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Effect of mesopore spatial distribution of HZSM-5 catalyst on zinc state and product distribution in 1-hexene aromatization

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Chinese Journal of Chemical engineering 2024年第3期67卷 16-26页

作者： Chenhao Wei Di Gao Guohao Zhang Liang Zhao Jinsen Gao Chunming Xu The State Key Lab of Heavy oil Processing China University of Petroleum(Beijing)Beijing 102249China SINOPEC Research Institute of Petroleum Processing co. Ltd.Beijing 100083China

1-hexene aromatization is a promising technology to co.vert excess olefin in fluid catalytic cracking(FCC)gasoline to high-value benzene(B),toluene(T),and ***,the increasing market demand of xylene has put forward higher requirements for new generation of *** increasing xylene yield in 1-hexene aromatization,the effect of mesopore structure and spatial distribution on product distribution and Zn loading was *** with different mesopore spatial distribution were prepared by post-treatment of parent HZSM-5 zeolite,including NaOH treatment,tetra-propylammonium hydroxide(TPAOH)treatment,and *** was found the evenly distributed mesopore mainly prolongs the catalyst lifetime by enhancing diffusion properties but reduces the aromatics selectivity,as a result of damage of micropores close to the catalyst *** the selectivity of high-value xylene can be highly promoted when the mesopore is mainly distributed interior the ***,the state of loaded Zn was also affected by mesopores spatial *** the optimized catalyst,the xylene selectivity was enhanced by 12.4%co.pared with co.ventional Zn-loaded parent HZSM-5 catalyst at co.version over 99%.It was attributed to the synergy effect of mesopores spatial distribution and optimized acid *** work reveals the role of mesopores in different spatial positions of 1-hexene aromatization catalysts in the reaction process and the influence on metal distribution,as well as their synergistic effect two on the improvement of xylene selectivity,which can improve our understanding of catalyst pore structure and be helpful for the rational design of high-efficient catalyst.

关键词： 1-Hexene aromatization Alkali treatment Xylene selectivity Mesopores Zinc state

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Paleoenvironmental Characteristics of Paleogene Lacustrine Source Rocks in the Western Bozhong Sag,Bohai Bay Basin,china:Evidence from Biomarkers,Major and Trace Elements

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Acta Geologica Sinica(English Edition) 2024年第1期98卷 220-240页

作者： WANG Xiang LIU Guangdi SONG Zezhang SUN Mingliang WANG Xiaolin WANG Feilong CHEN Rongtao GENG Mingyang LI Yishu State Key Laboratory of Petroleum Resources and Prospecting China University of PetroleumBeijing 102249China co.lege of Geosciences China University of PetroleumBeijing 102249China china National offshore oil co. Ltd.(CNOOC)Tianjin Branch CompanyTianjin 300459China CNOOC Research Institute Beijing 100028China

The organic matter(OM)enrichment mechanisms and depositional environment characteristics of lacustrine source rocks in the western Bozhong Sag,Bohai Bay Basin in Northeast china remain *** address these issues,based on Rock-Eval pyrolysis,kerogen macerals,H/C and O/C ratios,GC-MS,major and trace elements,the Dongying Formation Member(Mbr)3(E_(3)d_(3)),the Shahejie Formation mbrs 1 and 2(E_(2)s_(1+2)),and the Shahejie Mbr 3(E_(2)s_(3))source rocks in the western Bozhong Sag were *** above methods were used to reveal their geochemical properties,OM origins and depositional environments,all of which indicate that E_(2)s_(1+2)and E_(2)s_(3)are excellent source rocks,and that E_(3)d_(3)is of the seco.d good quality.E_(3)d_(3)source rocks were formed under a warm and humid climate,mainly belong to fluvial/delta facies,the E_(3)d_(3)sediments formed under weakly oxidizing and freshwater ***,the depositional environments of E_(2)s_(1+2)source rocks were arid and co.d climate,representing saline or freshwater lacustrine facies,and the sediments of E_(2)s_(1+2)belong to anoxic or suboxic settings with large evaporation and *** the period of E_(2)s_(3),the climate became warm and humid,indicating the freshwater lacustrine facies,and E_(2)s_(3)was characterized by freshwater and abundant ***,co.pared with other intervals,the OM origin of E_(3)d_(3)source rocks has noticeable terrestrial *** OM origin of the E_(2)s_(1+2)and E_(2)s_(3)are mainly plankton and *** subsidence and climate change have affected the changes of the depositional environment in the western Bozhong Sag,thus co.trolling the distribution of the source rocks,the geochemical characteristics in the three intervals of lacustrine source rocks have distinct ***,these factors are effective to evaluate the paleoenvironmental characteristics of source rocks by biomarkers,major and trace *** established models

关键词： petroleum geology source rocks depositional environments biomarkers major elements trace elements Bozhong Sag

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A Gel-Based Solidification Technology for Large Fracture Plugging

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Fluid Dynamics & Materials Processing 2024年第3期20卷 563-578页

作者： Kunjian Wang Ruibin He Qianhua Liao Kun Xu Wen Wang Kan Chen Tianjin Branch of CNOOC(china)co. Ltd.Tianjin300450China Jingzhou Jiahua Technology co. Ltd.Jingzhou434001China

Fault fractures usually have large openings and co.siderable extension. Acco.dingly, cross-linked gel materials aregenerally co.sidered more suitable plugging agents than water-based gels because the latter often undergo co.taminationvia formation water, which prevents them from being effective over long times. Hence, in this study, aset of oil-based co.posite gels based on waste grease and epoxy resin has been developed. These materials havebeen observed to possess high co.pressive strength and resistance to the aforementioned co.tamination, therebyleading to notable increase in plugging success rate. The co.pressive strength, thickening time, and resistance toformation water pollution of these gels have been evaluated indoors. The results show that the co.pressivestrength of the gel can reach 11 MPa;additionally, the related gelation time can be co.trolled to be more than3 h, thereby providing a safe co.struction time;Invasion of formation water has a small effect on the gel strengthand does not shorten the thickening time. All co.sidered performance indicators of the oil-based gel co.firm itssuitability as a plugging agent for fault fractures.

关键词： Drilling loss fault fracture oil-based gel co.pressive strength gel plugging

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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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Experimental Investigation on Vertical Hydraulic Transport of Ores in Deepsea Mining

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china Ocean engineering 2024年第1期38卷 42-53页

作者： LIU Lei LIU Jian-cheng LI Xin XU Li-xin ZHANG Xiu-zhan State Key Laboratory of Ocean engineering Shanghai Jiao Tong UniversityShanghai 200240China School of Naval Architecture Ocean and Civil EngineeringShanghai Jiao Tong UniversityShanghai 200240China Sanya Yazhou Bay Institution of Deep-sea Sci-Tech Shanghai Jiao Tong UniversitySanya 572000China china Merchants Marine And offshore Research Institute co. Ltd.Shenzhen 518067China china Merchants Deepsea Research Institute(Sanya)co. Ltd.Sanya 572000China School of Naval Architecture and Ocean engineering Jiangsu University of Science and TechnologyZhenjiang 212100China

Deepsea mining has been proposed since the 1960s to alleviate the lack of resources on *** hydraulic transport of co.lected ores from the seabed to the sea surface is co.sidered the most promising method for industrial *** the present study,an indoor model test of the vertical hydraulic transport of particles was co.ducted.A nonco.tact optical method has been proposed to measure the local characteristics of the particles inside a vertical pipe,including the local co.centration and particle *** hydraulic gradient of ore transport was evaluated with various particle size distributions,particle densities,feeding co.centrations and mixture flow *** transport,the local co.centration is larger than the feeding co.centration,whereas the particle velocity is less than the mixture *** qualitative effects of the local co.centration and local fluid velocity on the particle velocity and slip velocity were *** local fluid velocity co.tributes significantly to particle velocity and slip velocity,whereas the effect of the local co.centration is marginal.A higher feeding co.centration and mixture flow velocity result in an increased hydraulic *** effect of the particle size gradation is slight,whereas the particle density plays a crucial role in the transport.

关键词： deepsea mining vertical hydraulic transport experiment flow characteristics

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Experimental Study on engineering Behavior of Solidified Soil for Sco.r Repair and Protection

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china Ocean engineering 2024年第4期38卷 625-635页

作者： WU Xiao-ni LI Ru-yu SHU Jian TANG Chao CHEN Jin-jian WANG Hui-li JIANG Hai-li WANG Xiao State Key Laboratory of Ocean engineering Department of Civil EngineeringShanghai Jiao Tong UniversityShanghai 200240China Shanghai Road and Bridge Group co. Ltd.Shanghai 200433China Shanghai engineering Research Center of Urban Infrastructure Renewal Shanghai 200032China Jiangsu Kunze Technology co. Ltd.Nanjing 210000China

A new sco.r co.ntermeasure using solidified slurry for offshore foundation has been proposed *** solidified slurry is pumped to seabed area around foundation for sco.r protection or pumped into the developed sco.r holes for sco.r repair as the fluidized material solidifies *** the pumping operation and solidification,the engineering behaviors of solidified slurry require to be co.sidered synthetically for the reliable application in sco.r repair and protection of ocean engineering such as the pumpability related flow value,flow diffusion behavior related rheological property,anti-sco.r performance related retention rate in solidification and bearing capacity related strength property after *** this study,a series of laboratory tests are co.ducted to investigate the effects of mix proportion(initial water co.tent and binder co.tent)on the flow value,rheological properties,density,retention rate of solidified slurry and unco.fined co.pressive strength(UCS).The results reveal that the flow value increases with the water co.tent and decreases with the binder *** the solidified slurry exhibits Bingham plastic behavior when the shear rate is larger than 5 s^(-1).The Bingham model has been employed to fit the rheology test results,and empirical formulas for obtaining the density,yield stress and visco.ity are established,providing scientific support for the numerical assessment of flow and diffusion of solidified *** rate of solidified slurry decreases with the water flow velocity and flow value,which means the pumpability of solidified slurry is co.trary to anti-sco.r *** unco.fined co.pressive strength after solidification reduces as the water co.tent increases and binder co.tent decreases.A design and application procedure of solidified soil for sco.r repair and protection is also proposed for engineering reference.

关键词： sco.r repair and protection solidified soil pumpability strength flow properties anti-sco.r performance

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Prediction on Failure Pressure of Pipeline co.taining co.rosion Defects Based on ISSA-BPNNModel

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Energy engineering 2024年第3期121卷 821-834页

作者： Qi Zhuang Dong Liu Zhuo Chen Petrochina Changqing oilfield co.pany The Second Gas Production PlantXi’an710000China Petrochina Changqing oilfield co.pany Safety and Environmental Supervision Department Co.Ltd.Xi’an710000China Sinopec Northwest oilfield co.pany The Second Oil Production Plant Co.Ltd.Urumqi830016China

oil and gas pipelines are affected by many factors,such as pipe wall thinning and pipeline *** prediction of failure pressure of oil and gas pipelines can provide technical support for pipeline safety *** at the shortco.ings of the BP Neural Network(BPNN)model,such as low learning efficiency,sensitivity to initial weights,and easy falling into a local optimal state,an Improved Sparrow Search Algorithm(ISSA)is adopted to optimize the initial weights and thresholds of BPNN,and an ISSA-BPNN failure pressure prediction model for co.roded pipelines is *** 61 sets of pipelines blasting test data as an example,the prediction model was built and predicted by MATLAB software,and co.pared with the BPNN model,GA-BPNN model,and SSA-BPNN *** results show that the MAPE of the ISSA-BPNN model is 3.4177%,and the R2 is 0.9880,both of which are superior to its co.parison *** the ISSA-BPNN model has high prediction accuracy and stability,and can provide support for pipeline inspection and maintenance.

关键词： oil and gas pipeline co.rosion defect failure pressure prediction sparrow search algorithm BP neural network logistic chaotic map

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The mechanisms of thermal solidification agent promoting steam diversion in heavy oil reservoirs

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Petroleum Science 2024年第3期21卷 1902-1914页

作者： Zhan-Xi Pang Qian-Hui Wang Qiang Meng Bo Wang Dong Liu State Key Laboratory of Petroleum Resources and engineering China University of Petroleum(Beijing)Beijing102249China Liaohe oilfield Institute CNPC ChinaPanjin124000LiaoningChina Henan oilfield Institute Sinopec ChinaNanyang473400HenanChina Tianjin Branch of china National offshore oil co.pany(CNOOC)ltd. Tianjin300452China

At high cycles of steam huff&puff,oil distribution in reservoirs beco.es stronger heterogeneity due to steam *** solidification agent can be used to solve this *** solution is a lowvisco.ity liquid at normal temperature,but it can be solidified above 80℃.The plugging degree is up to 99%at 250℃.The sweep efficiency reaches 59.2%,which is 7.3%higher than pure steam *** addition,simultaneous injection of visco.ity reducer and/or nitrogen foams can further enhance oil *** mechanism of this technology depends on its strong plugging ability,which changes the flowing pattern of steam to effectively mobilize remaining *** reducer and nitrogen foams further expand the sweep range and extends the effective ***,thermal solidification agent can plug steam channeling paths and adjust steam flowing direction to significantly enhance oil reco.ery at high cycles of steam huff&puff.

关键词： Heavy oil reservoir Steam huff&puff Steam channeling Steam diversion Plugging performance Mechanism analysis

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TBAB hydrate formation and growth in a microdevice under static and dynamic co.ditions

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Petroleum Science 2024年第2期21卷 1396-1404页

作者： Xingxun Li Ming Liu Qingping Li Weixin Pang Guangjin Chen Changyu Sun State Key Laboratory of Heavy oil Processing China University of Petroleum BeijingBeijing102249China State Key Laboratory of Natural Gas Hydrate CNOOC Research Institute Co.Ltd.Beijing100027China

The natural gas hydrate has beco.e one of the most promising future green energy sources on the *** natural gas hydrates mostly exist in the sediments with porous structure, so a solid understanding of the hydrate formation and growth processes in the porous medium is of significance for the exploitation of natural gas hydrate. The micro-packed bed device is one of the efficient microfluidic devices in the engineering field, but it has been rarely used for the hydrate-based research. In this study, a transparent micro-packed bed device filled with glass beads was developed to mimic the porous co.dition of sediments, and used to in-situ visualize the hydrate formation and growth habits in the pore spaces under both static and dynamic co.ditions. For the static experiment, two types of hydrate growth patterns in porous medium were observed and identified in the micro-packed bed device, which were the grainco.ting growth and pore-filling growth. For the dynamic co.dition, the hydrate formation, growth,distribution habits and hydrate blockage phenomena in the pore spaces were in-situ visually *** impacts of flowrate and subco.ling on the pressure variation of the micro-packed bed and the duration of the hydrate growth under dynamic flow co.dition in pores were in-situ monitored and analyzed. The higher flowrate co.ld result in the faster hydrate growth and more severe blockage in pores, but the effect of subco.ling co.dition might be less significant at the high flowrate.

关键词： Hydrate formation Hydrate growth Microdevice In-situ measurement

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Optimizing the Diameter of Plugging Balls in Deep Shale Gas Wells

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Fluid Dynamics & Materials Processing 2024年第3期20卷 609-624页

作者： Yi Song Zheyu Hu Cheng Shen Lan Ren Xingwu Guo Ran Lin Kun Wang Zhiyong Zhao Shale Gas Research Institute PetroChina Southwest Oil&Gasfield CompanyChengdu610056China State Key Laboratory of oil&Gas Reservoir Geology and Exploitation Southwest Petroleum UniversityChengdu610500China National Pipe Network Group Sichuan East Natural Gas Transmission Pipeline co. Ltd.Wuhan430205China Fracturing Acidizing co.pany Downhole Operation Company of Chuanqing Drilling Engineering Co.Ltd.Chengdu610213China

Deep shale gas reserves that have been fractured typically have many relatively close perforation holes. Due to theproximity of each fracture during the formation of the fracture network, there is significant stress interference,which results in uneven fracture propagation. It is co.mon practice to use “balls” to temporarily plug fractureopenings in order to lessen liquid intake and achieve uniform propagation in each cluster. In this study, a diameteroptimization model is introduced for these plugging balls based on a multi-cluster fracture propagationmodel and a perforation dynamic abrasion model. This approach relies on proper co.sideration of the multiphasenature of the co.sidered problem and the interaction force between the involved fluid and solid phases. Acco.dingly,it can take into acco.nt the behavior of the gradually changing hole diameter due to proppant co.tinuousperforation erosion. Moreover, it can provide useful information about the fluid-dynamic behavior of the co.sideredsystem before and after plugging. It is shown that when the diameter of the temporary plugging ball is1.2 times that of the perforation hole, the perforation holes of each cluster can be effectively blocked.

关键词： Deep shale gas fracture propagation fluid mechanics fluid-solid co.pling perforation hole abrasion

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