The impact of supercritical CO2 on the pore structure and storage capacity of shales

Fatah, Ahmed; Mahmud, Hisham Ben; Bennour, Ziad; Gholami, Raoof; Hossain, Mofazzal

doi:10.1016/j.jngse.2021.104394

Cited by 38 publications

(39 citation statements)

References 53 publications

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“…A range of characterization techniques have been used to characterize the pore structure. , Commonly used fluid intrusion methods include low-pressure N 2 adsorption analysis and mercury intrusion (MICP) analysis, but N 2 adsorption analysis cannot detect closed pores, and mercury injection in MICP may damage the pore throat structure. Typical noninvasive techniques are represented by nuclear magnetic resonance (NMR) , and X-ray diffraction (XRD) techniques, but NMR does not provide pore size distribution, and XRD techniques are more suitable for the qualitative analysis of components without any spatial correlation information. Imaging techniques can describe quantitative information about pore space, such as X-ray computed tomography (X-CT), ,− which can quantify porosity and the pore size distribution, but X-CT can only scan small core samples.…”

Section: Pore Scale Characteristics During Mineralization Storagementioning

confidence: 99%

Review on Multiscale CO₂ Mineralization and Geological Storage: Mechanisms, Characterization, Modeling, Applications and Perspectives

Sun,

Liu,

Cheng

et al. 2023

Energy Fuels

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Carbon capture, utilization, and storage (CCUS) technology has shown rapid development in recent years as an important technology to reduce carbon emissions, of which CO 2 geological storage is an important part. Due to the complexity of CO 2 geological storage, especially the long period of mineralization storage, intensive studies have been conducted to reveal the mechanism of mineralization storage. This review presents a comprehensive understanding of the mineralization storage mechanism and its application prospects by introducing various experimental tools to deepen the characterization of pore-scale and core-scale changes during mineralization storage and promote the application of mineralization storage in large-scale carbon storage studies through geochemical simulations and field-scale demonstrations. This review summarizes representative multiscale studies of mineralization storage in typical reservoirs. The main findings are as follows: (1) For CO 2 −water−rock reactions, in addition to the influence of the inherent inhomogeneity of reservoir rocks (properties of mineral components, etc.), the environmental conditions of the reservoir (pH, temperature, pressure, etc.) have a strong influence on the dissolution and precipitation processes during mineralized storage. (2) The mineralization sealing process is accompanied by a complex evolution of pore-permeability properties. The mineral dissolution stage causes an increase in pore space and significantly improves the fluid injection capacity, while the mineral reprecipitation process causes problems such as pore throat blockage, which often affects the safety of sealing. (3) The modeling approach, combined with laboratory work, allows for large-scale and time-scale predictions. In addition, the current implementation of successful demonstration projects is summarized to promote the use of CO 2 storage in field engineering applications. Finally, directions for future development and research are proposed.

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Section: Pore Scale Characteristics During Mineralization Storagementioning

confidence: 99%

Review on Multiscale CO₂ Mineralization and Geological Storage: Mechanisms, Characterization, Modeling, Applications and Perspectives

Sun,

Liu,

Cheng

et al. 2023

Energy Fuels

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“…Bemani et al (2020) investigated the CO 2 –CH 4 competitive adsorption mechanism in shale using an advanced machine learning tool, considering the pressure, temperature, and TOC. The alteration of the shale pore structure after ScCO 2 treatment is investigated by Fatah et al (2022), and its subsequent influence on CO 2 storage is evaluated. In accordance with the basic isothermal adsorption experiments, CO 2 geological storage potential in coalbed reservoirs is discussed.…”

Section: Introductionmentioning

confidence: 99%

Carbon Dioxide Flow Behavior through Nanopores: Implication for CO₂ Sequestration in Unconventional Gas Reservoirs

Hong-ya²,

Gang

et al. 2022

Ind. Eng. Chem. Res.

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CO 2 sequestration is a promising approach to achieve the net-zero emission across the world, expecting to mitigate the urgent climate change and global warming. In this article, research efforts are dedicated for investigating CO 2 sequestration in unconventional gas reservoirs, characterized with nanoscale pore size and complicated mineral compositions. Unlike the majority of previous research studies focusing on CO 2 adsorption or competition adsorption in nanoconfined space, this article puts emphasis on the CO 2 flow capacity in nanopores under different conditions, including pressure, temperature, pore size, and the wettability effect. CO 2 flow capacity plays a prominent role, affecting the efficiency of CO 2 sequestration, which currently lacks due attention and entails indepth elaboration. In this article, the nanoconfined CO 2 flow mechanism is first studied, and CO 2 physical properties varying from the gaseous state to the supercritical state are incorporated in the proposed model. Furthermore, the adsorption phase thickness and critical pressure/temperature shift induced by CO 2 adsorption are coupled. Results show that (a) CO 2 flow capacity in the 2 nm pore is greater than that in the 5−20 nm pore as a result of dominant surface diffusion in small pores; (b) CO 2 flow capacity at 323 K can reach as much as 1.4 times that at 423 K, and desirable pressure for optimal CO 2 flow capacity is approximately 9 MPa in small nanopores; and (c) the wettability effect can cause as much as 96.3% discrepancy for the CO 2 flow capacity, while the surface− CO 2 contact angle varies from 20 to 160°. This work is able to contribute to CO 2 geological sequestration from the perspective of injection efficiency.

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“…65 The solubility form of trapping is safe and effective for storing CO 2 . 141,156 The solubility trapping mechanism i.e., the chemical trapping of CO 2 as a soluble component in brine is supported by the following eq xi to xiv) 58,65,126,142,151,157,158 Governed by Henry's law:…”

Section: Geological Storage Of Sc-comentioning

confidence: 99%

“…Dolomite interactions with H + ions reduce the number of carbonate minerals (mainly calcite), leading to their reduction. Carbonate mineral dissolution can result in mineral carbonation, a mechanism trapping CO 2 over geological time scales, enhancing CO 2 storage potential. , …”

Section: Geological Storage Of Sc-co2mentioning

confidence: 99%

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Supercritical Carbon Dioxide Utilization for Hydraulic Fracturing of Shale Reservoir, and Geo-Storage: A Review

Gupta,

Verma

2023

Energy Fuels

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Hydraulic fracturing has completely revolutionized how shale resources are exploited to extracthydrocarbons. However, sustainability and environmental issues have fueled the desire for alternate fracturing technologies. Supercritical carbon dioxide (Sc-CO2) fracturing is a new method that uses high-pressure, high-temperature CO2 in its supercritical state (7.38 MPa and 31.1 °C) to generate fractures in shale formations, thereby increasing reservoir permeability. This Review thoroughly analyzes the effects of Sc-CO2 on shale reservoirs during the fracturing process, including the factors that affect fracture breakdown pressure and the complexity and roughness of fracture induced by Sc-CO2. Sc-CO2 can fracture rock at a fracturing pressure lower than that of slick water. CO2, in its supercritical state, shows strong permeability, low viscosity, and extremely low surface tension, like gas, because of which it can infiltrate any space larger than its kinetic diameter (0.330 nm). Many research investigations illustrate how Sc-CO2 affects shales with diverse pore structures, mineral compositions, and mechanical properties when exposed to Sc-CO2 for several hours to days. It is challenging to effectively store CO2 in shale gas reservoirs due to their low permeability and limited storage capacity. To improve the effectiveness of CO2 storage, shale can be fractured to increase the pore space and surface area in reservoirs. Thereby, a certain amount of the CO2 pumped for shale gas production can be securely stored in shale formations, reducing carbon emissions and allowing for a zero-carbon footprint. This paper discusses the pathway and different chemical reactions involved in the storage of CO2 after fracturing over a period. However, fully understanding the interactions between Sc-CO2 and shale rock and the possibility of long-term storage of CO2 in shale formations is quite challenging. It is because of a lack of research and limited knowledge in the above field. Hence, more investigation and development are required in the research area of Sc-CO2 fracturing and the interaction of CO2 with shale rock.

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The impact of supercritical CO2 on the pore structure and storage capacity of shales

Cited by 38 publications

References 53 publications

Review on Multiscale CO₂ Mineralization and Geological Storage: Mechanisms, Characterization, Modeling, Applications and Perspectives

Review on Multiscale CO₂ Mineralization and Geological Storage: Mechanisms, Characterization, Modeling, Applications and Perspectives

Carbon Dioxide Flow Behavior through Nanopores: Implication for CO₂ Sequestration in Unconventional Gas Reservoirs

Supercritical Carbon Dioxide Utilization for Hydraulic Fracturing of Shale Reservoir, and Geo-Storage: A Review

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The impact of supercritical CO2 on the pore structure and storage capacity of shales

Cited by 38 publications

References 53 publications

Review on Multiscale CO2 Mineralization and Geological Storage: Mechanisms, Characterization, Modeling, Applications and Perspectives

Review on Multiscale CO2 Mineralization and Geological Storage: Mechanisms, Characterization, Modeling, Applications and Perspectives

Carbon Dioxide Flow Behavior through Nanopores: Implication for CO2 Sequestration in Unconventional Gas Reservoirs

Supercritical Carbon Dioxide Utilization for Hydraulic Fracturing of Shale Reservoir, and Geo-Storage: A Review

Contact Info

Product

Resources

About

Review on Multiscale CO₂ Mineralization and Geological Storage: Mechanisms, Characterization, Modeling, Applications and Perspectives

Review on Multiscale CO₂ Mineralization and Geological Storage: Mechanisms, Characterization, Modeling, Applications and Perspectives

Carbon Dioxide Flow Behavior through Nanopores: Implication for CO₂ Sequestration in Unconventional Gas Reservoirs