Article
Energy & Fuels
Ge Zhu, Shimin Dong
Summary: This study created a fluid-structure coupling hydraulic fracturing simulation model with consideration of fatigue damage to investigate the effects of pulsating pressure on rock fracturing. The results indicate that compared to conventional hydraulic fracturing, pulsating pressure can reduce the breakdown pressure, activate natural fractures, and increase the complexity of hydraulic fractures.
GEOMECHANICS AND GEOPHYSICS FOR GEO-ENERGY AND GEO-RESOURCES
(2022)
Article
Energy & Fuels
Yanan Hou, Yan Peng, Zhangxin Chen, Yishan Liu, Yingying Tian
Summary: Pulsating hydraulic fracturing (PHF) can generate a complex fracture network with lower breakdown pressure and less induced seismicity. The distribution of fluid pressure in hydraulic fractures determines the initiation and propagation of new fractures in the PHF, which has not been fully investigated. By exploring the fluid pressure distribution in hydraulic fractures using a transient flow model (TFM), it is found that the pressure fluctuation amplitudes are heterogeneously distributed in the fractures during the PHF. This phenomenon is caused by a standing wave formed in the fractures, which can be divided into categories based on input frequency. Friction and fracture roughness have effects on the pressure distribution, with increasing friction reducing heterogeneity and high roughness affecting fluid pressure amplitudes. Multiple initiations of new fractures can be obtained by optimizing input frequency and amplitude.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2022)
Article
Geosciences, Multidisciplinary
Henrik Wachtmeister, Magdalena Kuchler, Mikael Hook
Summary: This paper examines the political claims and hopes surrounding Poland's potential self-sufficiency in natural gas and becoming a gas exporter through shale gas production. It suggests that achieving such national expectations would require a significant amount of drilling and hydraulic fracturing, which would necessitate reconsideration of national energy security plans and expectations related to shale gas production.
NATURAL RESOURCES RESEARCH
(2021)
Article
Engineering, Ocean
Xiaolong Ma, Youhong Sun, Wei Guo, Rui Jia, Bing Li
Summary: The research found that a 5-meter horizontal fracture length in the hydrate reservoir significantly increased gas production when the horizontal well was located in different areas within the gas hydrate-bearing layer. Increasing the fracture length from 5 to 20 meters only slightly increased gas production. Additionally, the promotion effects of horizontal fractures on gas production varied based on the location of the horizontal well within the reservoir.
APPLIED OCEAN RESEARCH
(2021)
Article
Thermodynamics
Zhaoyi Liu, Zhejun Pan, Shibin Li, Ligang Zhang, Fengshan Wang, Lingling Han, Jun Zhang, Yuanyuan Ma, Hao Li, Wei Li
Summary: The study focused on the influence of typical fracture characteristics of volcanic rocks on hydraulic fracturing through numerical research and verification based on indoor tests and simulations. The results indicated that a decrease in the cementation strength ratio leads to an increase in hydraulic fracture propagation rate, with the cementation strength and morphology of NFs significantly affecting the propagation direction of HFs.
Article
Thermodynamics
Yongge Liu, Guo Li, Jing Chen, Yajie Bai, Jian Hou, Hongzhi Xu, Ermeng Zhao, Zhangxin Chen, Jiayuan He, Le Zhang, Xueqi Cen, Evgeny Chuvilin
Summary: A new simulation method was developed to study the hydraulic fracturing-assisted depressurization development of hydrate bearing layers (HBLs). The results showed that the permeability of the HBL has a significant influence on the stimulation performance of fracturing.
Article
Microbiology
Maria Fernanda Campa, Jeremy R. Chen See, Lavinia Unverdorben, Olivia G. Wright, Kimberly A. Roth, Jonathan M. Niles, Daniel Ressler, Ella M. S. Macatugal, Andrew D. Putt, Stephen M. Techtmann, Timothy L. Righetti, Terry C. Hazen, Regina Lamendella
Summary: The environmental implications of unconventional oil and gas extraction are only recently starting to be systematically recorded. Our research shows the utility of microbial communities paired with geochemical markers to build strong predictive random forest models of unconventional oil and gas activity and the identification of key biomarkers.
MICROBIOLOGY SPECTRUM
(2022)
Article
Energy & Fuels
Peng Shi, Shibin Wang, Cheng Ouyang, Nanpeng Yang, Junlong Li
Summary: The use of NSDR to reduce the adsorption damage of hydroxypropyl guar gum to sandstone reservoirs was studied. It was found that NSDR can disrupt the adsorption force between the guar gum and rock, improving pore throat structure and enhancing the stimulation effect of the reservoir.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2022)
Article
Engineering, Petroleum
A. S. Gundogar, J. L. Druhan, C. M. Ross, A. D. Jew, J. R. Bargar, A. R. Kovscek
Summary: Field and laboratory observations show that the efficiency of hydraulic fracturing is affected by geochemical alterations to rock surfaces, which can block pore and fracture networks. The study focuses on changes to fluid chemistry and shale surfaces resulting from shale-fluid interactions. Different shale samples have different responses to fluid injection, indicating the importance of understanding the specific characteristics of the formation.
Article
Energy & Fuels
Yifeng Shen, Youhong Sun, Guobiao Zhang, Yun Qi, Hengfeng Shan, Bing Li
Summary: Hydraulic fracturing is a promising technique for improving gas productivity and energy efficiency in low-permeability hydrate reservoirs. However, the impact of fracturing fluids on hydrate reservoirs has not been well studied. This research simulated the invasion of fracturing fluid into hydrate reservoirs and found that it can cause phase transitions and affect fracturing. The results provide important guidance for the application of hydraulic fracturing in field tests of hydrate reservoirs.
Article
Energy & Fuels
Qiusheng Ye, Chengwu Li, Tao Yang, Yilin Wang, Zhenfei Li, Yifan Yin
Summary: This study investigates the desorption and diffusion of methane in coal seams using an experimental system, and finds that the desorption process is a heat absorption and cooling process influenced by equilibrium pressure and the particle size of the coal samples. The results have important implications for accurately measuring coal bed methane content and preventing and controlling coal mine gas disasters.
Article
Mechanics
Luis. F. Paullo Munoz, Cristian Mejia, Julio Rueda, Deane Roehl
Summary: Hydraulic fracturing is a commonly used technique for enhancing reservoir permeability. Mathematical modeling of this process can be complex and computationally expensive, especially in 3D models. Researchers have developed computational tools to ensure accuracy and reduce costs. This study proposes a method using the Displacement Discontinuity Method and Finite Element Method to model hydraulic fracturing, and it shows promising results when applied to different conditions. The method's accuracy and reduced computational time make it a potential alternative for more complex fracture analyses.
ENGINEERING FRACTURE MECHANICS
(2022)
Article
Green & Sustainable Science & Technology
Ning Li, Heping Xie, Ziqi Gao, Cunbao Li
Summary: This study investigates the coupling effect of horizontal stress difference and injection rate on hydraulic fracturing through a series of true triaxial hydraulic fracturing tests and establishes hydraulic fracturing and gas fracturing models. The study compares the differences in fracture width, length, and network morphology between the two techniques under varying horizontal stress differences and injection rates.
Article
Geosciences, Multidisciplinary
Xinglong Zhao, Bingxiang Huang, Giovanni Grasselli
Summary: The study investigates the mechanism of natural fracture failure induced by disturbing stress using numerical calculation methods. It reveals the shear failure mechanism of natural fractures during hydraulic fracturing and the mechanical changes when hydraulic fracturing approaches natural fractures.
FRONTIERS IN EARTH SCIENCE
(2021)
Article
Engineering, Civil
Tianming Huang, Zhenbin Li, Yin Long, Fen Zhang, Zhonghe Pang
Summary: This study investigates the mechanism behind changes in isotopic compositions and ratios following hydraulic fracturing in shale gas reservoirs. The results suggest that adsorption-desorption and ion exchange are critical factors in controlling the isotopic composition changes.
JOURNAL OF HYDROLOGY
(2022)
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.