Article
Geochemistry & Geophysics
Yinqing Wang, Jinghong Hu, Weiwei Xie, Yuan Zhang
Summary: This study investigates the influence of operational parameters on the CO2 Huff-n-Puff EOR process in Eagle Ford shale oil reservoirs using response surface methodology (RSM). Single-factor analysis and a Box-Behnken model were used to determine the primary input variables and optimize the output factors. The injection rate was found to be the most significant factor, followed by injection time, cycle number, and primary depletion time. The optimal responses were identified as a primary depletion time of 2.37 years, injection time of 3.4 months, cycle number of 3, production time per cycle of 2.2 years, and injection rate of 5000 MSCF/D. The study demonstrates the usefulness of RSM for optimization and provides insights for designing the CO2 Huff-n-Puff process in shale oil reservoirs.
Article
Energy & Fuels
Xiangwen Kong, Hongjun Wang, Wei Yu, Ping Wang, Jijun Miao, Mauricio Fiallos-Torres
Summary: In this study, a comprehensive numerical compositional model combined with EDFM method was used to evaluate the geological and engineering controls on gas huff-n-puff in Duvernay shale volatile oil reservoirs. The results showed that fracture conductivity, natural fracture density, period of primary depletion, and natural fracture permeability are the most sensitive parameters for incremental oil recovery from gas huff-n-puff. Low fracture conductivity and a short period of primary depletion could greatly reduce the economic efficiency of the process.
Article
Energy & Fuels
Yilei Song, Zhaojie Song, Haiwei Zeng, Chunlei Tai, Xuya Chang
Summary: This study compared the enhanced oil recovery (EOR) performance of N-2 and CO2 Huff-n-puff methods at the pore level using nuclear magnetic resonance (NMR) technology. The results showed that both N-2 and CO2 Huff-n-puff methods improved tight oil recovery, with CO2 Huff-n-puff exhibiting better performance. The NMR transverse relaxation time (T-2) spectrum indicated that CO2 Huff-n-puff was more effective in enhancing oil recovery in large pores compared to N-2 Huff-n-puff. However, the conclusion should be further validated due to the potential error of NMR technology in measuring oil recovery in specific pores.
Article
Energy & Fuels
Chunmiao Ma, Fengqi Tan, Ninghong Jia, Jianhua Qin, Xiankun Li, Yuqian Jing, Ruihai Jiang
Summary: In this study, the production law and displacement mechanism of Jimusaer continental shale oil during CO2 huff 'n' puff were analyzed using nuclear magnetic resonance and computed tomography scanning, and the optimal parameters were determined. The results showed that CO2 huff 'n' puff mainly produced crude oil in pore throats with radii of 0.1-1 μm, while oil in pore throats with radii below 0.1 μm could not be produced. Multiple huff 'n' puff cycles connected fluids in fractures with fluids in large-medium pore throats, allowing for the development of both fractured and unfractured shales. The study also revealed that huff 'n' puff cycles and injection pressure had a significant influence on the efficiency of CO2 huff 'n' puff, while injection timing and soaking time had relatively small effects. The optimal CO2 huff 'n' puff parameters for the Jimusaer Sag were determined to be five cycles, 4 MPa injection timing, 25 MPa injection pressure, and 12-hour soaking time.
ENERGY SCIENCE & ENGINEERING
(2023)
Article
Energy & Fuels
Xiaofei Xiong, J. J. Sheng, Xiaofeng Wu, Jianghua Qin
Summary: The study demonstrates that conducting foam-assisted nitrogen huff-n-puff experiments in fractured shale cores can inhibit gas channeling, extend gas channeling time, and expand the swept area, thereby helping to improve oil recovery in shale reservoirs.
Article
Energy & Fuels
Do Yoon Moh, Hongwei Zhang, Shihao Wang, Xiaolong Yin, Rui Qiao
Summary: The study investigates the soaking step of CO2 Huff-n-Puff in a single, 4 nm-wide calcite pore using molecular dynamics simulations. The results show that CO2 molecules can be adsorbed on pore walls and diffuse along the walls or into the pore's interior as free molecules. The movement of adsorbed and free CO2 molecules inside the pore obeys a specific scaling law, highlighting the importance of surface adsorption in the storage and transport of CO2 in unconventional oil reservoirs.
Article
Energy & Fuels
Chao-Fan Zhu, Wei Guo, You-Ping Wang, Ya-Jun Li, Hou-Jian Gong, Long Xu, Ming-Zhe Dong
Summary: This study investigates the impact of fractures and kerogen in shale reservoirs on oil recovery during CO2 huff-n-puff operations. It reveals that rock properties play a significant role in determining recovery factors and CO2 usage efficiency in shale and sandstone formations. Optimal injection pressures and CO2 injection volumes are identified for enhanced oil recovery in fractured shale reservoirs.
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
Chao -Yu Sie, Quoc P. Nguyen
Summary: This study investigates the impact of reservoir rock and crude oil properties on the efficiency of oil extraction using the huff-n-puff method in shale reservoirs. The findings provide insights into the oil production characteristics and support the development of screening criteria for evaluating the suitability of unconventional reservoirs for this enhanced oil recovery (EOR) method. The results also serve as a valuable dataset for further modeling work.
Article
Engineering, Chemical
Qian Sun, Aabiskar Bhusal, Na Zhang, Kapil Adhikari
Summary: In this study, a new method was proposed to estimate the MMP of shale oil/CO2 systems using huff-n-puff molecular dynamics simulations. The obtained results were in good agreement with experimental data. The oil recovery increased with the rise of reservoir temperature and slit height, but the MMP inside the nanopore was lower than the bulk counterpart due to confinement effect. CO2 huff-n-puff has the benefits of oil recovery and carbon sequestration.
CHEMICAL ENGINEERING SCIENCE
(2023)
Article
Engineering, Chemical
Tong Wang, Bo Xu, Yatong Chen, Jian Wang
Summary: In this study, CO2 huff-n-puff laboratory experiments were conducted on the Chang 7 shale oil reservoir, and the utilization of microscopic pore fluid in short samples was investigated using the NMR technique. The seven controlling factors and their recovery-enhancing mechanisms of CO2 huff-n-puff were analyzed and discussed. The experimental results showed that the cumulative recovery increased with the number of huff-n-puff cycles, but the degree of cycle recovery decreased due to the limitation of the production differential pressure. Increasing the minimum depletion pressure and gas injection amount achieved a significant increase in recovery after CO2 mixed-phase drive. The pressure depletion rate was found to be the main factor affecting the CO2 huff-n-puff effect in shale.
Article
Energy & Fuels
Huang Xing, L. Xiang, Zhang Yi, L. Tiantai, Zhang Rongjun
Summary: The parameters of shale rock samples, such as pore size distribution, specific surface area, and pore volume, are analyzed through low-temperature nitrogen adsorption experiment. The effects of gas injection pressure, soaking time, and fractures on the oil production characteristics of shale pores are studied using nuclear magnetic resonance experiments of CO2 huff and puff in shale samples. The recovery degrees of small pores and large pores are quantitatively evaluated. Experimental results show that the recovery degree of crude oil in large pores increases with injection pressure under immiscible conditions, while the effect decreases under miscible conditions. The recovery degree of crude oil in small pores maintains a linear increase with injection pressure, and the lower size limit of recoverable oil decreases with gas injection pressure. The soaking time affects the recovery degrees of crude oil in both small and large pores, with an optimal soaking time of about 10 hours. The presence of fractures enhances the recovery degrees of crude oil in both small and large pores.
PETROLEUM EXPLORATION AND DEVELOPMENT
(2022)
Review
Energy & Fuels
Muhend Milad, Radzuan Junin, Akhmal Sidek, Abdulmohsin Imqam, Mohamed Tarhuni
Summary: In recent times, there has been a significant increase in global energy demand, leading to the depletion of conventional oil reservoirs. To meet this growing energy demand, there has been a focus on seeking alternative oil resources, particularly unconventional oil formations like shale oil reservoirs. While shale oil reservoirs have been successful, challenges remain such as rapidly declining oil flow rates and oil retention in pores.
Article
Energy & Fuels
Samuel Afari, Kegang Ling, Billel Sennaoui, Demetrius Maxey, Tomiwa Oguntade, Jerjes Porlles
Summary: This study investigates the impact of operational parameters on oil recovery and gas utilization in the CO2 huff-n-puff process in unconventional reservoirs. The study reveals that production bottom hole pressure and production period have the most significant influence on oil recovery, while injection rate and period have little effect. Increasing the soak period has a negative impact on oil recovery. Furthermore, the study uncovers several significant interactions among these parameters.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2022)
Article
Energy & Fuels
Sheng Li, Mingzhe Dong, Peng Luo
Summary: This study investigates the recovery mechanisms of shale oil, with a focus on the time-dependent release of dissolved oil from kerogen using a non-equilibrium mass transfer model. Results show that cases with dissolved oil produce significantly more oil than those without, and CO2 storage mainly occurs in kerogen. The study provides valuable insights into oil recovery, CO2 storage, and shale gas and coal bed methane recovery.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2021)
Article
Energy & Fuels
M. Gu, E. Dao, K. K. Mohanty
Article
Energy & Fuels
M. Gu, K. K. Mohanty
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2015)
Article
Thermodynamics
Jianli Wang, Bai Song, Ming Gu, Xing Zhang
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2010)
Article
Engineering, Geological
M. Gu, K. K. Mohanty
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
(2014)
Article
Thermodynamics
Ming Gu, Jian-li Wang, Xing Zhang
INTERNATIONAL JOURNAL OF THERMOPHYSICS
(2009)
Article
Thermodynamics
Jianli Wang, Ming Gu, Bai Song, Xing Zhang
INTERNATIONAL JOURNAL OF THERMOPHYSICS
(2010)
Article
Physics, Applied
J. L. Wang, M. Gu, X. Zhang, Y. Song
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2009)
Article
Instruments & Instrumentation
Jianli Wang, Ming Gu, Xing Zhang, Gangping Wu
REVIEW OF SCIENTIFIC INSTRUMENTS
(2009)
Article
Geochemistry & Geophysics
Ming Gu, Deepak Gokaraju, Dingding Chen, John Quirein
Article
Geochemistry & Geophysics
Ming Gu, John Quirein, Eric Murphy, Saul Rivera Barraza, Liwei Ou
Article
Materials Science, Multidisciplinary
Wang Jian-li, Gu Ming, Ma Wei-gang, Zhang Xing, Song Yan
NEW CARBON MATERIALS
(2008)
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.