Article
Energy & Fuels
Davood Zivar, Peyman Pourafshary, Nikoo Moradpour
Summary: The study demonstrates that the low salinity surfactant (LSS) flooding method outperforms low salinity water (LSW) or surfactant flooding (SF) in reducing residual oil saturation (ROS). Experimental data shows a significant difference in ROS between LSS and SF within different ranges of capillary numbers.
JOURNAL OF PETROLEUM EXPLORATION AND PRODUCTION TECHNOLOGY
(2021)
Review
Engineering, Chemical
Hu Guo, Kaoping Song, R. Hilfer
Summary: Capillary number, as the ratio of viscous force to capillary force, is an important parameter in enhanced oil recovery (EOR). However, the nature and quantification of macroscopic capillary forces are still controversial. At least 41 different capillary numbers have been collected, indicating potential inconsistencies between various applications and publications.
TRANSPORT IN POROUS MEDIA
(2022)
Article
Energy & Fuels
Zhaobo Sun, Yingxian Liu, Hui Cai, Yue Gao, Ruizhong Jiang
Summary: The results of core displacement experiments indicate that increasing water drive velocity can reduce residual oil saturation and improve oil displacement efficiency. However, current commercial simulators cannot simulate the effect of water velocity on the relative permeability curve. This article proposes a new Boltzmann equation to match the nonlinear relationship between capillary number and residual oil and establishes a new reservoir numerical simulator to capture the dynamic variation of residual oil saturation with water drive velocity.
FRONTIERS IN ENERGY RESEARCH
(2023)
Article
Engineering, Chemical
T. R. Zakirov, M. G. Khramchenkov
Summary: This paper presents a systematic study of the dynamic adsorption of a water-soluble surfactant during flooding of oil-saturated porous media. The study reveals the effect of wetting angle, interfacial tension, flow rate, and adsorption rate constant on the adsorbed amount. Lattice Boltzmann simulations are used to study this problem and the obtained tendencies are validated by performing a series of simulations on a group of porous structures.
CHEMICAL ENGINEERING RESEARCH & DESIGN
(2023)
Article
Energy & Fuels
Mariam Shakeel, Aida Samanova, Peyman Pourafshary, Muhammad Rehan Hashmet
Summary: Several studies have demonstrated the synergetic benefits of combining various chemical enhanced oil recovery (CEOR) methods with engineered waterflooding (EWF) in sandstones and carbonate formations. The hybrid EW-CEOR methods showed higher capillary desaturation tendency compared to conventional methods, with the EW-polymer flooding approach significantly reducing residual oil saturation. The results suggest that these hybrid techniques can be effectively implemented in carbonate formations with harsh reservoir conditions.
Article
Energy & Fuels
Rui Song, Yu Tang, Yao Wang, Ruiyang Xie, Jianjun Liu
Summary: A phase-field method was used to simulate two-phase flow, investigating the impact of various parameters on fluid flow characteristics during CO2 flooding for enhanced oil recovery and subsurface CO2 sequestration. Results showed that a stable displacement process occurred when capillary number and viscosity ratio reached certain values. CO2 saturation increased with injected PV value. Different fluid behaviors were observed during wettability alternation. Flooding process was mainly controlled by capillary force and gravity at low capillary numbers. Interfacial tension and permeability affected displaced phase recovery. In the mixed-wet model, increasing nonoil-wetted grains led to higher oil recovery.
Article
Mathematics, Applied
Ruijuan Gu, Hui Lei, Yulai Ma, Zhenyu Taoqiu
Summary: This paragraph discusses the concept of weighted orientation in a graph, defining semi-proper orientation and its number. It also mentions the inspiration for generalizing problems from proper orientation to semi-proper orientation, along with a focus on studying the (semi-)proper orientation number of triangulated planar graphs.
APPLIED MATHEMATICS AND COMPUTATION
(2021)
Article
Energy & Fuels
Mariam Shakeel, Aida Samanova, Peyman Pourafshary, Muhammad Rehan Hashmet
Summary: The study investigated hybrid approaches using engineered water (EW) and chemical enhanced oil recovery (CEOR) for carbonate reservoirs. The best combination was found to be the EWASP flooding in slug-wise injection mode, resulting in 36% incremental oil recovery. Hybrid designs were more effective in recovering residual oil due to better mobility control and lower interfacial tension.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2021)
Article
Chemistry, Physical
Huiyu Wang, Bei Wei, Jian Hou, Yongsheng Liu, Qingjun Du
Summary: This study used microfluidics to observe the fluid flow phenomenon in blind-ends and analyzed the oil displacement mechanism in blind-ends. The results showed that the width of blind-ends affected the displacement efficiency, and heavy oil was more difficult to displace. Polymer flooding and surfactant reduced capillary force and improved the displacement of light oil.
JOURNAL OF MOLECULAR LIQUIDS
(2022)
Article
Chemistry, Analytical
Mostafa A. Atia, Petr Smejkal, Vipul Gupta, Paul R. Haddad, Michael C. Breadmore
Summary: This study demonstrates the superior performance of chemical vapour deposition (CVD) coating for suppressing the electroosmotic flow (EOF) compared to liquid phase deposition (LPD) in capillary electrophoresis (CE). By adjusting the modification method and surface chemistry, the capillary can be easily and effectively modified, and the stability of the coating meets the long-term monitoring requirements for water chemistry.
ANALYTICA CHIMICA ACTA
(2023)
Article
Mathematics, Applied
Yingbin Ma, Xiaoxue Zhang
Summary: Lumduanhom et al. determined all graphs of size m with PC-number or SPC-number m - 1 , m - 2 , m - 3 in 2016. However, the graphs with SPC-number m - 3 were not completely characterized. This article characterizes all graphs with SPC-number m - 3 and presents all graphs satisfying PC-number or SPC-number m - 4.
APPLIED MATHEMATICS AND COMPUTATION
(2023)
Review
Chemistry, Multidisciplinary
Akram Al-Asadi, Eva Rodil, Ana Soto
Summary: The use of nanofluids as an enhanced oil recovery method is showing promise. This new study aims to collect information about the most promising nano-EOR methods according to their performance in core-flooding tests and provides useful information for researchers interested in experimental application of nano-EOR methods. The use of simple nanoparticles in water or brine formulations has shown additional oil recoveries up to 15% of the original oil in place, with even higher recoveries when combined with smart water or magnetic fields. However, practical applications need to consider the cost, difficulty of preparation, and stability of the formulations, and experimental limitations may offer misleading results.
Article
Energy & Fuels
Jungin Lee, Jingjing Huang, Tayfun Babadagli
Summary: Observations show that viscous fingering morphologies during emulsion displacements follow similar development patterns as partially-miscible viscous fingering behavior. Quantitative analysis of empirical data demonstrates a relationship between finger droplet formation morphology and emulsion hydrodynamic instability behavior. Key parameters responsible for droplet formation and their connection to fractal dimension and hydrodynamic stability are mapped in a phase diagram with original experimental images.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2022)
Article
Public, Environmental & Occupational Health
Xiujuan Tang, Salihu S. Musa, Shi Zhao, Shujiang Mei, Daihai He
Summary: In SEIR epidemic models, the mean generation interval (GI) for COVID-19 is reported to be as short as 5 days, but discrepancies in parameter values lead to different results. Using suitable epidemiological parameter values is crucial for proper estimation and prediction. Assessment of COVID-19 transmission dynamics in Belgium, Israel, and the UAE revealed that Belgium has the highest infection attack rate.
FRONTIERS IN PUBLIC HEALTH
(2021)
Review
Energy & Fuels
Afeez Gbadamosi, Shirish Patil, Dhafer Al Shehri, Muhammad Shahzad Kamal, S. M. Shakil Hussain, Emad W. Al-Shalabi, Anas Mohammed Hassan
Summary: This article reviews the combination of low salinity waterflooding (LSWF) and chemical enhanced oil recovery (EOR) for improving oil production in reservoirs. Experimental and modeling results show that the combination of LSWF and chemical EOR is more efficient than individual EOR methods.
Article
Mathematics, Interdisciplinary Applications
Fuyong Wang, Jiong Fu
Summary: This paper proposes a fractal model for predicting the ALP of shale with dual wettability, considering the nonflowing boundary layer effect of water in inorganic pores and the slip effect in organic pores. The research results show that the nonflowing boundary layer can reduce the ALP of inorganic pores, but slip effect will increase the ALP of organic pores.
FRACTALS-COMPLEX GEOMETRY PATTERNS AND SCALING IN NATURE AND SOCIETY
(2021)
Article
Engineering, Chemical
Hui Cheng, Fuyong Wang
Summary: This study proposed the implicit analytical solution of spontaneous water imbibition into a single oil-saturated fracture for the first time, showing that the difference in imbibition velocity with and without gravity increases with the increase in fracture aperture, and there is a critical fracture length for spontaneous imbibition in the single oil-saturated fracture.
CHEMICAL ENGINEERING SCIENCE
(2021)
Article
Energy & Fuels
Fuyong Wang, Fanchao Zeng, Lu Wang, Xianmu Hou, Hui Cheng, Jian Gao
Summary: This study analyzed the fractal characteristics of pore spaces in tight sandstones from the Ordos Basin in China, using NMR and RCP techniques. It showed that the fractal dimensions of pore spaces with movable fluids were negatively correlated with permeability and reservoir quality index, with fractal dimensions approaching 3 indicating less favorable petrophysical properties. Different fractal models were compared for calculating fractal dimensions, with the 3D capillary model found to be the most accurate for evaluating tight sandstone properties.
Article
Energy & Fuels
Hongwei Yu, Hui Cheng, Fuyong Wang, Daiyu Zhou, Liming Lian, Gengping Yan
Summary: Gas flooding is a promising method for enhancing oil recovery in unconventional reservoirs, with difficulty in accurately identifying the distributions of movable and residual oil. This study monitored the oil distributions using low-field NMR and proposed a mathematical model to predict the lower limit of the pore throat size of movable oil during gas flooding. Results showed the model predictions were close to experimental results, providing insights for characterizing residual oil distribution after gas flooding in unconventional reservoirs.
Article
Engineering, Chemical
Fuyong Wang, Jiuyu Zhao
Summary: A new mathematical model considering gravity and buoyancy effects during oil imbibition process is established, showing that oil buoyancy can accelerate the imbibition rate. The differences in imbibition rates with and without gravity and buoyancy become more significant with increasing core permeability and decreasing IFT. In low-IFT solutions, the critical inverse Bond number for considering gravity and buoyancy is approximately 1 x 10(-2).
Article
Chemistry, Multidisciplinary
Fuyong Wang, Hui Cheng, Kaoping Song
Summary: The research shows that surfactant adsorption can increase the product of interfacial tension and the cosine of the contact angle, and the increased capillary pressure in pores leads to a faster imbibition rate. In unconventional oil reservoirs, surfactants with high adsorption and desorption rates on the water-solid interface and diffusion ability will lead to higher oil production rates.
Article
Materials Science, Multidisciplinary
Fuyong Wang, Yun Zai
Summary: This paper characterizes the pore structure of shales using high-pressure mercury intrusion (HPMI) test, fractal theory, and multifractal theory, revealing that fractal dimension can be a key index for evaluating the complexity of shale nanopores. Additionally, the multifractal parameters provide insights into the size, concentration, and asymmetry of pore size distribution in shale nanopores.
RESULTS IN PHYSICS
(2021)
Article
Energy & Fuels
Jiuyu Zhao, Fuyong Wang, Jianchao Cai
Summary: Research shows that the method based on deep convolutional generative adversarial network (DCGAN) can accurately reconstruct the 3D digital rock model of tight sandstones, which is consistent with the characteristics of natural tight sandstones. Furthermore, by training with multiple 3D tight sandstone CT images, the DCGAN can learn the pore structure features of the entire tight sandstone bodies.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2021)
Article
Energy & Fuels
Yukun Chen, Dongming Zhi, Jianhua Qin, Ping Song, Hui Zhao, Fuyong Wang
Summary: This study investigates the methods for enhancing shale oil recovery rates in the Jimsar sag, Junggar Basin, NW China. The results show that CO2 huff and puff method and surfactant imbibition method have a positive effect on improving oil recovery, while fracturing liquid imbibition method without surfactant performs poorly. Surfactants can enhance spontaneous imbibition oil recovery by approximately 18% more in the type II and III shale formations.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2022)
Article
Energy & Fuels
Fuyong Wang, Lu Wang
Summary: The pore structure characteristics and formation permeability of shale oil in the Lucaogou Formation were studied using high-pressure mercury injection, nuclear magnetic resonance, and fractal theory. The results showed that the capillary bundle model was the best for evaluating the fractal characteristics of pore structures. The fractal dimension from NMR data had poor correlation with core petrophysical parameters. The permeability prediction using the Swanson model was the most accurate.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2022)
Article
Engineering, Chemical
Fuyong Wang, Jiong Fu
Summary: This study proposes a model based on the capillary tube model to describe the imbibition in a dual-wettability shale oil reservoir, considering the slip effect in organic nanopores and the boundary-layer effect in inorganic nanopores. The analytical expressions for the imbibition front location in oil-wet organic nanopores and water-wet inorganic nanopores are derived. This research is of great importance for a better understanding of the imbibition mechanism in shale oil reservoirs.
CANADIAN JOURNAL OF CHEMICAL ENGINEERING
(2023)
Review
Energy & Fuels
Yilin Wang, Zhuoping Wu, Fuyong Wang
Summary: With the development of unconventional oil and gas resources, downhole environmental monitoring and data-analysis technologies are becoming increasingly important. Distributed fiber optic measurement technology, as a new monitoring technology, has a wide range of applications in hydraulic fracturing and production monitoring, providing strong technical support for the development of unconventional oil and gas resources.
Article
Water Resources
Fuyong Wang, Yun Zai
Summary: This paper presents a workflow for assessing digital rock petrophysical properties based on machine learning techniques, including automatic segmentation of sandstone rock images, permeability prediction, and flow simulation. The results show that this method is effective in evaluating the physical properties of digital rocks.
ADVANCES IN WATER RESOURCES
(2023)
Article
Mechanics
Fuyong Wang, Zhichao Liu, Hui Yue
Summary: Measuring the relative permeability in tight rock is challenging due to its ultralow permeability and time-consuming experiments. This study used nuclear magnetic resonance (NMR) to investigate the distribution of movable and unmovable water in tight sandstone. Based on the movable fluid distribution, a new method for predicting gas-water relative permeability in tight rock was established. The results showed that the distribution of fluids was influenced by the tight rock's pore size and structure. The proposed mathematical model for predicting gas-water relative permeability was verified by comparing with experimental data.
Article
Energy & Fuels
Kun Yang, Fu-Yong Wang, Jiu-Yu Zhao
Summary: Based on high-pressure mercury injection and nuclear magnetic resonance experiments, this study describes the pore distribution of tight sandstone. The influence of fractures, core porosity and permeability, and surfactants on the spontaneous imbibition of tight sandstone is investigated. The findings show that fractures can effectively reduce oil drop adsorption on the core surface, increasing the imbibition recovery rate. Enhanced pore connectivity, higher core porosity and permeability, and the use of surfactants contribute to improved imbibition recovery of tight oil reservoirs.