Article
Energy & Fuels
Mukhtar Elturki, Abdulmohsin Imqam
Summary: It is essential to investigate gas injection methods to produce the trapped oil in unconventional resources. However, the injection process can cause asphaltene depositions inside the reservoir, leading to plugging of pores and oil recovery reduction. This study examines the significance of CO2 injection in oil recovery and identifies the critical parameters that could impact the effectiveness of CO2 huff-n-puff operation in unconventional formations.
Article
Biotechnology & Applied Microbiology
Jie Chi, Xing Zhang
Summary: With the increasing global demand for oil and gas fuels, the development of extremely low permeability oil and gas reservoirs has become increasingly important. The immiscible displacement method can achieve better development effect, while stress sensitivity factors also impact the recovery degree of reservoirs.
ENVIRONMENTAL TECHNOLOGY & INNOVATION
(2021)
Article
Energy & Fuels
Mukhtar Elturki, Abdulmohsin Imqam
Summary: This study investigated the effects of cyclic N-2 injection on oil recovery and asphaltene precipitation in shale cores. The results showed that cyclic N-2 injection increased oil recovery but worsened the wettability of the cores, leading to asphaltene deposition and pore plugging.
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
Qian Wang, Jian Shen, Piroska Lorinczi, Paul Glover, Shenglai Yang, Hao Chen
Summary: Miscible CO2-SAG flooding, by adding a CO2 soaking process after CO2 breakthrough, improves the recovery and permeability variation during CO2 flooding, especially in areas with low permeability and high residual oil saturation. The soaking process leads to more homogeneous distribution of permeability decline and a greater increase in permeability decline, with significant improvement in recovery observed in lower permeability cores.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2021)
Article
Energy & Fuels
Madiyar Koyanbayev, Lei Wang, Yanwei Wang, Muhammad Rehan Hashmet, Randy D. Hazlett
Summary: Proper handling of produced sour gas is a challenge due to H2S and CO2, and reinjecting it into oil reservoirs is an environmentally friendly and economically attractive method. This study investigates the effect of gas composition and reservoir heterogeneity on oil recovery using sour gas injection. Analyses and simulations show that higher H2S content in injected gas narrows the two-phase envelope and decreases bubble point pressure, and increasing H2S concentration in sour gas improves oil recovery efficiency. These findings are useful for designing sour gas injection for enhanced oil recovery in reservoirs with access to sour gas sources.
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
Yongmao Hao, Jianfa Li, Chuixian Kong, Yingchun Guo, Guangzhong Lv, Zhihao Chen, Xinlin Wei
Summary: The CO2-crude oil miscible zone is crucial for improving the recovery of miscible flooding, and its migration behavior was studied through defining characteristic parameters and analyzing its behavior. The sweep coefficient and area of the miscible zone increase linearly before the front edge breakthrough, and decrease gradually after reaching a local maximum, while the fingering coefficient increases rapidly. After the rear edge breakthrough, the sweep coefficient's increase rate drops significantly, leading to a gradual decrease and stabilization of the area, width and fingering coefficient of the miscible zone.
PETROLEUM SCIENCE AND TECHNOLOGY
(2021)
Article
Geosciences, Multidisciplinary
Sen Yang, Yangmengzhe Xu, Zhiwei Huang, Qunshuang Zhang, Ting Liu, Xuelei Li
Summary: This study conducted experimental evaluation and numerical simulation research on the adaptability of CO2 flooding in beach-bar sand reservoirs in the Dongying Sag. The results showed that the recovery factor of CO2 flooding is higher than that of water flooding, and the displacement distance of CO2 in the reservoir is significantly larger than that of water injection development. Therefore, CO2 flooding can effectively increase the oil recovery and economic benefits of this type of reservoir.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Energy & Fuels
Behnam Shahsavani, Masoud Riazi, Mohammad Reza Malayeri
Summary: The precipitation behavior of asphaltene is controlled by the concentration and relative distribution of sub-fractions within oils 1, 2, and 3, while different ions affect the size of water droplets and the presence of asphaltene in emulsions. The addition of tetrahydrofuran (THF) slows down asphaltene precipitation by diluting the oil phase at the oil/water interface.
Article
Multidisciplinary Sciences
Hossein Mehrjoo, Ali Safaei, Yousef Kazemzadeh, Masoud Riazi, Farid B. Cortes
Summary: This study investigated the performance of rich gases in the gas injection process. The effect of injection fluids on relative permeability, gas saturation profile, and fractional flow of gas was studied through simulation. The results showed that the IFT between rich gas and naphtha was lower, and the gas oil ratio and injection pressure did not affect the performance of rich gases in NGL and LPG. However, at a gas oil ratio of 1.25 MSCF/STB and higher injection pressure, the movement of rich gas with naphtha, as well as the relative permeability and fractional flow of gas, were affected. Therefore, it is suggested to inject naphtha at low pressure and high gas oil ratio.
SCIENTIFIC REPORTS
(2023)
Article
Engineering, Petroleum
Mukhtar Elturki, Abdulmohsin Imqam
Summary: Gas-enhanced oil recovery by nitrogen injection is efficient but may cause asphaltene deposition. This research focused on nitrogen impact on asphaltene precipitation in nanopores, leading to pore plugging and reduced oil recovery. Increasing nitrogen injection pressure and longer mixing time resulted in higher asphaltene content, causing significant pore plugging.
Article
Energy & Fuels
Dali Hou, Jinghui Li, Hongming Tang, Jianchun Guo, Xueni Xiang
Summary: This paper investigates the application of CO2-water co-injection in low-permeability near-critical volatile reservoirs through experiments and simulations. The results show that CO2-water co-injection can improve oil recovery and increase displacement efficiency, mainly due to the dissolution of CO2 in water, effectively inhibiting gas channeling.
Article
Energy & Fuels
Qian Wang, Jian Shen, Paul W. J. Glover, Piroska Lorinczi, Wei Zhao
Summary: CO2-SAG flooding can improve oil recovery and result in more homogeneous distribution of oil production and permeability decline, while reducing the contribution of asphaltene particle blockage.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2022)
Article
Energy & Fuels
Ping Wang, Xiaofang Li, Zhengwu Tao, Sen Wang, Jiawei Fan, Qihong Feng, Qingzhong Xue
Summary: The study investigates the miscible behaviors of different gas and crude oils in nanoslits through molecular dynamics simulations, finding that gas type, polarity, and crude oil chain length can affect the miscibility process, with CO2, CH4, C3H8, and N2 being more miscible with apolar crude oil.
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.