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Investigation on microscopic invasion characteristics and retention mechanism of fracturing fluid in fractured porous media

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Petroleum Science 2022年第4期19卷 1745-1756页

作者： Qi-An Da Chuan-jin yao Xue Zhang Xiao-Pu Wang Xiao-Huan Qu Guang-Lun Lei Key Laboratory of Unconventional Oil&Gas Development(China University of Petroleum(East China)) Ministry of EducationQingdao266580ShandongPeople's Republicof China School of Petroleum Engineering China University of Petroleum(East China)Qingdao266580ShandongPeople's Republic of China Shandong Key Laboratory of Oilfield Chemistry China University of Petroleum(East China)Qingdao266580ShandongPeople's Republic of China

Reservoir damage caused by guar gum fracturing fluid and slick water seriously affects the subsequent oil and gas production. However, the invasion characteristics and retention mechanisms of fracturing fluids in the fracture-matrix zone are still unclear. In this work, a microscopic model reflecting the characteristics of the fracture-matrix zone was designed. Based on the microfluidic experimental method, the process of fracturing fluid invasion, flowback and retention in the fracture-matrix zone was investigated visually and characterized quantitatively. The factors and mechanisms affecting fracturing fluid retention in the fracture-matrix zone were analyzed and clarified. The results indicated that in the invasion process, the frontal swept range of slick water was larger than that of the guar gum fracturing fluid, and the oil displacement efficiency and damage rate were lower than those of the guar gum fracturing fluid under the same invasion pressure. With the increase in invasion pressure, the damage rate of slick water increased from 61.09% to 82.77%, and that of the guar gum fracturing fluid decreased from 93.45% to83.36%. Before subsequent oil production, the invaded fracturing fluid was mainly concentrated in the medium-high permeability area of the fracture-matrix zone. The main resistance of slick water was capillary force, while that of the guar fracturing fluid was mainly viscous resistance. The fracturing fluid retention was most serious in the low permeability region and the region near the end of the *** experimental and numerical simulation results showed that increasing the production pressure difference could improve the velocity field distribution of the fracture-matrix zone, increase the flowback swept range and finally reduce the retention rate of the fracture fluid. The retention mechanisms of slick water in the fracture-matrix zone include emulsion retention and flow field retention, while those of the guar gum fracturing fluid inc

关键词： Microfluidic experiment Reservoir damage Fracturing fluid Fracture-matrix zone Retention mechanism

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H_(2)O_(2) actuated molybdenum oxide nanodots:Multi-enzyme-like activities,leverage of Fenton reaction,and dual-mode sensitive detection of alendronate sodium

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Nano Research 2023年第10期16卷 12106-12115页

作者： Siqi Wang yao jin Wenhui Ai Xiufeng Wang Zhiqing Zhang Ting Zhou Guodong Zhang Fang Wang Department of Chemistry College of Chemistry and Chemical EngineeringChina University of Petroleum(East China)Qingdao 266580China

Unexpected benefits to the catalytic performance of materials often originate from the presence of surface ***,novel Dpenicillamine modified molybdenum oxide nanodots,with abundant oxygen vacancy defects,were fabrication by a mild,simple,and cost-effective ***–visible(UV–Vis)absorption spectra analysis showed that the nanodots had peroxidaselike and catalase-like *** reactive oxygen species were probed by electronic paramagnetic resonance technique and spectroscopic methods,demonstrating that the nanodots also had oxidase-like ***,the peroxidase-like activity of nanodots was synergistically enhanced in the presence of ferrous ions or ferric ***,less than nanomolar levels of ferrous ions were required to display this phenomenon,meaning Fenton reagent acted as *** on this,a sensitive colorimetric and fluorescent dual-mode sensor for alendronate sodium was *** linear ranges for colorimetric and fluorescence analysis were 0.2–2.5 and 0.2–2.0μM,with detection limits of 31.21 and 71.84 nM,*** method has a simple large-scale material preparation process with higher sensitivity and shorter reaction time,which can inspire and enlighten the design of nanozyme sensors.

关键词： nanozyme molybdenum oxide Fenton reaction alendronate sodium multi-enzyme-like activities

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The role and advantage of traditional Chinese medicine in the prevention and treatment of COVID-19

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Journal of Integrative Medicine 2023年第5期21卷 407-412页

作者： Ming Huang yao-yuan Liu Ke Xiong Feng-wen Yang Xin-yao jin Zhao-qi Wang Jun-hua Zhang Bo-li Zhang State Key Laboratory of Component-based Chinese Medicine Tianjin University of Traditional Chinese MedicineTianjin 301617China Department of Cardiology the First Teaching Hospital of Tianjin University of Traditional Chinese MedicineNational Clinical Research Center for Chinese Medicine Acupuncture and MoxibustionTianjin 300193China State Drug Administration Key Laboratory of Evidence-based Evaluation of Traditional Chinese Medicine Tianjin University of Traditional Chinese MedicineTianjin 301600China

The global coronavirus disease 2019(COVID-19)pandemic has had a massive impact on global social and economic development and human *** combining traditional Chinese medicine(TCM)with modern medicine,the Chinese government has protected public health by supporting all phases of COVID-19 prevention and treatment,including community prevention,clinical treatment,control of disease progression,and promotion of *** medicine focuses on viruses,while TCM focuses on differential diagnosis of patterns associated with viral infection of the body and recommends the use of TCM decoctions for differential *** differential diagnosis and treatment approach,with its profoundly empirical nature and holistic view,endows TCM with an accessibility advantage and high application value for dealing with ***,we summarize the advantage of and evidence for TCM use in COVID-19 prevention and treatment to draw attention to the scientific value and accessibility advantage of TCM and to promote the use of TCM in response to public health emergencies.

关键词： COVID-19 Traditional Chinese medicine Prevention and control Therapeutics

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Study on the ignition process of a segmented plasma torch

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Plasma Science and Technology 2017年第7期19卷 63-70页

作者： Xiuquan CAO Deping YU Yong XIANG Chao LI Hui JIANG jin yao College of Manufacturing Science and Engineering Sichuan University Chengdu 610065 People＇s Republic of China

Direct current plasma torches have been applied to generate unique sources of thermal energy in many industrial applications. Nevertheless, the successful ignition of a plasma torch is the key process to generate the unique source （plasma jet）. However, there has been tittle study on the underlying mechanism of this key process. A thorough understanding of the ignition process of a plasma torch will be helpful for optimizing the design of the plasma torch structure and selection of the ignition parameters to prolong the service life of the ignition module. Thus, in this paper, the ignition process of a segmented plasma torch （SPT） is theoretically and experimentally modeled and analyzed. Corresponding electrical models of different stages of the ignition process axe set up and used to derive the electrical parameters, e.g. the variations of the arc voltage and arc current between the cathode and anode. In addition, the experiments with different ignition parameters on a home-made SPT have been conducted. At the same time, the variations of the arc voltage and arc current have been measured, and used to verify the ones derived in theory and to determine the optimal ignition parameters for a particular SPT.

关键词： ignition process segmented plasma torch ignition parameters

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Improving the sulfidation-flotation of fine cuprite by hydrophobic flocculation pretreatment

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International Journal of Minerals,Metallurgy and Materials 2018年第11期25卷 1256-1262页

作者： Qian-yu Sun Wan-zhong Yin Dong Li Ya-feng Fu Ji-wei Xue jin yao College of Resources and Civil Engineering Northeastern University College of Zijin Mining Fuzhou University

Hydrophobic flocculation pretreatment was performed to assess its effect on the recovery of fine cuprite in sulfidation-flotation. The results of the micro-flotation experiment showed that cuprite recovery is related to the particle size, and that an excessive content of fine particles(<18 μm) impacted the recovery of coarse particles. When hydrophobic flocculation pretreatment was used, the recovery of fine cuprite in sulfidation-flotation increased from 60.3% to 86.3% under optimum conditions(pH 9.5; sodium oleate concentration, 2 × 10^(-4) mol×L^(-1); stirring time, 6 min; stirring speed, 1600 r×min^(-1)). The laser particle size analysis and optical microscopy results indicate that hydrophobic flocculation pretreatment effectively reduces the content of fine cuprite, and augments the apparent particle size in the pulp. We performed the Derjaguin–Landau–Verwey–Overbeek(DLVO) theory and extended DLVO theory calculations to further support the interpretation of the results.

关键词： fine cuprite sulfidation-flotation hydrophobic flocculation pretreatment extened DLVO theory calculation

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Enhanced recovery of tight reservoirs after fracturing by natural gas huff-n-puff: Underlying mechanisms and influential factors

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Petroleum Science 2023年第6期20卷 3498-3515页

作者： Chuan-jin yao Ya-Qian Liu Bai-Shuo Liu Zheng-Dong Lei Jia Zhao Lei Li National Key Laboratory of Deep Oil and Gas China University of Petroleum(East China)Qingdao 266580ShandongChina Key Laboratory of Unconventional Oil&Gas Development(China University of Petroleum(East China)) Ministry of EducationQingdao266580ShandongChina School of Petroleum Engineering China University of Petroleum(East China)Qingdao266580ShandongChina Research Institute of Petroleum Exploration&Development PetroChinaBeijing100083China

Tight oil resources are abundant in the *** is very important to strengthen the research on the development theory and technology of tight oil reservoirs for ensuring national energy *** gas huff-n-puff can effectively improve the oil recovery of tight oil ***,the pore-scale oil production characteristics and the mechanisms of natural gas huff-n-puff in matrix-fracture cores are poorly *** influence degree of important factors on oil recovery is not clear and the interactions between factors are rarely *** this paper,the oil production characteristics and mechanisms of natural gas huff-n-puff in tight cores with different fracture lengths were quantitatively analyzed by combining nuclear magnetic resonance(NMR)with numerical simulation *** influencing factors and their interactions were evaluated by the response surface method(RSM).The results show that tight cores mainly consist of medium pores(0.1–1μm)and small pores(0.01–0.1μm).The fracture mainly increases the proportion of macro-pores(1–10μm)and medium *** the natural gas huff-n-puff process,crude oil from macro-pores(1–10μm)and medium pores is mainly developed,and the contribution percentage of crude oil in medium pores to oil recovery is the largest,up to 98.28%.The position of gas–oil contact(GOC)moves deeper as the number of huff-n-puff cycles *** contents of CH_(4) and CO_(2) in the oil phase remain at a high level within the GOC,while between the GOC and the component sweep front,the contents of CH_(4) and CO_(2) in the oil phase decrease with the increase in dimensionless *** gas component sweep volume is increasing with the increase in fracture ***,the injected natural gas mainly extracts C_(3)–C_(10) components from crude *** reduction law of crude oil viscosity is consistent with the migration laws of CH_(4) components along the *** with soaking time and gas diffusion coefficient,the inje

关键词： Natural gas huff-n-puff Matrix-fracture cores Nuclear magnetic resonance(NMR) Numerical simulation Response surface method(RSM)

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Endometriosis of the lung: A case report and review of literature

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World Journal of Clinical Cases 2023年第18期11卷 4326-4333页

作者： jin yao Hong Zheng Hui Nie Cheng-Fang Li Wen Zhang jin-jing Wang Department of Pathology Affiliated Hospital of Zunyi Medical UniversityZunyi 563000Guizhou ProvinceChina

BACKGROUND Lung endometriosis is an extremely rare gynecological *** literature reports suggest that the majority of patients will present with only generic symptoms,such as hemoptysis,pneumothorax,and hemopneumothorax,which often leads to *** date,there are 18 case reports of lung endometriosis that describe the clinical manifestation,imaging changes,treatment,and prognosis of the *** provide further insights into this rare disease,we present a new case report and a brief review of pulmonary *** SUMMARY We report here about a 19-year-old woman who was admitted to the hospital for repeated catamenial hemoptysis over a 3-mo *** tomography(CT)imaging during menstruation revealed patchy high-density shadows,approximately 0.5 cm3 in size,in the right middle lobe of the *** patient’s hemoptysis and changes in the CT scans resolved after *** right middle lobectomy,right lower lung repair,and closed thoracic drainage were *** histopathology confirmed lung *** was no recurrence of symptoms at the 6 mo *** We propose diagnosing lung endometriosis by thoroughly taking reproductive history,clinical details,imaging,and histopathology followed by treatment with surgical resection.

关键词： Lung endometriosis Immunophenotype Differential diagnosis Pathogenesis Case report

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Optical coherence tomography angiography for macular microvessels in ischemic branch retinal vein occlusion treated with conbercept:predictive factors for the prognosis

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International Journal of Ophthalmology(English edition) 2023年第12期16卷 2049-2055页

作者： Li Tang Guang-Li Sun Yue Zhao Ting-Ting Yang jin yao Department of Ophthalmology the Affiliated Eye Hospital of Nanjing Medical UniversityNanjing 210029Jiangsu ProvinceChina

AIM:To evaluate the predicative factors of visual prognosis using optical coherence tomography angiography(OCTA)in ischemic branch retinal vein occlusion(BRVO)patients with macular edema(ME)after anti-vascular endothelial growth factor(VEGF)***:In this retrospective analysis,data from 60 patients(60 eyes)with a definite diagnosis of ischemic BRVO with ME by fundus fluorescein angiography(FFA)were *** eyes with ME according to spectral domain optical coherence tomography(SD-OCT)underwent intravitreal conbercept(IVC)and 3+pro re nata(PRN)*** injection times were *** weeks after injection,fundus laser photocoagulation was performed in the non-perfusion area of the *** patients were followed up once a month for *** bestcorrected visual acuity(BCVA),foveal avascular zone(FAZ),and A-circularity index(AI),at 6mo and the baseline were ***:All patients showed significant improvement in BCVA from 0.82±0.32 to 0.39±0.11 logMAR(P<0.001).The mean central macular thickness(CMT)significantly decreased from 476.22±163.54 to 298.66±109.23μ*** the FAZ area and AI at 6mo were significantly higher than those at the baseline:the FAZ area increased(0.38±0.02 vs 0.39±0.02 mm^(2),P<0.05);the AI increased(1.27±0.02 vs 1.31±0.01,P=0.000).The baseline BCVA showed a significantly positive correlation with the baseline FAZ area,FAZ perimeter(PERIM)and AI,final visual gain(FVG)and injection times,respectively(P<0.001).FVG showed a significantly negative correlation with the FAZ area,PERIM,AI and injection times,but a significantly positive correlation with vessel densities(VDs)300μm area around FAZ(FD-300;P<0.001).Injection times was positively correlated with the baseline FAZ area,and AI,but inversely correlated with the baseline FD-300(P<0.001).However macular ischemia was noted in 5 cases during ***:Using OCTA to observe macular ischemia and quantify parameters can better predict the final visual prognosis of p

关键词： optical coherence tomography angiography branch retinal vein occlusion macular edema foveal avascular zone conbercept

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Study on driver’s braking intention identification based on functional near-infrared spectroscopy

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Journal of Intelligent and Connected Vehicles 2018年第3期1卷 107-113页

作者： Lei Zhu Shuguang Li yaohua Li Min Wang Yanyu Li jin yao School of Manufacturing Science and Engineering Sichuan UniversityChengduChina Department of Neurology Chengdu City First People’s HospitalChengduChina Sichuan University ChengduChina

Purpose–Cooperative driving refers to a notion that intelligent system sharing controlling with human driver and completing driving task *** of the key technologies is that the intelligent system can identify the driver’s driving intention in real time to implement consistent driving *** purpose of this study is to establish a driver intention prediction ***/methodology/approach–The authors used the NIRx device to measure the cerebral cortex activities for identifying the driver’s braking *** experiment was carried out in a virtual reality *** the experiment,the driving simulator recorded the driving data and the functional near-infrared spectroscopy(fNIRS)device recorded the changes in hemoglobin concentration in the cerebral *** the experiment,the driver’s braking intention identification model was established through the principal component analysis and back propagation neural ***–The research results showed that the accuracy of the model established in this paper was 80.39 per ***,the model could identify the driver’s braking intent prior to his braking *** limitations/implications–The limitation of this study was that the experimental environment was ideal and did not consider the surrounding *** the same time,other actions of the driver were not taken into account when establishing the braking intention recognition ***,the verification results obtained in this paper could only reflect the results of a few drivers’identification of braking *** implications–This study can be used as a reference for future research on driving intention through fNIRS,and it also has a positive effect on the research of brain-controlled *** the same time,it has developed new frontiers for intention recognition of cooperative *** implications–This study explores new directions for future brain-controlled driving and ***

关键词： Machine learning fNIRS Cooperative driving Driving intention identification

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Experimental investigation on pyrolysis products and pore structure characteristics of organic-rich shale heated by supercritical carbon dioxide

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Petroleum Science 2024年第4期21卷 2393-2406页

作者： Bai-Shuo Liu Chuan-jin yao Jia-Long Qi Ya-Qian Liu Liang Xu jing-Xuan Hou State Key Laboratory of Deep Oil and Gas China University of Petroleum(East China)Qingdao266580ShandongPR China Key Laboratory of Unconventional Oil&Gas Development(China University of Petroleum(East China)) Ministry of EducationQingdao266580ShandongPR China School of Petroleum Engineering China University of Petroleum(East China)Qingdao266580ShandongPR China

The efficient pyrolysis and conversion of organic matter in organic-rich shale,as well as the effective recovery of pyrolysis shale oil and gas,play a vital role in alleviating energy *** state of carbon dioxide(CO_(2))in the pyrolysis environment of shale reservoirs is the supercritical *** unique supercritical fluid properties not only effectively heat organic matter,displace pyrolysis products and change shale pore structure,but also achieve carbon storage to a certain *** samples were made into powder and three sizes of cores,and nitrogen(N_(2))and supercritical carbon dioxide(ScCO_(2))pyrolysis experiments were performed at different final pyrolysis *** properties and mineral characteristics of the pyrolysis products were studied based on gas chromatography analysis,Xray diffraction tests,and mass spectrometry ***,the pore structure characteristics at different regions of cores before and after pyrolysis were analyzed using N_(2) adsorption tests to clarify the impact of fracturing degree on the pyrolysis *** results indicate that the optimal pyrolysis temperature of Longkou shale is about 430℃.Compared with N_(2),the oil yield of ScCO_(2) pyrolysis is *** pyrolysis oil obtained by ScCO_(2) extraction has more intermediate fractions and higher relative molecular *** ScCO_(2) can effectively improve the pore diameter of shale and its effect is better than that of N_(2).The micropores are produced in shale after pyrolysis,and the macropores only are generated in ScCO_(2) pyrolysis environments with temperatures greater than 430℃.The pore structure has different development characteristics at different pyrolysis temperatures,which are mainly affected by the pressure holding of volatile matter and products *** to the surface of the core,the pore development effect inside the core is *** the decrease in core size,the pore diameter,specific surface area,and pore volume of cor

关键词： Organic-rich shale Supercritical carbon dioxide In-situ pyrolysis Pore structure Core size and region

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