Energy & Fuels最新文献

{"title":"Influence of Chitosan Salt on Capillary Pressure and Interfacial Tensions of CO2/Brine and H2/Brine Systems","authors":"Ahmed Al-Yaseri*,&nbsp;Nurudeen Yekeen and Mahmoud A. Abdulhamid,&nbsp;","doi":"10.1021/acs.energyfuels.4c0447110.1021/acs.energyfuels.4c04471","DOIUrl":"https://doi.org/10.1021/acs.energyfuels.4c04471https://doi.org/10.1021/acs.energyfuels.4c04471","url":null,"abstract":"<p >There is increasing interest in attainment of a CO₂-free global economy and net zero carbon emissions by 2050 to mitigate the negative impact of global warming and unfavorable climate change. However, the success of large-scale underground H₂ and CO₂ storage depends on the rock wetting behavior and dynamics of gas/brine interfacial tension (IFT), which significantly influences capillary pressure. Previous studies have demonstrated that rock wettability can be altered into a hydrophilic state using surface-active chemicals such as surfactants, nanoparticles, methyl orange, and methyl blue. However, these chemicals also showed higher propensity to reduce the gas/brine IFT, which is unfavorable for the residual and structural trapping potential of the host rock. Herein, the limestone wettability modification capacity of a polymeric surfactant (chitosan salt) and its impacts on CO₂/brine and H₂/brine IFT were evaluated using the pendant drop technique and by capillary pressure measurement. Results showed that the capillary pressure shifted to the right in the presence of chitosan salt solutions, indicating a reduction in the pressure needed to push water into the pore spaces of the rock. This effect increased with increasing concentrations of chitosan salt solution from 100 to 1000 ppm. Specifically, at 200 psi, the residual water saturation of seawater-saturated limestone cores increased from about 50 to 70% whereas that of deionized water-saturated limestone increased from 25 to about 40% in the presence of 1000 ppm chitosan salt concentration. The presence of chitosan salt at the CO₂/water interface and H₂/water interface showed no significant effects on interfacial tension. Moreover, the adsorption of DI water and seawater molecules on limestone rock was higher in the presence of chitosan salt, suggesting that the salt promotes adhesion of H₂O molecules but discourages the adsorption of H₂ and CO₂ molecules on limestone rock. Our results generally demonstrated that chitosan salt solution can modify the wettability of hydrophobic limestone rocks, turning them into water wet while mitigating the reduction in IFT, which could increase the pressure needed to push water into the pore spaces of the host rock. Hence, saturation of geo-storage of rocks with chitosan salt solution is a promising strategy for derisking underground H₂ and CO₂ storage and optimizing the residual and structural trapping potential of geo-storage formations.</p>","PeriodicalId":35,"journal":{"name":"Energy & Fuels","volume":"38 24","pages":"23685–23698 23685–23698"},"PeriodicalIF":5.2,"publicationDate":"2024-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142850231","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"BiVO4 Polaron-Hopping State-Induced Low-Bias Spintronic Water Splitting Device","authors":"Yi-Sheng Lai*,&nbsp;Hung-Yu Shen and Cheng-Ju Yang,&nbsp;","doi":"10.1021/acs.energyfuels.4c0452810.1021/acs.energyfuels.4c04528","DOIUrl":"https://doi.org/10.1021/acs.energyfuels.4c04528https://doi.org/10.1021/acs.energyfuels.4c04528","url":null,"abstract":"<p >Both n-type and p-type BiVO₄ photoelectrodes demonstrate a high performance in water splitting devices, with an ultrahigh solar to hydrogen energy conversion performance as high as 6.77 and 7.51%, respectively. The external quantum efficiencies of the n-type and p-type BiVO₄ photoelectrodes under 520 nm laser irradiation are 54.52 and 48.38%, respectively. Besides, over 49 L of hydrogen gases evolved from the n-type BiVO₄ photoelectrode and over 32 L of hydrogen gases from the p-type BiVO₄ photoelectrode. With the polaron surface state and the polaron-hopping energy level, the p-type BiVO₄ demonstrated over 50% spin polarization rate since ℏ/–ℏ angular momentum-modulated circular polarization serves as the spintronic excitation light source. The hole-trapping Fermi level of the p-type BiVO₄ affords the water splitting devices a shorter path for hole transportation than the n-type BiVO₄.</p>","PeriodicalId":35,"journal":{"name":"Energy & Fuels","volume":"38 24","pages":"23677–23684 23677–23684"},"PeriodicalIF":5.2,"publicationDate":"2024-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142850323","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Improved Hydrogen Storage Kinetic Properties of MgH2 with NiO/NiCo(Fe)2O4/(Ni)","authors":"Yi Jiang,&nbsp;Nan Si*,&nbsp;Zan Wang,&nbsp;Hui Zhang and Wei Jiang*,&nbsp;","doi":"10.1021/acs.energyfuels.4c0464010.1021/acs.energyfuels.4c04640","DOIUrl":"https://doi.org/10.1021/acs.energyfuels.4c04640https://doi.org/10.1021/acs.energyfuels.4c04640","url":null,"abstract":"<p >Developing catalysts with exceptional catalytic activity is crucial in solid hydrogen storage. Two catalysts, NiO/NiCo₂O₄ and NiO/NiFe₂O₄/Ni, are successfully prepared and incorporated into MgH₂ for the first time to investigate the hydrogen storage properties of MgH₂. The experimental results indicate that the hydrogen desorption temperatures for the composites of MgH₂ + 5 wt % NiO/NiCo₂O₄ (MgH₂ + NC) and MgH₂ + 5 wt % NiO/NiFe₂O₄/Ni (MgH₂ + NF) occur at 241 and 175 °C, respectively. Hydrogen desorption of ball-milled MgH₂ begins at 272 °C. Both MgH₂ + NF and MgH₂ + NC exhibit excellent hydrogen absorption kinetics. At 150 °C and 3 MPa, MgH₂ + NF and MgH₂ + NC can absorb 5.93 and 5.95 wt % of H₂ in as little as 1 min, respectively. The desorption activation energies of MgH₂ + NF and MgH₂ + NC are 88.38 and 81.56 kJ/mol, respectively, compared to pure MgH₂, which has an <i>E</i>_a of 181.4 kJ/mol. Furthermore, cycle experiments demonstrate that both MgH₂ + NC and MgH₂ + NF display excellent cycle stability, maintaining hydrogen storage capacities of approximately 99.8 and 98%, respectively, after 10 cycles. In situ formed Fe extends the defect structure and interfaces with MgH₂, thus providing additional hydrogen diffusion channels. Moreover, the embedded clusters of Mg₂NiH₄/Mg₂CoH₅ function as “multistage hydrogen pumps”, providing surface pathways for efficient hydrogen absorption. This study offers experimental evidence and novel insights aimed at enhancing the kinetic performance of MgH₂ for hydrogen storage.</p>","PeriodicalId":35,"journal":{"name":"Energy & Fuels","volume":"38 24","pages":"23804–23814 23804–23814"},"PeriodicalIF":5.2,"publicationDate":"2024-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142849904","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"PET-Derived Carbon Quantum Dots as Nano Tracers for Sandstone Reservoirs","authors":"Madiha Farooq,&nbsp;Sikandar Bind,&nbsp;Himanshu Singh,&nbsp;Sourav Das and Himanshu Sharma*,&nbsp;","doi":"10.1021/acs.energyfuels.4c0458310.1021/acs.energyfuels.4c04583","DOIUrl":"https://doi.org/10.1021/acs.energyfuels.4c04583https://doi.org/10.1021/acs.energyfuels.4c04583","url":null,"abstract":"&lt;p &gt;Tracers play an important role in understanding fluid flow through subsurface porous media, such as reservoir connectivity and heterogeneity, in various applications including groundwater monitoring, CO&lt;sub&gt;2&lt;/sub&gt; sequestration, and oil recovery. However, commonly used tracers, like radioactive tracers, fluorescent dyes, and fluorinated compounds, are not environmentally benign. Previous studies have investigated the use of nanoparticles as potential subsurface tracers. However, these nanoparticles are unable to survive harsh conditions of high temperature and salinity often encountered in the subsurface and show high retention in porous media. Furthermore, studies on the transport of nanoparticles through porous media, particularly in the presence of another immiscible phase, are scarce in the literature. In this study, systematic experimental work was carried out to investigate the potential of carbon quantum dots (CQDs), synthesized from waste poly(ethylene terephthalate) (PET) bottles, as subsurface tracers for sandstone reservoirs. The synthesis process involved calcination, acid hydrolysis, and nitrogen doping. The calcination step breaks down the poly(ethylene terephthalate) (PET) polymer into smaller hydrocarbons. The acid treatment and nitrogen doping (via a hydrothermal process) lead to further carbonization, nucleation, growth, and surface passivation of CQDs, introducing various oxygen- and nitrogen-containing surface functional groups, thus impacting the hydrophilicity and aqueous stability of CQDs. The synthesized CQDs were characterized by using various analytical techniques such as diffraction light scattering, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, transmission electron microscopy, ultraviolet–visible spectroscopy, and photoluminescence spectroscopy. The FT-IR and XPS results confirmed the presence of various functional groups such as hydroxyl (-OH), carboxyl (-COOH), ester (-COOR), and amines (-NH&lt;sub&gt;2&lt;/sub&gt;). These functional groups account for the hydrophilic nature of the CQDs. The TEM images showed that the average diameter of the CQDs was 4.24 nm. The fluorescence quantum yield of the CQDs was 16%. The zeta potential of CQDs was found to be −52.17 mV. The stability of aqueous suspensions of CQDs was studied in seawater and brines containing 10 wt % NaCl up to 60 °C. The effect of divalent calcium ions on the stability of CQDs suspension was also studied. Following this, the transport of CQDs through porous media was studied. These experiments were also performed in the presence of another immiscible phase (&lt;i&gt;n&lt;/i&gt;-decane). The CQDs were stable in brines containing up to 10 wt % NaCl and at a temperature of up to 60 °C. Furthermore, the CQDs were also stable in seawater and the brines containing 10 wt % NaCl and 2 wt % calcium chloride at 60 °C. No noticeable partitioning of CQDs in &lt;i&gt;n&lt;/i&gt;-decane and negligible adsorption on sand was observed. Transport experiments showed that the","PeriodicalId":35,"journal":{"name":"Energy & Fuels","volume":"38 24","pages":"23407–23421 23407–23421"},"PeriodicalIF":5.2,"publicationDate":"2024-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142842152","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of Temperature and Inoculum-to-Substrate Ratios on Two-Stage Biohydrogen and Methane Production from Sugarcane Molasses","authors":"Tirthankar Mukherjee,&nbsp;Nimesha Senevirathne,&nbsp;Prawit Kongjan and Prasad Kaparaju*,&nbsp;","doi":"10.1021/acs.energyfuels.4c0424810.1021/acs.energyfuels.4c04248","DOIUrl":"https://doi.org/10.1021/acs.energyfuels.4c04248https://doi.org/10.1021/acs.energyfuels.4c04248","url":null,"abstract":"<p >The effect of temperature (37 and 55 °C) and inoculum-to-substrate ratios (ISRs) on biohydrogen (first-stage ISRs 0.25, 0.5, and 1) and methane (second-stage ISRs 2, 4, and 6) production during two-stage anaerobic digestion of molasses using mixed anaerobic consortia was investigated. At 37 °C, ISRs 1 and 4 produced the highest yields of biohydrogen (63.61 NL-H₂/kg-VS_added) (VS: volatile solid) and methane (1092.70 NL-CH₄/kg-VS_added). At 55 °C, ISR 0.5 yielded 25.03 NL-H₂/kg-VS_added, while ISR 4 yielded 806.54 NL-CH₄/kg-VS_added. Firmicutes, specifically Clostridia, dominated the first stage at both temperatures. The second stage (ISR 4) at 37 °C included 16.06% Chloroflexi and 22.84% Firmicutes, while at 55 °C, it included 7.55% Thermotogota.</p>","PeriodicalId":35,"journal":{"name":"Energy & Fuels","volume":"38 24","pages":"23560–23575 23560–23575"},"PeriodicalIF":5.2,"publicationDate":"2024-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142842224","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Evaporated, Semitransparent Rudorffite AgBiI4 Films for Pb-Free Indoor Photovoltaics","authors":"Soohwan Lim,&nbsp;Jeong-Yeon Back,&nbsp;Byeong-Cheol Jeon,&nbsp;Jeonghye Park,&nbsp;Junghun Lee,&nbsp;Eun-Jung Kim,&nbsp;Eundo Kim,&nbsp;Hee Jung Park,&nbsp;Jinhyun Kim* and Taeho Moon*,&nbsp;","doi":"10.1021/acs.energyfuels.4c0421510.1021/acs.energyfuels.4c04215","DOIUrl":"https://doi.org/10.1021/acs.energyfuels.4c04215https://doi.org/10.1021/acs.energyfuels.4c04215","url":null,"abstract":"<p >The toxicity of Pb continues to pose a significant risk to the commercialization of perovskite solar cells, particularly in indoor applications. Rudorffite Ag_<i>x</i>Bi_<i>y</i>I_{<i>x</i>+3<i>y</i>} (ABI) with wide bandgap emerges as a promising Pb-free absorber for indoor photovoltaics. Vapor processing allows for precise thickness control, easy multilayer film formation, and the potential for large-scale production. This study introduces the photovoltaic performance of devices employing vapor-processed ABI thin films under indoor light illumination for the first time. The hexagonal rudorffite AgBiI₄ thin films, possessing a bandgap of 1.89 eV, were produced via sequential evaporation of BiI₃ and AgI, effectively capturing the spectrum of the white light-emitting diode. Moreover, the transmittance of these ∼65 nm thick AgBiI₄ thin films demonstrates their potential in semitransparent devices. Devices with these evaporated, semitransparent AgBiI₄ absorbers achieved a power conversion efficiency of 2.12% (7.02 μW/cm²) under 1000 lx. The stability of these devices was tested in an ambient atmosphere without encapsulation. Accelerated degradation was observed under 1000 lx compared to 1 sun, indicating increased sensitivity to aging under low light intensities.</p>","PeriodicalId":35,"journal":{"name":"Energy & Fuels","volume":"38 24","pages":"23741–23745 23741–23745"},"PeriodicalIF":5.2,"publicationDate":"2024-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142849903","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"H2 Regulates the Sulfur Vacancy of Mo-Doped WS2 for Electrochemical Hydrogen Evolution Reaction","authors":"Lei Liu,&nbsp;Xin Zhou,&nbsp;Xinzhuo Wang,&nbsp;Ning Liu*,&nbsp;Chengna Dai,&nbsp;Ruinian Xu,&nbsp;Gangqiang Yu,&nbsp;Ning Wang and Biaohua Chen,&nbsp;","doi":"10.1021/acs.energyfuels.4c0491310.1021/acs.energyfuels.4c04913","DOIUrl":"https://doi.org/10.1021/acs.energyfuels.4c04913https://doi.org/10.1021/acs.energyfuels.4c04913","url":null,"abstract":"<p >The development of efficient and economical nonprecious metal electrocatalysts is crucial for advancing the industrialization of the hydrogen evolution reaction (HER) in water electrolysis. WS₂ has become a hotspot in HER research due to its unique physicochemical properties and potential applications. In this work, a series of Mo-WS₂-n (n = 0, 0.3, 0.5 and 1.0, representing H₂ pressure) samples with abundant sulfur vacancies were prepared by utilizing H₂ as the structure directing agent (SDA). Among them, the Mo-WS₂-0.5 sample possessing abundant sulfur vacancies demonstrated best acidic HER performance by displaying an overpotential of 146 mV at 10 mA cm^–2 and the Tafel slope of 46.8 mV dec^–1, which is superior to most reported WS₂-based electrocatalysts. Furthermore, Mo-WS₂-0.5 exhibits good stability, proving its potential in practical applications. During the synthesis process, H₂ can effectively remove S atoms from WS₂ to create sulfur vacancies. Theoretical calculations unravel that both Mo doping and sulfur vacancies can significantly reduce the Gibbs free energy of hydrogen atom adsorption (Δ<i>G</i>_H) of WS₂. This study not only offers new insights into understanding the effects of metal doping and sulfur vacancies in WS₂ on acidic HER, but also provides a practical approach for designing low-cost and high-performance non-noble metal electrocatalysts.</p>","PeriodicalId":35,"journal":{"name":"Energy & Fuels","volume":"38 24","pages":"23847–23856 23847–23856"},"PeriodicalIF":5.2,"publicationDate":"2024-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142849905","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of Supercritical CO2–Water–Shale Interaction on Pore Evolution and Oil Composition","authors":"Chenrui Wang,&nbsp;Caspar Daniel Adenutsi,&nbsp;Shuai Zheng,&nbsp;Yuqi Sun,&nbsp;Zhiping Li* and Zixuan Huo,&nbsp;","doi":"10.1021/acs.energyfuels.4c0506810.1021/acs.energyfuels.4c05068","DOIUrl":"https://doi.org/10.1021/acs.energyfuels.4c05068https://doi.org/10.1021/acs.energyfuels.4c05068","url":null,"abstract":"<p >Supercritical CO₂ (ScCO₂) soaking significantly impacts pore structure evolution and oil composition in tight shale oil reservoirs. This study conducted static soaking experiments under actual reservoir temperature and pressure, and the brine and deionized water were used as control fluids. The variations in pore structures and properties are characterized using scanning electron microscopy (SEM), X-ray diffraction, low-field nuclear magnetic resonance core analysis system, low-temperature nitrogen adsorption, and gas chromatography in shale samples before and after ScCO₂ soaking. Results show ScCO₂ soaking enhances pore connectivity, particularly in microscale and mesoscale pores, by dissolving carbonates and feldspar, increasing pore volume (+30%), surface area (+4.9%), and average pore diameter (+9%). SEM images reveal fracture expansion and new pore formation due to mineral dissolution and precipitation during ScCO₂ soaking. Wettability analysis shows a shift from water-wet to CO₂-wet conditions, with increased contact angles for deionized water (+18.8%) and brine (+40.5%) after 15 days. An increasing trend in the hydrophobicity of the shale matrix can be observed. Gas chromatography indicates a rise in C15–C30 fractions and heavy hydrocarbons, increasing the shale oil’s average molecular weight to 298.36 g/mol. These findings provide new insights into the feasibility of using CO₂ to enhance oil recovery and CO₂ sequestration in shale reservoirs. Enhancing pore connectivity and altering wettability properties can potentially improve shale oil development.</p>","PeriodicalId":35,"journal":{"name":"Energy & Fuels","volume":"38 24","pages":"23535–23548 23535–23548"},"PeriodicalIF":5.2,"publicationDate":"2024-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142842390","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Research on Rock Fracturing by High-Intensity Electric Shock Fracturing─A Perspective on Images of Fracture Surfaces","authors":"Baisheng Nie*,&nbsp;Zhehao Zhang*,&nbsp;Xirong He,&nbsp;Yilan Zhang,&nbsp;Xianfeng Liu and Xiaotong Wang,&nbsp;","doi":"10.1021/acs.energyfuels.4c0389710.1021/acs.energyfuels.4c03897","DOIUrl":"https://doi.org/10.1021/acs.energyfuels.4c03897https://doi.org/10.1021/acs.energyfuels.4c03897","url":null,"abstract":"<p >High-intensity electric shock (HES) is a new type of fracturing technology that uses electrical energy as a driver. Self-developed ultrahigh-power HES equipment is used to fracture rocks, which is to study the fracturing mechanism of HES. Strain curves of rock fracture processes and ultradeep field images of rock sections are used to analyze the force characteristics and fracturing process of rocks. The rock fracture process is subjected to intense strains with values exceeding 100,000. The generation of strains is related to tensile and shear stresses. The rock section mainly exhibits a tensile section texture. The main cause of rock fracture is the extension of fractures due to the destruction of grain boundaries and intergranular structures. The significance of the above findings is a clearer explanation of the rock-breaking mechanism of the HES.</p>","PeriodicalId":35,"journal":{"name":"Energy & Fuels","volume":"38 24","pages":"23348–23357 23348–23357"},"PeriodicalIF":5.2,"publicationDate":"2024-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142842547","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Microscale Changes in Residual Oil under Low Salinity Water Flooding in Offshore Sandstone Reservoirs Using X-ray Technology","authors":"Xiaochen Zhang,&nbsp;Lei Tang*,&nbsp;Ke Chen,&nbsp;Mengdong Yao,&nbsp;Liangshuai Ma,&nbsp;Xiaowen Liu,&nbsp;Yan Li,&nbsp;Xuecheng Zheng,&nbsp;Kai Wei and Wei Shi*,&nbsp;","doi":"10.1021/acs.energyfuels.4c0442610.1021/acs.energyfuels.4c04426","DOIUrl":"https://doi.org/10.1021/acs.energyfuels.4c04426https://doi.org/10.1021/acs.energyfuels.4c04426","url":null,"abstract":"<p >Low salinity water flooding is an effective enhanced oil recovery (EOR) method for offshore sandstone reservoirs, but conventional core flooding struggles to capture the microscopic distribution of residual oil. This study focuses on a sandstone reservoir from the Bohai Oilfield, utilizing X-ray computed tomography (X-CT) to perform in situ scans on core samples under 10 conditions. A 3D model of pore structures and fluid distribution was constructed to classify and quantify residual oil. Changes in oil and water saturation, interfacial tension and pH values were tracked by segmenting pore spaces across varying pore volume (PV) of injected fluid. The results demonstrate that low salinity water flooding significantly enhances crude oil recovery. Oil saturation decreases markedly with increasing PV, although recovery slows beyond 70 PV, ultimately reaching an efficiency of 66.05% at 1000 PV. Furthermore, a detailed analysis of residual oil distribution revealed the proportions of various oil clusters and their positioning within pore spaces. Pores with radii between 10–25 μm, particularly those containing network-type residual oil, were found to be the most mobilizable. This study provides crucial insights into the behavior of residual oil during low salinity water flooding and offers guidance for the optimization of flooding strategies in high water-cut oilfields.</p>","PeriodicalId":35,"journal":{"name":"Energy & Fuels","volume":"38 24","pages":"23664–23676 23664–23676"},"PeriodicalIF":5.2,"publicationDate":"2024-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142849946","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}