Article
Materials Science, Multidisciplinary
Guolong Jin, Haoqing Xu, Aizhao Zhou, Pengming Jiang
Summary: The study found that the porosity of soil-bentonite mixtures is affected by the bentonite content, with a critical bentonite content where the porosity is the lowest; as the bentonite content increases, the bound water percentage of the mixtures also increases.
Article
Thermodynamics
Jianguang Wei, Shuang Liang, Dong Zhang, Jiangtao Li, Runnan Zhou
Summary: This paper conducts experimental research on water flooding efficiency and carries out theoretical comparative analysis on low-permeability and tight oil reservoirs. The innovations mainly include: (a) experimental study on water drive efficiency and analysis of dynamic evolution characteristics of remaining oil distribution, (b) comparative analysis of water drive efficiency under different conditions, and (c) exploration of the dynamic evolution mechanism of bound water -semi-bound water -free water. The results show that free microscale residual oil is the majority at the original oil bearing stage, water flooding mainly develops free residual oil, and it is difficult to develop bound and semi-bound residual oil in water drive.
Article
Thermodynamics
Tong Zhang, Ming Tang, Yankun Ma, Guangpei Zhu, Qinghe Zhang, Jun Wu, Zhizheng Xie
Summary: The investigation of CO2/water flooding mechanism in ultralow-permeability oil reservoir is crucial for enhanced oil recovery. The study conducted core flooding experiments under different in situ stresses and used online LF-NMR technology to monitor multiphase flow and pore-fracture behavior. The findings showed that percolation pore dominated volumetric sweep efficiency, capillary pressure influenced oil recovery in adsorption pore, and viscosity fingering and thief channeling occurred in migration pore. CO2 flooding mainly relied on percolation pore and migration pore for oil recovery, while water flooding saw contributions from all pores. The research also observed decreased oil recovery in pore core with increased in situ stress during CO2/water flooding. The fracture and fracture-connected pore were displaced first in CO2 flooding, and the evolving residual oil showed increased fractal dimension with higher in situ stress in both CO2 and water flooding. The oil recovery rate in CO2 flooding was about 10 times that in water flooding. The peak oil recovery occurred at 25 MPa in CO2/water flooding, and the influence of fractures was more significant in water flooding. These findings provide valuable guidance for enhanced oil recovery in ultralow-permeability reservoirs.
Article
Energy & Fuels
Xing Huang, Yu Zhang, Mengqing He, Xiang Li, Weipeng Yang, Jun Lu
Summary: This study investigates the characteristics of asphaltene precipitation under different CO2 flooding conditions and evaluates the damage degree and impact on oil displacement efficiency in different types of reservoirs. The results show that asphaltene precipitation has high damage on permeability but little effect on porosity. Additionally, the use of surfactants can reduce the wettability reversal caused by asphaltene precipitation.
Article
Energy & Fuels
Mingyu Cai, Yuliang Su, Shiyuan Zhan, Derek Elsworth, Lei Li
Summary: This study proposes a relative permeability model that incorporates complex interactions between fluids and solids in reservoirs. The model predicts the relative permeability to CO2 flooding in the near-miscible region using Gibbs free energy interpolation. The thermodynamic phase behavior of fluids in nanopores is considered by applying critical shifts in temperatures and pressures. The model can be integrated with a compositional simulator to address macroscopic problems in unconventional reservoirs.
Article
Energy & Fuels
Jianguang Wei, Jiumu Zhou, Jiangtao Li, Xiaofeng Zhou, Wennan Dong, Ziyue Cheng
Summary: In this study, five enhancing oil recovery methods were evaluated through core-injection experiments, with surfactant alternating CO2 flooding (SAC) found to be the most effective in improving oil recovery and reducing water cut. The results suggest that SAC combines the advantages of gas and water, recovering oil from both smaller and larger pores in a higher proportion.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2021)
Article
Energy & Fuels
Yuxia Wang, Qinghua Shang, Lifa Zhou, Zunsheng Jiao
Summary: The study found that macroscopic permeability heterogeneity in tight sandstone reservoirs can impact the efficiency of CO2-EOR technology, while a high-low permeability model can improve CO2 injectivity, maintain high pressure levels, and increase oil displacement efficiency.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2021)
Article
Mechanics
Hongwei Zhang, Do Yoon Moh, Shihao Wang, Rui Qiao
Summary: This study investigates the diffusio-osmosis of oil-CO2 mixture in silica and calcite nanopores using molecular dynamics simulations. The results show that, although CO2 enrichment is higher near calcite walls, the diffusio-osmosis in calcite pores is only marginally stronger. This is attributed to the different molecular structures and hydrodynamic properties of the interfacial fluids in the two pores caused by CO2 adsorption on their walls.
Article
Energy & Fuels
Yue Sun, Yunbo Dong, Zhixuan Zhu, Lin Li, Caili Dai, Yining Wu, Mingwei Zhao
Summary: This study synthesized active carbon dots (S-CDs) through two-step hydrothermal reactions and demonstrated their potential in reducing injection pressure and improving oil recovery in unconventional reservoirs. The S-CDs were found to possess excellent aqueous dispersibility and resistance to high temperature and salinity, and exhibited effective control over interfacial tension, viscoelastic modulus, wettability alteration, and adsorption capacity. Core flooding tests showed significant reduction in injection pressure and increase in oil recovery rate with 0.05 wt% S-CD nanofluids compared to simulated formation water.
Article
Energy & Fuels
Yue Sun, Yunbo Dong, Zhixuan Zhu, Lin Li, Caili Dai, Yining Wu, Mingwei Zhao
Summary: Carbon-based nanoparticles, known as active carbon dots (S-CDs), were synthesized in this study for their potential in enhancing oil recovery by improving oil-water interfacial activity. The S-CDs exhibited excellent oil-water and oil-solid interfacial activity by controlling interfacial tension, viscoelastic modulus, wettability alteration, and adsorption capacity. Core flooding tests showed a significant reduction in injection pressure and an increase in oil recovery rate when using 0.05 wt% S-CD nanofluids compared to simulated formation water.
Article
Chemistry, Multidisciplinary
Jiaping Tao, Siwei Meng, Dongxu Li, Gang Cao, Yang Gao, He Liu
Summary: This paper conducted systematic experiments to clarify the interaction between CO2 and shale in different lithofacies and draw relevant conclusions. The results showed that the effects of CO2 treatment on porosity and permeability varied depending on the lithofacies. For foliaceous shale, CO2 treatment had both improving and damaging effects on porosity and permeability, while for laminated shale, both porosity and permeability improved significantly. Therefore, it is necessary to identify the main lithofacies of the target formation before applying CO2 technology in shale oil reservoirs.
APPLIED SCIENCES-BASEL
(2022)
Article
Energy & Fuels
Mohammad Zeyghami, Mohammad Taghizadeh Sarvestani
Summary: The main objective of net pay determination is to exclude non-reservoir intervals so that better results are obtained in reservoir characterization, hydrocarbon in-place calculations, and dynamic flow simulation. This study presents different methods for net pay determination, their strengths, limitations, and input data, along with a new procedure. The proposed methodology considers both rock and fluid properties and validates the results.
JOURNAL OF PETROLEUM EXPLORATION AND PRODUCTION TECHNOLOGY
(2023)
Review
Biotechnology & Applied Microbiology
Sugandha Mahajan, Harender Yadav, Sandeep Rellegadla, Akhil Agrawal
Summary: As the demand for crude oil production increases, the use of EOR technology to recover residual oil from oil fields becomes a primary solution. Currently, polymer flooding technology is widely used, but synthetic polymers show lower stability under extreme reservoir conditions and natural polymers are prone to microbial degradation.
APPLIED MICROBIOLOGY AND BIOTECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
Cailin Wang, Xiusai Xu, Cuiwei Liu, Xiaoming Luo, Qihui Hu, Rui Zhang, Hongda Guo, Xia Luo, Yong Hua, Yuxing Li
Summary: A mechanistic model for general CO2 corrosion of carbon steel with protective iron carbonate (FeCO3) scales in a specific temperature and CO2 partial pressure range was developed. The model incorporated mathematical distributions of the thickness and porosity of FeCO3 scales determined by X-ray micro-computed tomography (μCT). The flux profiles of species under the measured scale thickness and porosity were demonstrated, and the coupling effects of thickness and porosity on the protectiveness of the corrosion product scales were analyzed.
Article
Geosciences, Multidisciplinary
Jinghuai Gao, Weimin Han, Yanbin He, Haixia Zhao, Hui Li, Yijie Zhang, Zongben Xu
Summary: This paper focuses on deriving wave equations in tight oil/gas media, which have a simpler form and can be used for parameter inversion. The derived equations are validated by numerical results and further investigation on the reflection and transmission properties of tight interlayers is conducted.
SCIENCE CHINA-EARTH SCIENCES
(2021)
Article
Energy & Fuels
Yingna Du, Chen Huang, Wei Jiang, Qiangwei Yan, Yongfei Li, Gang Chen
Summary: In this study, anionic surfactants modified hydrotalcite was used as a flow improver for crude oil under low-temperature conditions. The modified hydrotalcite showed a significant viscosity reduction effect on crude oil. The mechanism of the modified hydrotalcite on viscosity and pour point of crude oil was explored through characterization and analysis of the modified hydrotalcite and oil samples.
Article
Energy & Fuels
Mohammad Saeid Rostami, Mohammad Mehdi Khodaei
Summary: In this study, a hybrid structure, MIL-53(Al)@MWCNT, was synthesized by combining MIL-53(Al) particles and -COOH functionalized multi-walled carbon nanotube (MWCNT). The hybrid structure was then embedded in a polyethersulfone (PES) polymer matrix to prepare a mixed matrix membrane (MMM) for CO2/CH4 and CO2/N2 separation. The addition of MWCNTs prevented MIL-53(Al) aggregation, improved membrane mechanical properties, and enhanced gas separation efficiency.
Article
Energy & Fuels
Yunlong Li, Desheng Huang, Xiaomeng Dong, Daoyong Yang
Summary: This study develops theoretical and experimental techniques to determine the phase behavior and physical properties of DME/flue gas/water/heavy oil systems. Eight constant composition expansion (CCE) tests are conducted to obtain new experimental data. A thermodynamic model is used to accurately predict saturation pressure and swelling factors, as well as the phase boundaries of N2/heavy oil systems and DME/CO2/heavy oil systems, with high accuracy.
Article
Energy & Fuels
Morteza Afkhamipour, Ebad Seifi, Arash Esmaeili, Mohammad Shamsi, Tohid N. Borhani
Summary: Non-conventional amines are being researched worldwide to overcome the limitations of traditional amines like MEA and MDEA. Adequate process and thermodynamic models are crucial for understanding the applicability and performance of these amines in CO2 absorption, but studies on process modeling for these amines are limited. This study used rate-based modeling and Deshmukh-Mather method to model CO2 absorption by DETA solution in a packed column, validated the model with experimental data, and conducted a sensitivity analysis of mass transfer correlations. The study also compared the CO2 absorption efficiency of DETA solution with an ionic solvent [bmim]-[PF6] and highlighted the importance of finding optimum operational parameters for maximum absorption efficiency.
Article
Energy & Fuels
Arastoo Abdi, Mohamad Awarke, M. Reza Malayeri, Masoud Riazi
Summary: The utilization of smart water in EOR operations has gained attention, but more research is needed to understand the complex mechanisms involved. This study investigated the interfacial tension between smart water and crude oil, considering factors such as salt, pH, asphaltene type, and aged smart water. The results revealed that the hydration of ions in smart water plays a key role in its efficacy, with acidic and basic asphaltene acting as intrinsic surfactants. The pH also influenced the interfacial tension, and the aged smart water's interaction with crude oil depended on asphaltene type, salt, and salinity.
Article
Energy & Fuels
Dongao Zhu, Kun Zhu, Lixian Xu, Haiyan Huang, Jing He, Wenshuai Zhu, Huaming Li, Wei Jiang
Summary: In this study, cobalt-based metal-organic frameworks (Co-based MOFs) were used as supports and co-catalysts to confine the NHPI catalyst, solving the leaching issue. The NHPI@Co-MOF with carboxyl groups exhibited stronger acidity and facilitated the generation of active oxygen radicals O2•, resulting in enhanced catalytic activity. This research provides valuable insights into the selection of suitable organic linkers and broadens the research horizon of MOF hybrids in efficient oxidative desulfurization (ODS) applications.
Article
Energy & Fuels
Edwin G. Hoyos, Gloria Amo-Duodu, U. Gulsum Kiral, Laura Vargas-Estrada, Raquel Lebrero, Rail Munoz
Summary: This study investigated the impact of carbon-coated zero-valent nanoparticle concentration on photosynthetic biogas upgrading. The addition of nanoparticles significantly increased microalgae productivity and enhanced nitrogen and phosphorus assimilation. The presence of nanoparticles also improved the quality of biomethane produced.
Article
Energy & Fuels
Yao Xiao, Asma Leghari, Linfeng Liu, Fangchao Yu, Ming Gao, Lu Ding, Yu Yang, Xueli Chen, Xiaoyu Yan, Fuchen Wang
Summary: Iron is added as a flocculant in wastewater treatment and the hydrothermal carbonization (HTC) of sludge produces wastewater containing Fe. This study investigates the effect of aqueous phase (AP) recycling on hydrochar properties, iron evolution and environmental assessment during HTC of sludge. The results show that AP recycling process improves the dewatering performance of hydrochar and facilitates the recovery of Fe from the liquid phase.
Article
Energy & Fuels
He Liang, Tao Wang, Zhenmin Luo, Jianliang Yu, Weizhai Yi, Fangming Cheng, Jingyu Zhao, Xingqing Yan, Jun Deng, Jihao Shi
Summary: This study investigated the influence of inhibitors (carbon dioxide, nitrogen, and heptafluoropropane) on the lower flammability limit of hydrogen and determined the critical inhibitory concentration needed for complete suppression. The impact of inhibitors on explosive characteristics was evaluated, and the inhibitory mechanism was analyzed with chemical kinetics. The results showed that with the increase of inhibitor quantity, the lower flammability limit of hydrogen also increased. The research findings can contribute to the safe utilization of hydrogen energy.
Article
Energy & Fuels
Zonghui Liu, Zhongze Zhang, Yali Zhou, Ziling Wang, Mingyang Du, Zhe Wen, Bing Yan, Qingxiang Ma, Na Liu, Bing Xue
Summary: In this study, high-performance solid catalysts based on phosphotungstic acid (HPW) supported on Zr-SBA-15 were synthesized and evaluated for the one-pot conversion of furfural (FUR) to γ-valerolactone (GVL). The catalysts were characterized using various techniques, and the ratio of HPW and Zr was found to significantly affect the selectivity of GVL. The HPW/Zr-SBA-15 (2-4-15) catalyst exhibited the highest GVL yield (83%) under optimized reaction conditions, and it was determined that a balance between Bronsted acid sites (BAS) and Lewis acid sites (LAS) was crucial for achieving higher catalytic performance. The reaction parameters and catalyst stability were also investigated.
Article
Energy & Fuels
Michael Stoehr, Stephan Ruoff, Bastian Rauch, Wolfgang Meier, Patrick Le Clercq
Summary: As part of the global energy transition, an experimental study was conducted to understand the effects of different fuel properties on droplet vaporization for various conventional and alternative fuels. The study utilized a flow channel to measure the evolution of droplet diameters over time and distance. The results revealed the temperature-dependent effects of physical properties, such as boiling point, liquid density, and enthalpy of vaporization, and showed the complex interactions of preferential vaporization and temperature-dependent influences of physical properties for multi-component fuels.
Article
Energy & Fuels
Yuan Zhuang, Ruikang Wu, Xinyan Wang, Rui Zhai, Changyong Gao
Summary: Through experimental validation and optimization of the chemical kinetic model, it was found that methanol can accelerate the oxidation reaction of ammonia, and methanol can be rapidly oxidized at high concentration. HO2 was found to generate a significant amount of OH radicals, facilitating the oxidation of methanol and ammonia. Rating: 7.5/10.
Article
Energy & Fuels
Radwan M. EL-Zohairy, Ahmed S. Attia, A. S. Huzayyin, Ahmed I. EL-Seesy
Summary: This paper presents a lab-scale experimental study on the impact of diethyl ether (DEE) as an additive to waste cooking oil biodiesel with Jet A-1 on combustion and emission features of a swirl-stabilized premixed flame. The addition of DEE to biodiesel significantly affects the flame temperature distribution and emissions. The W20D20 blend of DEE, biodiesel, and Jet A-1 shows similar flame temperature distribution to Jet A-1 and significantly reduces UHC, CO, and NOx emissions compared to Jet A-1.
Article
Energy & Fuels
Jiang Bian, Ziyuan Zhao, Yang Liu, Ran Cheng, Xuerui Zang, Xuewen Cao
Summary: This study presents a novel method for ammonia separation using supersonic flow and develops a mathematical model to investigate the condensation phenomenon. The results demonstrate that the L-P nucleation model accurately characterizes the nucleation process of ammonia at low temperatures. Numerical simulations also show that increasing pressure and concentration can enhance ammonia condensation efficiency.
Article
Energy & Fuels
Shiyuan Pan, Xiaodan Shi, Beibei Dong, Jan Skvaril, Haoran Zhang, Yongtu Liang, Hailong Li
Summary: Integrating CO2 capture with biomass-fired combined heat and power (bio-CHP) plants is a promising method for achieving negative emissions. This study develops a reliable data-driven model based on the Transformer architecture to predict the flowrate and CO2 concentration of flue gas in real time. The model validation shows high prediction accuracy, and the potential impact of meteorological parameters on model accuracy is assessed. The results demonstrate that the Transformer model outperforms other models and using near-infrared spectral data as input features improves the prediction accuracy.