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The effects of various factors on spontaneous imbibition in tight oil reservoirs

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petroleum Science 2024年第1期21卷 315-326页

作者： cheng Liu tian-ru Wang Qing You Yue-{2. Du Guang Zhao Cai-Li Dai School of Energy resources China University of GeosciencesBeijing100083PR China School of petroleum engineering China University of PetroleumQingdao266580ShandongPR China

Slickwater fracturing fluids have gained widespread application in the development of tight oil reservoirs. After the fracturing process, the active components present in slickwater can directly induce spontaneous imbibition within the reservoir. Several variables influence the eventual recovery rate within this procedure, including slickwater composition, formation temperature, degree of reservoir fracture development, and the reservoir characteristics. Nonetheless, the underlying mechanisms governing these influences remain relatively understudied. In this investigation, using the Chang-7 block of the Changqing Oilfield as the study site, we employ EM-30 slickwater fracturing fluid to explore the effects of the drag-reducing agent concentration, imbibition temperature, core permeability, and core fracture development on spontaneous imbibition. An elevated drag-reducing agent concentration is observed to diminish the degree of medium and small pore utilization. Furthermore, higher temperatures and an augmented permeability enhance the fluid flow properties, thereby contributing to an increased utilization rate across all pore sizes. reduced fracture development results in a lower fluid utilization across diverse pore types. This study deepens our understanding of the pivotal factors affecting spontaneous imbibition in tight reservoirs following fracturing. The findings act as theoretical, technical, and scientific foundations for optimizing fracturing strategies in tight oil reservoir transformations.

关键词： Tight oil reservoir Spontaneous imbibition Nuclear magnetic resonance Slickwater fracturing fluid Fluid utilization degree

Degradation of warm permafrost and talik formation on the Qinghai-Tibet plateau in 2.06-2.2.

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Advances in Climate Change research 2024年第2期15卷 275-284页

作者： Qi-Hang MEI Ji CHEN You-Qian LIU Shou-Hong ZHANG Jing-Yi ZHAO tian-chun DONG Jun-{2. WANG Yao-Jun ZHAO Beiluhe Observation and research Station of Frozen Soil engineering and Environment Key Laboratory of Cryospheric Science and Frozen Soil EngineeringNorthwest Institute of Eco-Environmental and ResourcesChinese Academy of SciencesLanzhou 730000China china railway Qinghai-Tibet Group Co.Ltd Xining 810007China university of Chinese Academy of Sciences Beijing 100049China

permafrost is degrading globally,particularly those with low thermal stability on the Qinghai-Tibet plateau,owing to climate ***,the inadequacy of direct research on permafrost degradation based on in-situ monitoring limits the prediction of permafrost degradation and engineering *** study explored the processes and modes of permafrost degradation into talik by analyzing ground temperature data from five points in the hinterland of the Qinghai-Tibet plateau from 2.06 to *** results showed that the degradation of the warm permafrost layer with a geothermal gradient of zero occurred simultaneously in the top and bottom *** rate of permafrost degradation from the top down and bottom up increase during the degradation process,but the increase of the former is more drastic after the formation of thawed ***,the construction of the Qinghai-Tibet railway changed the degradation modes of the permafrost in adjacent natural sites through horizontal heat transfer,particularly after through talik formation under the *** findings suggest that taking countermeasures before or immediately after forming thawed interlayer is more *** evaluating the thermal impact of projects in warm permafrost regions,special attention should be given to the horizontal heat transfer process that may result from the formation of a through talik.

关键词： Warm permafrost Degradation Talik Qinghai-Tibet plateau Climate change

Failure mechanism and infrared radiation characteristic of hard siltstone induced by stratification effect

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Journal of Mountain Science 2024年第3期21卷 1058-1074页

作者： cheng Yun SONG Zhanping XU Zhiwei YANG Tengtian tian Xiaoxu School of civil engineering Yancheng Institute of TechnologyYancheng 224051China School of civil engineering Xi'an University of Architecture and TechnologyXi'an 710055China Shaanxi Key Laboratory of Geotechnical and Underground Space engineering Xi'an 710055China china railway Construction Bridge engineering Bureau Group Co. Ltd.Tianjin 300300China

The deformation in sedimentary rock induced by train loads has potential threat to the safe operation of tunnels. This study investigated the influence of stratification structure on the infrared radiation and temporal damage mechanism of hard siltstone. The uniaxial compression tests, coupled with acoustic emission(AE) and infrared radiation temperature(IrT) were conducted on siltstones with different stratification effects. The results revealed that the stratigraphic structure significantly affects the stress-strain response and strength degradation characteristics. The mechanical parameters exhibit anisotropy characteristics, and the stratification effect exhibits a negative correlation with the cracking stress and peak stress. The failure modes caused by the stratification effect show remarkable anisotropic features, including splitting failure(Ⅰ: 0°-2..50°, Ⅱ: 90°), composite failure(45°), and shearing failure(67.50°). The AE temporal sequences demonstrate a stepwise response characteristic to the loading stress level. The AE intensity indicates that the stress sensitivity of shearing failure and composite failure is generally greater than that of splitting failure. The IrT field has spatiotemporal migration and progressive dissimilation with stress loading and its dissimilation degree increases under higher stress levels. The stronger the stratification effect, the greater the dissimilation degree of the IrT field. The abnormal characteristic points of average infrared radiation temperature(AIrT) variance at local stress drop and peak stress can be used as early and late precursors to identify fracture instability. Theoretical analysis shows that the competitive relationship between compaction strengthening and fracturing damage intensifies the dissimilation of the infrared thermal field for an increasing stress level. The present study provides a theoretical reference for disaster warnings in hard sedimentary rock mass.

关键词： Hard siltstone Failure mechanism Stratification effect Infrared radiation characteristic Temporal-damage mechanism Dissimilation

Impacts of proppant distribution on development of tight oil reservoirs with threshold pressure gradient

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petroleum Science 2024年第1期21卷 445-457页

作者： Ming Yue Wei-Yao Zhu Fei-Fei Gou tian-ru Song Yu-chun You Qi-Tao Zhang State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development Beijing102206China School of civil and resource engineering University of Science and Technology BeijingBeijing100083China

Field evidence indicates that proppant distribution and threshold pressure gradient have great impacts on well *** at the development of unconventional oil reservoirs in Triassic Chang-7 Unit,Ordos Basin of china,we presented an integrated workflow to investigate how(1)proppant placement in induced fracture and(2.non-linear flow in reservoir matrix would affect well productivity and fluid flow in the *** with our research before(Yue et al.,2.2.),here we extended this study into the development of multi-stage fractured horizontal wells(MFHWs)with large-scale complicated fracture *** integrated workflow is based on the finite element method and consists of simulation models for proppant-laden fluid flow,fracture flow,and non-linear seepage flow,*** results indicate that the distribution of proppant inside the induced cracks significantly affects the productivity of the *** we assign an idealized proppant distribution instead of the real distribution,there will be an overestimation of 44.98%in daily oil rate and 30.63%in cumulative oil production after continuous development of 1000 ***,threshold pressure gradient(TpG)also significantly affects the well performance in tight oil *** we simply apply linear Darcy’s law to the reservoir matrix,the overall cumulative oil production can be overrated by 77%after 1000 days of *** general,this research provides new insights into the development of tight oil reservoirs with TpG and meanwhile reveals the significance of proppant distribution and non-linear fluid flow in the production scenario design.

关键词： proppant distribution Tight oil reservoir Multi-stage fractured horizontal well Threshold pressure gradient Moving boundary

密度泛函理论在氮还原反应催化剂设计中的应用进展

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Science china Materials 2024年第4期67卷 1101-1123页

作者：代天一杨春成蒋青 Key Laboratory of Automobile Materials Ministry of Educationand School of Materials Science and EngineeringJilin UniversityChangchun 130022China

发展电化学氮气还原反应(Nrr)的合成氨技术可以有效缓解工业上的哈伯-博什法合成氨的化石燃料消耗与碳排放问题.同时,氨是一种无碳的能源载体,Nrr可以实现可再生能源的转换,因此具有广阔的发展前景.然而,高效催化剂的缺乏限制了Nrr技术... 详细信息

发展电化学氮气还原反应(Nrr)的合成氨技术可以有效缓解工业上的哈伯-博什法合成氨的化石燃料消耗与碳排放问题.同时,氨是一种无碳的能源载体,Nrr可以实现可再生能源的转换,因此具有广阔的发展前景.然而,高效催化剂的缺乏限制了Nrr技术的发展.为此,人们对开发高效催化剂进行了广泛的探索,其中密度泛函理论(DFT)计算在辅助催化剂设计方面发挥了重要作用.在本综述中,我们总结了最近的催化剂设计策略,这些策略的目的是提高Nrr的催化活性和选择性.此外,本综述还回顾了具有代表性的计算工作,并对进一步改善催化性能提出了见解.最后,本综述简要讨论了通过DFT计算进行催化剂设计所面临的挑战和机遇.目的在于指导人们采用更有效的设计策略来实现高效的Nrr过程.

关键词：催化剂设计高效催化剂可再生能源能源载体反应催化剂燃料消耗 DFT计算还原反应

Quick image-processing method of UAV without control points data in earthquake disaster area

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中国有色金属学会会刊：英文版 2011年第S3期21卷 523-528页

作者： LI Chang-chun1, ZHANG Guang-sheng1, LEI tian-jie2. 3, GONG A-du2. 3 1. School of Surveying & Land Information {2., Henan polytechnic university, Jiaozuo 454000, china 2. Key Laboratory of Environmental Change and Natural Disaster, Ministry of Education, Beijing Normal university, Beijing 100875, china 3. Ministry of civil Affairs/Ministry of Education of china Academy of Disaster reduction and Emergency Management, Beijing Normal university, Beijing 100875, china [a] School of Surveying & Land Information engineering Henan Polytechnic University Jiaozuo 454000 China [b] Key Laboratory of Environmental Change and Natural Disaster Ministry of Education Beijing Normal University Beijing 100875 China [c] Ministry of civil Affairs/Ministry of Education of china Academy of Disaster reduction and Emergency Management Beijing Normal University Beijing 100875 China

The methods of unmanned aerial vehicles images splicing rapidly and rectifying without control points data, only using auxiliary data recorded by unmanned aerial vehicle (UAV) system, were researched. Two algorithms were proposed, including UAV images auto- splicing rapidly after image blocking and UAV images rectifying based on pseudo center points of auxiliary data. When SIFT algorithm for UAV images splicing is applied, the accuracy is very high, but the efficiency is very low. The splicing efficiency is improved greatly based on SIFT algorithm after image blocking. The results show that rectifying accuracy is very high and has no visual dislocation when pseudo center points of auxiliary data is applied.

关键词： unmanned aerial vehicles SIFT algorithm blocking quickly splicing rectification

Advances in ethnopharmacology,phytochemistry and pharmacology of Erigerontis Herba and its Chinese medicine prescriptions

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Traditional Medicine research 2025年第1期10卷 44-61页

作者： Yang Zhou Yuan-Yan Huang Ding-Yue Shang Ying Chen Meng tian cheng-Yu Jin Xin Lu Bing-{2. Yan Han-Qing pang Institute of Translational Medicine School of MedicineYangzhou UniversityYangzhou 225009China Jiangsu Key Laboratory of Integrated Traditional Chinese and Western Medicine for prevention and Treatment of Senile Diseases Yangzhou UniversityYangzhou 225009China School of Medicine Nanjing University of Chinese MedicineNanjing 210023China State Key Laboratory for Chemistry and Molecular engineering of Medicinal resources Guangxi Normal UniversityGuiling 541004China.

Erigerontis Herba(EH),the dried whole plant of Erigeron breviscapus,is well-known for circulating blood,activating meridians to alleviate pain,expelling wind,and clearing away *** has been extensively utilized in southern china for the treatment of stroke hemiplegia,chest stuffiness and pains,rheumatic arthralgia,headache,and *** review focuses on the botany,ethnopharmacology,phytochemistry,pharmacology and toxicity of EH and its related prescriptions to offer new insights for prospective research of *** information about EH was retrieved from ancient records and books,pubMed,china National Knowledge Infrastructure,Chinese pharmacopoeia,Web of Science,Doctoral and Master’s Theses,and various electronic *** is a member of Compositae family and is mainly grown in southern *** Chinese medicine records that EH has the effects of circulating blood and removing blood stasis,expelling wind,and removing cold,as well as relieving rigidity of muscle and relieving *** now,nearly 2.0 ingredients have been characterized from EH,including flavonoids,caffeoyls,aromatic acids,coumarins,pentacyclic terpenoids,volatile oil and other *** extracts,EH related prescriptions(Dengzhan Xixin injection,Dengzhan Shengmai capsules,etc.)or compounds(scutellarin,scutellarein,etc.)possessed obvious therapeutic effects of ischemic stroke,cerebral hemorrhage,myocardial infarction,Alzheimer’s disease,diabetes and its complications,gastric cancer,bone,and joint degenerative ***,the major active compound of EH,has been used as a quality *** no obvious toxicity of EH has been *** to its traditional applications,ethnopharmacology,phytochemistry,pharmacology,and toxicity,EH was applied as a valuable herb for clinical application in food and medicine *** several compounds have been shown to possess diverse biological activities,the underlying mechanisms of their actions remain *** fully exploi

关键词： Erigeron breviscapus traditional applications ethnopharmacology phytochemistry pharmacology

periods and Energy Dissipations of a Novel TLD rectangular Tank with Angle-adjustable Baffles

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Journal of Shanghai Jiaotong university(Science) 2008年第2期13卷 139-144页

作者：尚春雨赵金城 Department of civil engineering Shanghai Jiaotong University

A novel tuned liquid damper (TLD) rectangular tank with two angle-adjustable baffles was pre- *** numerical analysis was performed using the commercial code *** standard kinetic energy and dissipation rate turbulent model was employed,which was solved using volume of fluid (VOF) method able to treat both the free surface motion and the viscous stresses over the rigid walls *** relationship between the natural periods of water and the angles of its baffles was studied by numerical sim- ulating of a case,and the changes of energy dissipations were *** natural periods and dampers of the novel TLD can be changed in a wide range by adjusting the baffles' angle,thus it is more effective in controlling the vibration of structures in a wide frequency range.

关键词： tuned liquid damper angle-adjustable baffle turbulent eddies energy dissipation

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基于喷雾冷却的发动机排气系统减阻

吉林大学学报（工学版） 2024年第3期54卷 641-649页

作者：张成春辛振涛于海吴玉峰孙潇伟杜天宇吉林大学工程仿生教育部重点实验室长春130022 吉林大学威海仿生研究院山东威海264402 威海市科技创新与发展中心山东威海264200 中国北方车辆研究所北京100086

采用电加热喷雾冷却减阻试验台,系统研究了喷雾流量、喷雾倾角、气流温度、气流速度影响发动机排气系统减阻性能的规律;采用基于离散相模型(DpM)的数值模拟,阐释了喷雾冷却大幅降低排气阻力的原因。研究结果表明:喷雾流量为12.2. mL/s时... 详细信息

采用电加热喷雾冷却减阻试验台,系统研究了喷雾流量、喷雾倾角、气流温度、气流速度影响发动机排气系统减阻性能的规律;采用基于离散相模型(DpM)的数值模拟,阐释了喷雾冷却大幅降低排气阻力的原因。研究结果表明:喷雾流量为12.2. mL/s时,减阻率随喷雾流量的增加而增大;喷雾倾角由45°增加至90°时,减阻率先保持不变后减小,45°和60°喷雾倾角时的减阻效果均为最佳;气流温度为2.0~300℃时,随着气流温度的升高,减阻率呈增大趋势;气流速度由2. m/s增大至30 m/s时,减阻率逐渐下降。排气系统喷雾后阻力大幅度减小的原因是喷雾后气流速度降低,湍流强度降低,局部阻力和摩擦阻力显著减小。

关键词：流体力学排气系统喷雾冷却减阻