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Nanoparticle-reinforced foam system for enhanced oil recovery(EOR):Mechanistic review and perspective

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Petroleum Science 2023年第4期20卷 2282-2304页

作者： Xue-Chen Tang yi-qiang li Zhe-Yu liu Ning Zhang National Key Laboratory of Petroleum Resources and Engineering China University of Petroleum(Beijing)Beijing102249PR China College of Petroleum Engineering China University of Petroleum(Beijing)Beijing102249PR China Tianjin Branch of China National Offshore Oil Corporation limited Tianjin300459PR China

Boosted by economic development and rising living standards,the world's carbon dioxide emissions remain *** temperature rises below 1.5℃ by the end of the century requires rapid global carbon capture and storage *** successful application of carbon capture,utilization,and storage(CCUS)technology in oilfields has become the key to getting rid of this *** flooding,as an organic combination of gas and chemical flooding,became popular in the *** the irreplaceable advantages,as a thermodynamically unstable system,foam's stability has long restricted its development in enhanced oil and gas *** special surface/interface effects and small-size effects,nanoparticles can be used as foam stabilizers to enhance foam stability,thereby improving foam seepage and oil displacement effects in porous *** this paper,the decay kinetics and the stabilization mechanisms of nanoparticle-reinforced foams were systematically *** effects of nanoparticle characteristics,including particle concentration,surface wettability,particle size,and type,and reservoir environment factors,including oil,temperature,pressure,and salinity on the foam stabilization ability were analyzed in *** seepage and flooding mechanisms of nanoparticle-reinforced foams were summarized as:improving the plugging properties of foams,enhancing the interaction between foams and crude oil,and synergistically adjusting the wettability of reservoir ***,the challenges in the practical application of nanoparticle-reinforced foams were highlighted,and the development direction was *** development of nanoparticle-reinforced foam can open the way toward adaptive and evolutive EOR technology,taking one further step towards the high-efficiency production of the petroleum industry.

关键词： Nanoparticle Foam stability Porous media Oil displacement mechanism Enhanced oil recovery

Risk factors for prostatic inflammation extent and infection in benign prostatic hyperplasia

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Asian Journal of Andrology 2006年第5期8卷 621-627页

作者： Fa-Xian yi qiang Wei Hong li Xiang li Ming Shi qiang Dong Yu-Ru Yang Department of Urology West China Hospital West China Medical School Sichuan University Chengdu Sichuan 610041 China

Aim： To investigate the risk factors for prostatic inflammation extent and infection in patients with benign prostatic hyperplasia （BPH） so as to manage prostatic inflammation more efficiently. Methods： Sixty patients with BPH undergoing TURP between September 2005 and December 2005 in West China Hospital of Sichuan University were studied. Prostate fluid （PF） was collected for the measurement of secretory IgA （SIgA） and complement 3 （C3）. Prostate tissue were collected for testing bacterial 16S rDNA by real-time PCR, examining SIgA in the tissue and examining the inflammation. The possible clinical and immune risk factors for prostatic inflammation or infection were analyzed by using the logistic regression method. Results： Abnormal white blood cell count in urinalysis, prostatic infection and a high concentration of C3 in PF are the risk factors for prostatic inflammation extent （P = 0.025, 0.034 and 0.035, respectively and odds ratio [OR] = 18.269, 8.284 and 1.508, respectively）. Risk factors for prostatic infection include the C3 concentration and the concentration of SIgA in PF （P = 0.003 and 0.013, respectively, and OR=1.645 and 0.993, respectively）. Conclusion： The present study suggests that prostatic inflammation is associated with urinary tract infection, prostatic infection and the activated complement and that prostatic infection is associated with the activated complement and downregulated mucosal immunity in prostates of the patients with BPH. It is also suggested that individual immune regulation should be considered in the treatment of prostatic inflammation and infection of patients with BPH.

关键词： inflammation infection logistic regression benign prostatic hyperplasia prostate

A Semiparametric Additive-multiplicative Rates Model for the Weighted Composite Endpoint of Recurrent and Terminal Events

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Acta Mathematica Sinica,English Series 2024年第4期40卷 985-999页

作者： yi DENG qiang XIONG Shu Wei li School of Economics and Statistics Guangzhou UniversityGuangzhou 510006P.R.China

Recurrent event data are commonly encountered in many scientific fields,including biomedical studies,clinical trials and epidemiological surveys,and many statistical methods have been proposed for their *** this paper,we consider to use a weighted composite endpoint of recurrent and terminal events,which is weighted by the severity of each event,to assess the overall effects of covariates on the two types of events.A flexible additive-multiplicative model incorporating both multiplicative and additive effects on the rate function is proposed to analyze such weighted composite event process,and more importantly,the dependence structure among the recurrent and terminal events is left *** the estimation,we construct the unbiased estimating equations by virtue of the inverse probability weighting technique,and the resulting estimators are shown to be consistent and asymptotically normal under some mild regularity *** evaluate the finite-sample performance of the proposed method via simulation studies and apply the proposed method to a set of real data arising from a bladder cancer study.

关键词： Additive-multiplicative rates model estimating equation recurrent events terminal event weighted composite endpoint

Experimental investigation on the enhanced oil recovery efficiency of polymeric surfactant: Matching relationship with core and emulsification ability

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Petroleum Science 2023年第1期20卷 619-635页

作者： Xin Chen yi-qiang li Zhe-Yu liu Japan Trivedi Wen-Bin Gao Ming-Yue Sui State Key Laboratory of Oil and Gas Resources and Exploration School of Petroleum EngineeringChina University of Petroleum(Beijing)Beijing 102249China Faculty of Engineering-Civil and Environmental Engineering University of AlbertaEdmontonAlberta T6G 2R3Canada Institute of Rock and Soil Mechanics Chinese Academic of SciencesWuhanHubei 430071China PetroChina Changqing Oilfield Co Research Institute of Oilfield Exploration and Development XianShaanxi 710018China

The polymeric surfactant can be used as an efficient agent for enhanced oil recovery(EOR)because of its large bulk viscosity and good interfacial ***,there is a sparse understanding of its matching relationship with reservoirs and emulsification occurrence conditions,which may affect its migration and EOR *** intermolecular association molecule polymeric surfactant(IAM)was synthesized by micellar polymerization and characterized with 1 H NMR,FTIR,and *** matching relationship between IAM and reservoirs was evaluated by comparing the viscosity retention rate of effluent in the core flow ***,the effect of the matching relationship on EOR in the heterogeneous reservoir was clarified with parallel core displacement experiments by considering different flow abilities of IAM in the high-permeability *** occurrence conditions of in-situ emulsification of IAM were evaluated via oil-water co-injection experiments under the different injection rates and oil-water *** visualization displacement was carried out to compare the micro EOR mechanisms of different chemical *** results show that IAM features thickening,shearing resistance,viscoelasticity,thermal stability,and interfacial *** matching relationship between cores and IAM could be divided as hardly injected,flow limited,and flow smoothly,corresponding to the viscosity retention ratio of80%,*** could gain better EOR efficiency(17.69%)when its matching relationship to the high permeability layer was“flow limited”.The defined mixture capillary number shows that only when it is greater than 1×10^(3),the in-situ emulsions can be *** to HPAM,IAM could reduce IFT and form vortices to more effectively displace film and corner remaining oils by stripping and peeling off crude *** formed emulsion accumulated at the pore throat could further increase flow resistance,which benefits swept area enlargemen

关键词： Migration Matching relationship Viscosity retention ratio Emulsion EOR

Pore-scale investigation of residual oil displacement in surfactant–polymer flooding using nuclear magnetic resonance experiments

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Petroleum Science 2016年第1期13卷 91-99页

作者： Zhe-Yu liu yi-qiang li Ming-Hui Cui Fu-Yong Wang A.G.Prasiddhianti EOR Research Institute China University of Petroleum

Research on the Gangxi III area in the Dagang Oilfield shows that there was still a significant amount of oil remaining in oil reservoirs after many years of polymer *** is a potential target for enhanced oil recovery（EOR）.Surfactant–polymer（SP） flooding is an effective chemical EOR method for mobilizing residual oil and improving displacement efficiency macroscopically,but the microscopic oil displacement efficiency in pores of different sizes is *** magnetic resonance（NMR） is an efficient method for quantifying oil saturation in the rock matrix and analyzing pore *** this paper,the threshold values of different pore sizes were established from the relationship between mercury injection curves and NMR T2 *** distribution and migration of residual oil in different flooding processes was evaluated by quantitatively analyzing the change of the relaxation *** oil displaced from pores of different sizes after the water flood,polymer flood,and the SP flood was calculated,*** results indicate that（1） the residual oil in medium pores contributed the most to the incremental oil recovery for the SP flood,ranging from 40 % to 49 %,and small pores usually contributed ／30 %;（2） the residual oil after the SP flood was mainly distributed in small and medium pores;the residual oil in medium pores accounted for 47.3 %–54.7 %,while that trapped in small pores was 25.7 %–42.5 %.The residual oil in small and medium pores was the main target for EOR after the SP flood in oilfields.

关键词： flooding pores reservoirs surfactant migration remaining quantitatively rock relaxation sizes

Energy consumption optimization for edge computing-supported cellular networks based on optimal transport theory

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Science China(Information Sciences) 2024年第2期67卷 201-218页

作者： Xiangyu LV Xiaohu GE yi ZHONG qiang li Yong XIAO School of Electronic Information and Communications Huazhong University of Science and Technology

With advancements in mobile communication technologies, there have been multiple user device(UD) connections to cellular networks. Because of changes in the spatial distribution of UDs and application requirements, the traditional offloading mechanism based on the nearest distance will result in heavy loads for some base stations(BSs). Because there is a high-order relationship between the energy consumption of the BS processing tasks and the number of computing tasks, the traditional offloading mechanism will result in high energy consumption, and UD’s offloading decision must be dynamically adjusted. The offloading decision of UDs is optimized based on detailed information about various parameters associated with a network from the standpoint of distribution. This information includes details regarding the spatial distribution of UDs,application requirements, and the offloading period of computing tasks. Based on optimal transport theory,an energy consumption optimization algorithm is suggested to lower the total amount of energy consumed by the offloading process of UDs’ computing tasks by reasonably planning the offloading BSs of the UDs in the networks. The simulation results show that the proposed offloading mechanism based on energy consumption optimization reduces the total energy consumption of the offloading process by 28.09% when compared to the traditional offloading mechanism, and the traffic managed by each BS is balanced.

关键词： optimal transport theory edge computing energy consumption reduction dynamic voltage frequency scaling

Representation learning: serial-autoencoder for personalized recommendation

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Frontiers of Computer Science 2024年第4期18卷 61-72页

作者： yi ZHU yishuai GENG Yun li Jipeng qiang Xindong WU School of Information Engineering Yangzhou UniversityYangzhou 225127China Key Laboratory of Knowledge Engineering with Big Data(Ministry of Education of the People’s Republic of China) Hefei University of TechnologyHefei 230009China School of Computer Science and Information Engineering Hefei University of TechnologyHefei 230009China

Nowadays,the personalized recommendation has become a research hotspot for addressing information *** this,generating effective recommendations from sparse data remains a ***,auxiliary information has been widely used to address data sparsity,but most models using auxiliary information are linear and have limited *** to the advantages of feature extraction and no-label requirements,autoencoder-based methods have become quite ***,most existing autoencoder-based methods discard the reconstruction of auxiliary information,which poses huge challenges for better representation learning and model *** address these problems,we propose Serial-Autoencoder for Personalized Recommendation(SAPR),which aims to reduce the loss of critical information and enhance the learning of feature ***,we first combine the original rating matrix and item attribute features and feed them into the first autoencoder for generating a higher-level representation of the ***,we use a second autoencoder to enhance the reconstruction of the data representation of the prediciton rating *** output rating information is used for recommendation *** experiments on the MovieTweetings and MovieLens datasets have verified the effectiveness of SAPR compared to state-of-the-art models.

关键词： personalized recommendation autoencoder representation learning collaborative filtering

Mechanism investigation of steam flooding heavy oil by comprehensive molecular characterization

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Petroleum Science 2023年第4期20卷 2554-2563页

作者： Bo Zhang Chun-Ming Xu Zhe-Yu liu Qing-Hui Zhao Hai-Qing Cheng yi-qiang li Quan Shi State Key Laboratory of Heavy Oil Processing China University of PetroleumBeijing102249China College of Petroleum Engineering China University of PetroleumBeijing102249China Research Institute of Exploration and Development Liaohe Oilfield CompanyPetroChinaPanjinLiaoning124010China

Steam flooding is a widely used technique to enhance oil recovery of heavy *** viscosity reduction and distillation effect are considered as two main displacement mechanisms in steam flooding ***,the molecular composition understanding and contribution for oil production are still *** this study,the composition analysis of the heavy oil was investigated in the core scale steam flooding process with the temperature from 120 to 280℃.The crude oil,produced oils and residual oils were characterized comprehensively by gas chromatography and high-resolution mass *** is found that steam flooding preferentially extracts aromatics and remains more resins in the residual *** reduction is the dominant mechanism when steam is injected at a low *** molecular heteroatoms with high carbon number and high double bond equivalent(DBE)are eluted into the produced oil,while compounds with low carbon number and low DBE are remained in the residual *** the steam temperature rises,the increased distillation effect results in the extraction of light hydrocarbons from the residual oil to the produced *** small heteroatoms with low carbon number and low DBE enter into the produced oil,especially in the none water cut *** compositional difference of produced oils is characterized in DBE versus carbon number distribution of the N and O containing compound *** work uses a variety of composition analysis methods to clarify the steam flooding mechanism and provides a novel understanding of steam flooding mechanisms with various temperatures and production stages from the molecular perspective.

关键词： Steam flooding mechanism Molecular composition High-resolution mass spectrometry Heavy oil Enhance oil recovery

An anti-icing scaling method for wind tunnel tests of aircraft thermal ice protection system

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Chinese Journal of Aeronautics 2024年第6期37卷 1-6页

作者： Yu liU qiang WANG Xian yi Ningli CHEN Jinghao REN Weihao li Key Laboratory of Icing and Anti/de-icing China Aerodynamics Research and Development CenterMianyang 621000China State Key Laboratory of Aerodynamics Mianyang 621000China

The efficiency of the aircraft Ice Protection Systems(IPSs)needs to be verified through icing wind tunnel ***,the scaling method for testing the IPSs has not been systematically established yet,and further research is *** the present study,a scaling method specifically designed for thermal IPSs was derived from the governing equation of thin water *** scaling parameters were adopted to address the heat and mass transfer involved in the thermal anti-icing *** method validation,icing wind tunnel tests were conducted using a jet engine nacelle model equipped with a bleed air *** non-dimensional surface temperature and runback ice closely matched for both the reference and scaled *** validation confirms that the scaling method is capable of achieving the similarity of surface temperature and the runback ice *** anti-icing scaling method can serve as an important supplement to the existing icing similarity theory.

关键词： Scaling method Ice protection system Water film Anti-icing test Icing wind tunnel