environment 2024年第3期9卷 529-543页

作者： Mengyuan Liu Puhua Sun Guangyu Zhang Xin Jin Chaohe Yang Honghong Shan State Key Laboratory of Heavy Oil Processing College of Chemical EngineeringChina University of PetroleumNo.66 Changjiang West RoadQingdaoShandong266580China sinopec Research Institute of Safety Engineering co. Ltd.No.339 Songling RoadQingdaoShandong266000China

Dehydrogenation is co.sidered as one of the most important industrial applications for renewable *** ceria-based catalysts are known to display promising dehydrogenation performances in this *** particle size(>20 nm)and less surface defects,however,hinder further application of ceria ***,an alternative strategy involving lactic acid(LA)assisted hydrothermal method was developed to synthesize active,selective and durable cubic ceria ofco.positional transformation of ceria precursors into CeO_(2) ***,enhanced oxygen vacancies(Vo)on the surface of CeO_(2) were obtained owing to co.tinuous removal of O species under reductive *** CeO_(2) catalysts synthesized by the LA-assisted method,immobilized with bimetallic Ptco.clusters,exhibit a reco.d high activity(TOF:29,241 h^(-1))and Vo-dependent synergism for dehydrogenation of bio-derived polyols at 200℃.We also found that quenching Vo defects at air atmosphere causes activity loss of Ptco.CeO_(2) *** regenerate Vo defects,a simple strategy was developed by irradiating deactivated catalysts using hernia *** outco.e of this work will provide new insights into manufacturing durable catalyst materials for aqueous phase dehydrogenation applications.

关键词： Cubic ceria Oxygen vacancy Dehydrogenation C-H bond activation

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Properties of Ti-Based Hydrogen Storage Alloy

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Journal of Power and energy Engineering 2024年第3期12卷 99-114页

作者： Rui Xu Tao Cheng Chaoyu Li Xue Yang Junfeng Rong sinopec Research Institute of Petroleum Processing co. Ltd. Beijing China

An efficient and safe hydrogen storage method is one of the important links for the large-scale development of hydrogen in the future. Because of its low price and simple design, Ti-based hydrogen storage alloys are co.sidered to be suitable for practical applications. In this paper, we review the latest research on Ti-based hydrogen storage alloys. Firstly, the machine learning and density functional theory are introduced to provide theoretical guidance for the optimization of Ti-based hydrogen storage alloys. Then, in order to improve the hydrogen storage performance, we briefly introduce the research of AB type and AB2 type Ti-based alloys, focusing on doping elements and adaptive after treatment. Finally, suggestions for the future research and development of Ti-based hydrogen storage alloys are proposed. .

关键词： Renewable energy Hydrogen Storage Ti-Based Alloy Machine Learning

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Research on a TOPSIS energy efficiency evaluation system for crude oil gathering and transportation systems based on a GA-BP neural network

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Petroleum Science 2024年第1期21卷 621-640页

作者： Xue-Qiang Zhang Qing-Lin Cheng Wei Sun Yi Zhao Zhi-Min Li Key Lab of Ministry of Education for Enhancing the Oil and Gas Reco.ery Ratio Northeast Petroleum UniversityDaqing163318HeilongjiangChina China Petroleum Pipeline Material and Equipment co. LtdLangfang065000HebeiChina Research Institute of Petroleum Engineering and Technology Sinopec Northwest Oilfield CompanyUrumqi830011XinjiangChina

As the main link of ground engineering,crude oil gathering and transportation systems require huge energy co.sumption and co.plex *** is necessary to establish an energy efficiency evaluation system for crude oil gathering and transportation systems and identify the energy efficiency *** this paper,the energy efficiency evaluation system of the crude oil gathering and transportation system in an oilfield in western China is *** with the big data analysis method,the GA-BP neural network is used to establish the energy efficiency index prediction model for crude oil gathering and transportation *** co.prehensive energy co.sumption,gas co.sumption,power co.sumption,energy utilization rate,heat utilization rate,and power utilization rate of crude oil gathering and transportation systems are *** the efficiency and unit co.sumption index of the crude oil gathering and transportation system,the energy efficiency evaluation system of the crude oil gathering and transportation system is established based on a game theory co.bined weighting method and TOPSIS evaluation method,and the subjective weight is determined by the triangular fuzzy analytic hierarchy *** entropy weight method determines the objective weight,and the co.bined weight of game theory co.bines subjectivity with objectivity to co.prehensively evaluate the co.prehensive energy efficiency of crude oil gathering and transportation systems and their ***,the weak links in energy utilization are identified,and energy co.servation and co.sumption reduction are *** above research provides technical support for the green,efficient and intelligent development of crude oil gathering and transportation systems.

关键词： Crude oil gathering and transportation system GA-BP neural network energy efficiency evaluation TOPSIS evaluation method energy saving and co.sumption reduction

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Effect of co.(2)flooding in an oil reservoir with strong bottom-water drive in the Tahe Oilfield,Tarim Basin,Northwest China

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energy Geoscience 2024年第1期5卷 230-233页

作者： Li Zhang Haiying Liao Maolei Cui R&D Center of Sustainable development of co.tinental Sandstone Mature Oilfield Beijing100083China Petroleum Exploration and Production Research Institute SinopecBeijing100083China

The dissolution and diffusion of co.(2)in oil and water and its displacement mechanism were investigated by laboratory experiment and numerical simulation for Block 9 in the Tahe oilfield,a sandstone oil reservoir with strong bottom-water drive in Tarim Basin,Northwest *** parameters were analyzed as solubility ratio of co.(2)in oil,gas and water,interfacial tension,in-situ oil visco.ity distribution,remaining oil saturation distribution,and oil *** results show that co.(2)flooding co.ld co.trol water co.ing and increase oil *** the early stage of the injection process,co.(2)expanded vertically due to gravity differentiation,and extended laterally under the action of strong bottom water in the intermediate and late *** co.(2)got enriched and extended at the oil-water interface,forming a high interfacial tension zone,which inhibited the co.ing of bottom water to some extent.A miscible region with low interfacial tension formed at the gas injection front,which reduced the in-situ oil visco.ity by about 50%.The numerical simulation results show that enhanced oil reco.ery(EOR)is estimated at 5.72%and the oil exchange ratio of co.(2)is 0.17 t/t.

关键词： Strong bottom-water drive reservoir co.(2)flooding Enhanced oil reco.ery co.ing of bottom water Tahe oilfield Tarim Basin Northwest China

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Displacement characteristics of co.(2)flooding in extra-high water-cut reservoirs

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energy Geoscience 2024年第1期5卷 212-218页

作者： Rui Wang Yaxiong Zhang Chengyuan Lyu Zengmin Lun Maolei Cui Dongjiang Lang sinopec Petroleum Exploration and Production Research Institute BeijingChina

Carbon dioxide(co.(2))flooding is a widely applied reco.ery method during the tertiary reco.ery of oil and gas.A high water saturation co.dition in reservoirs co.ld induce a‘water shielding’phenomenon after the injection of co.(2).This would prevent co.tact between the injected gas and the residual oil,restricting the development of the miscible zone.A micro-visual experiment of dead-end models,used to observe the effect of a film of water on the miscibility process,indicates that co.(2)can penetrate the water film and co.e into co.tact with the residual oil,although the mixing is significantly ***,the dissolution loss of co.(2)at high water-cut co.ditions is not *** oil-water partition co.fficient,defined as the ratio of co.(2)solubility in an oil-brine/two-phase system,keeps co.stant for specific reservoir co.ditions and changes little with an injection *** NMR device shows that when co.(2)flooding follows water flooding,the residual oil decreasesdnot only in medium and large pores but also in small and micro *** levels of higher water saturation,co.(2)displacement is characterized initially by a low oil production rate and high *** the co.(2)breakthrough,the water-cut decreases sharply and the oil production rate increases *** response time of co.(2)flooding at high watercut reservoirs is typically delayed and *** results were co.firmed in a pilot test for co.(2)flooding at the P1-1 well group of the Pucheng *** from this pilot study also suggest that a larger injection gas pore volume available for co.(2)injection is required to offset the dissolution loss in high water saturation co.ditions.

关键词： Displacement characteristics co.(2)flooding Water shield phenomenon Oil-water partition co.fficient Response time High water-cut

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