Article
Thermodynamics
Quanle Zou, Tiancheng Zhang, Tengfei Ma, Shixiang Tian, Xueqi Jia, Zebiao Jiang
Summary: This study proposes a method of altering the surface wettability of coal seams through the use of a water-based SiO2 nanofluid to overcome the shortcomings of coal seam water injection. The sedimentation characteristics of the nanofluid were evaluated, and it was found that the presence of the nanofluid enhanced the water absorption and wetting properties of the coal seam.
Article
Chemistry, Multidisciplinary
Hu Wen, Jianchi Hao, Li Ma, Xuezhao Zheng
Summary: The study revealed that the process of CO2 replacing CH4 can be divided into different stages, with desorption amount varying with time and temperature, and replacement ratio showing a positive correlation with replacement time. Overall, an increase in CO2 injection pressure would result in higher cumulative displacement ratio.
Article
Energy & Fuels
Cut Aja Fauziah, Ahmed Al-Yaseri, Emad Al-Khdheeawi, Nilesh Kumar Jha, Hussein Rasool Abid, Stefan Iglauer, Christopher Lagat, Ahmed Barifcani
Summary: The study aims to evaluate the wettability of sandstone samples at different pressures and temperatures, before and after CO2 injection. The results show that the contact angles of the sandstone samples increase with pressure, indicating that the sandstones become more CO2-wet after CO2 injection.
Article
Energy & Fuels
Sivachidambaram Sadasivam, Shakil Masum, Min Chen, Kamil Stanczyk, Hywel Thomas
Summary: This study explores the CO2 adsorption-desorption kinetics of bituminous coal under low pressure injection and compares different models to fit the data. The results suggest that bulk pore diffusion, surface interaction, and multilayer adsorption are the rate-determining steps.
Article
Energy & Fuels
Kanyuan Shi, Junqing Chen, Xiongqi Pang, Fujie Jiang, Shasha Hui, Hong Pang, Kuiyou Ma, Qi Cong
Summary: In this study, the effects of temperature, pressure, mineralization, and concentration ratio of CO2 to CH4 on the wettability of shale organic matter were investigated using molecular dynamics. The results showed that the water wettability increased with temperature and CO2 pressure, while it decreased with solution salinity.
JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING
(2022)
Article
Energy & Fuels
Leilei Si, Nan Ding, Jianping Wei, Lianchao Sheng, Lei Wang, Zhiwei Li, Xingming Chen
Summary: Investigation on coal-water contact angle and its microscopic wetting mechanism under different gas environments was conducted. The results showed that the contact angle gradually increased within a certain pressure range. The contact angle increased significantly in the CH4 atmosphere, transitioning the wettability from hydrophilic to hydrophobic. Molecular dynamics simulation revealed that the adsorption capacity of water molecules decreased with increasing gas pressure, resulting in the poor wetting of coal-water due to the gas adsorption layer and competitive adsorption.
Article
Thermodynamics
Chaolin Zhang, Enyuan Wang, Bobo Li, Xiangguo Kong, Jiang Xu, Shoujian Peng, Yuexia Chen
Summary: CO2-ECBM recovery has the triple benefits of recovering clean resources, ensuring coal mine safety, and achieving CO2 geological sequestration. The study reveals that during CO2-ECBM recovery, the reservoir pressure remains high, methane recovery efficiency increases, but CO2 sequestration efficiency decreases with increasing injection pressure. A displacement index is proposed to reflect the synergistic effect of methane recovery and CO2 sequestration, and a dynamic pressure injection mode is suggested to enhance recovery and sequestration efficiency.
Article
Energy & Fuels
Rukuan Chai, Yuetian Liu, Jingru Wang, Qianjun Liu, Zhenhua Rui
Summary: This study proposed a novel CO2 utilization and sequestration technology, CO2 electrochemical reduction-enhanced oil recovery (CO2RR-EOR), and investigated its effects and mechanisms. The results showed that CO2RR significantly enhanced CO2 sequestration and oil recovery, and altered the CO2-crude oil-brine-rock interaction.
Article
Energy & Fuels
Auby Baban, Alireza Keshavarz, Robert Amin, Stefan Iglauer
Summary: Oil reservoirs with hydrophobic surfaces have a significant impact on flow functions at the macro-scale. However, quantitative measurement of CO2 in oil-wet formations remains challenging due to inconsistent experimental data and uncertainties in predicting wettability. In this study, NMR technology was used to measure and analyze the wettability indices in an oil-wet San Saba, providing comprehensive data on the effect of pore-scale properties on flow functions. These findings contribute to the implementation of carbon capture and storage (CCS) and enhanced oil recovery (EOR) projects in oil-wet reservoirs.
Article
Geochemistry & Geophysics
Renxia Jiang, Hongguan Yu
Summary: Supercritical CO2 (Sc-CO2) extraction from coal results in the extraction of hydrocarbons, oxygen-containing compounds, and sulfur-containing compounds. The main components are hydrocarbons, specifically acyclic alkanes and alkenes. Oxygen-containing compounds include esters and carboxylic acids, while sulfur-containing compounds are present in low concentrations. Extraction becomes more difficult with higher coal ranks.
Article
Energy & Fuels
Qin Guowei, Liu Qingping, Zhang Beilei, Sun Saisai, Zheng Yanzhao, Qin Wenlong, Wu Mei
Summary: This paper proposed the use of nanofluid for drainage gas recovery in tight gas reservoir development and systematically investigated its effects on gas-water flow and core surface properties through experiments. The results showed that nanofluid significantly increased water relative permeability, reduced irreducible water saturation, and slightly decreased gas relative permeability, demonstrating significant drainage effects.
PETROLEUM SCIENCE AND TECHNOLOGY
(2022)
Article
Thermodynamics
Gang Bai, Jun Su, Xueming Li, Chunsheng Guo, Mingxu Han, Xihua Zhou, Chaojun Fan
Summary: The study proposes an SBS-CO2 method that gradually increases the CO2 injection pressure, which can improve the total recovery rate of methane and reduce the risk of CO2 consumption and outburst compared to the traditional constant CO2 injection pressure method.
Article
Energy & Fuels
Jinsheng Wang, Hanin Samara, Philip Jaeger, Vivien Ko, Dustin Rodgers, David Ryan
Summary: This study evaluates CO2 adsorption under pressure and temperature conditions for geological storage in two non-shale reservoirs in Canada. The results show that CO2 adsorption can substantially increase storage capacity and decrease leaking potential by reducing overpressure in the reservoir caprock. The adsorption behaviors of rocks from different reservoirs are distinct, and CO2 can enter small rock pores to enhance adsorption and utilization of reservoir capacity.
Article
Energy & Fuels
Tiancheng Zhang, Quanle Zou, Ke Li, Xueqi Jia, Chengzi Jiang, Xingang Niu
Summary: This study investigated the effect of SiO2 nanofluid concentration on the wettability enhancement of coal. The results showed that increasing the nanofluid concentration can improve the water adsorption capacity and wettability of coal. Furthermore, the wettability-enhancing effect of the nanofluid weakened with time, but the stability of the effect gradually improved. The 0.5 wt% nanofluid had the best sustainability and stability of the wettability-enhancing effect.
Article
Energy & Fuels
Mirhasan Hosseini, Muhammad Ali, Jalal Fahimpour, Alireza Keshavarz, Stefan Iglauer
Summary: Underground hydrogen storage (UHS) and CO2 geological storage (CGS) are essential for meeting energy demand and reducing greenhouse gases (GHGs). The calcite-fluid interfacial tension (Ycalcite-fluid) is crucial for gas storage in carbonate formations, but there is a lack of Ycalcite-fluid data in the literature. We theoretically calculated Ycalcite-fluid for calcite/H2/water and calcite/CO2/water systems, considering geological parameters like temperature, pressure, organic acid concentration, and salinity. The results showed that Ycalcite-gas decreased with pressure, salinity, and organic acid concentration but increased with temperature. Ycalcite-water slightly increased with organic acid concentration and salinity. Furthermore, Ycalcite-fluid values were higher for the H2/brine system compared to the CO2/brine system. This study provides a better understanding of wetting characteristics and enables further research on H2/CO2 storage in carbonate formations.
Article
Engineering, Chemical
Hoda Javanmard, Mojtaba Seyyedi, Sidsel M. Nielsen
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2018)
Article
Energy & Fuels
Hoda Jayanmard, Mojtaba Seyyedi, Sian A. Jones, Sidsel M. Nielsen
Article
Environmental Sciences
Hoda Javanmard, Anozie Ebigbo, Stuart D. C. Walsh, Martin O. Saar, Daniel Vogler
Summary: The study investigates the relationship between fracture permeability and geometry under normal loads, finding that aperture roughness can increase with applied stresses. By introducing the No-Flow Fraction (NFF) parameter, a new Cubic-law-based permeability model is proposed to significantly improve accuracy in permeability estimations. The new models provide permeability estimates accurate to within a factor of 2 of simulated permeability in majority of deformed fractures, compared to previous models with typical deviations of at least one order of magnitude.
WATER RESOURCES RESEARCH
(2021)
Article
Green & Sustainable Science & Technology
Marina Grimm Lima, Hoda Javanmard, Daniel Vogler, O. Martin Saar, Xiang-Zhao Kong
Summary: Research indicates that injecting scCO2 into fractured reservoirs under high compressive stress reduces the mobility of brine and increases the mobility of scCO2 phase, leading to channeling and decreased brine sweep efficiency. Lowering compressive stress helps to decrease water evaporation.
INTERNATIONAL JOURNAL OF GREENHOUSE GAS CONTROL
(2021)
Article
Water Resources
Hoda Javanmard, Martin O. Saar, Daniel Vogler
Summary: In this study, the heterogeneity of single rough rock fractures is parameterized using connectivity metrics for the first time. The results show that connectivity metrics can predict permeability with higher accuracy. All three studied connectivity metrics provide better permeability estimations when a larger aperture value is chosen as the cutoff threshold. Therefore, using connectivity metrics provides a less expensive alternative to estimate fracture permeability.
ADVANCES IN WATER RESOURCES
(2022)