Experimental study of CO2–brine–rock interaction during CO2 sequestration in deep coal seams

Wang, Kairan; Xu, Tianfu; Wang, Fugang; Tian, Hailong

doi:10.1016/j.coal.2016.01.010

Cited by 77 publications

(20 citation statements)

References 53 publications

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“…The dissolved CO 2 reacts with minerals in coal and coal gangue directly or indirectly. Dissolution and precipitation of minerals can occur in this process, leading to a change in porosity, permeability, and pore structure of the coal . In turn, the gas adsorption capacity of the coal is affected, which is a crucial mechanism in CO 2 ‐ECBM processes.…”

Section: Introductionmentioning

confidence: 99%

“…Dissolution and precipitation of minerals can occur in this process, leading to a change in porosity, permeability, and pore structure of the coal. [37][38][39] In turn, the gas adsorption capacity of the coal is affected, which is a crucial mechanism in CO 2 -ECBM processes. So far, only a few researchers have conducted the related studies on supercritical CO 2 -H 2 O-coal coexistent systems under in situ conditions.…”

Section: Introductionmentioning

confidence: 99%

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Experimental study of physical‐chemical properties modification of coal after CO₂ sequestration in deep unmineable coal seams

Zhao

Wang

et al. 2018

Greenhouse Gases

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An initial investigation into the impacts of CO2 storage in unmineable coal seams, with or without enhanced coal‐bed methane recovery (CO2‐ECBM), was conducted, focusing on changes in the chemical and physical properties of coal. A high metamorphic grade anthracite was obtained from Qinshui Basin in China. Powdered coal was reacted with deionized water and carbon dioxide at temperatures of 25–35 °C and pressures of 5–11 MPa, in seven custom‐built batch reactors – conditions similar to the in situ formation conditions for the coal samples. An experiment with N2 saturated‐water to compare CO2‐free‐water mobilization with CO2‐water was also performed. It was observed that the supercritical CO2‐H2O‐coal reaction had a more significant influence on the micropores than mesopores. The micropore increase was reflected directly in the specific surface area and pore volume, which increased sharply. The true density also increased accordingly. The changes to the pore structure in the coal may affect the storage capacity of CO2 and can modify the fluid flow pattern in the process of CO2‐ECBM. Meanwhile, after exposing the coal samples to supercritical CO2, most of the trace‐element content in the reaction solutions was very low; only the Se and Mn content was beyond acceptable drinking water quality, but not enough to produce a serious influence on shallow aquifers. Nonetheless, the potential for mobilizing toxic trace elements from the coalbed is an important factor to be considered when evaluating CO2 sequestration in deep unmineable coal seams. © 2018 Society of Chemical Industry and John Wiley & Sons, Ltd.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental study of physical‐chemical properties modification of coal after CO₂ sequestration in deep unmineable coal seams

Zhao

Wang

et al. 2018

Greenhouse Gases

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“…They carried out batch experiments of the caprock in brine at 200°C and 300 bar to test the extent of fluid-rock reactions. The results showed minor dissolution of anhydrite and K-feldspar, and precipitation (pore-filling and pore-bridging) of clay minerals (smectite and/or illite) and siderite in the vicinity of pyrite.The CO2-brine-rock interaction in deep coal seams was numerically and experimentally studied by Wang et al[217]. Their leachate chemistry analysis showed significant mobilisation of major elements because of dissolution of silicate and carbonate minerals in the coal measure strata.…”

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confidence: 99%

A review of developments in carbon dioxide storage

et al. 2017

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Carbon capture and storage (CCS) has been identified as an urgent, strategic and essential approach to reduce anthropogenic CO2 emissions, and mitigate the severe consequences of climate change. CO2 storage is the last step in the CCS chain and can be implemented mainly through oceanic and underground geological sequestration, and mineral carbonation. This review paper aims to provide state-of-the-art developments in CO2 storage. The review initially discussed the potential options for CO2 storage by highlighting the present status, current challenges and uncertainties associated with further deployment of established approaches (such as storage in saline aquifers and depleted oil and gas reservoirs) and feasibility demonstration of relatively newer storage concepts (such as hydrate storage and CO2-based enhanced geothermal systems). The second part of the review outlined the critical criteria that are necessary for storage site selection, including geological, geothermal, geohazards, hydrodynamic, basin maturity, and economic, societal and environmental factors. In the third section, the focus was on identification of CO2 behaviour within the reservoir during and after injection, namely injection-induced seismicity, potential leakage pathways, and long-term containment complexities associated with CO2-brine-rock interaction. In addition, a detailed review on storage capacity estimation methods based on different geological media and trapping mechanisms was provided. Finally, an overview of major CO2 storage projects, including their overall outcomes, were outlined. This review indicates that although CO2 storage is a technically proven strategy, the discussed challenges need to be addressed in order to accelerate the deployment of the technology. In addition, beside the necessity of technoeconomic aspects, public acceptance of CO2 storage plays a central role in technology deployment, and the current ethical mechanisms need to be further improved.

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“…Once achieving to the adequate amount, these substances can be brought into the surrounding geological coal seams and groundwater, which may be detrimental to ES & H for humans (White et al, 2005). On the other hand, under the condition of CO 2 geologic sequestration, SC-CO 2 fluids may tend to migrate around the target reservoir, leading to accumulation under the cap rock (Wang et al, 2016). It is well known that the sealing ability of the cap rock is the key to safety storage of CO 2 (Zhang et al, 2009).…”

Section: How Sc-co 2 Affects Long-term Sequestrationmentioning

confidence: 99%

Influence of supercritical CO2 on pore structure and functional groups of coal: Implications for CO2 sequestration

Zhang

Wang

et al. 2017

Journal of Natural Gas Science and Engineering

101

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To better understand the effects of CO 2 sequestration and long-term storage, it is worth studying the interactions between supercritical CO 2 (SC-CO 2) and coal, and its influence on coal properties or, more specifically, the changes in coal pore structure and functional groups caused by SC-CO 2. In this study, three different metamorphic grades of coal were sampled and exposed to SC-CO 2 (~40 °C and 10 MPa) for 120 hr through a geochemical reactor, simulating CO 2 storage in deep coal seams. The functional groups and pore structure of different coal ranks before and after SC-CO 2 treatment were measured by Fourier Transform Infrared Spectroscopy (FTIR), Mercury Intrusion Porosimetry (MIP) and physical adsorption method. The results show that the absorption peak intensity of-OH groups, with intramolecular association and C-H stretching vibrations, clearly changed for anthracite compared to others. Compounds with weakly polar functional groups, such as hydrocarbons, epoxy and lipid compounds (ether or ester), decreased significantly, whereas strongly polar functional groups exhibited only a slight change. Pore structure and distribution of each pore phase showed the diversity present in different coal ranks. The development of seepage-flow pores (mesopore and macropore) was promoted by SC-CO 2. For high rank and medium rank coals, the degree of pore development was significantly altered by SC-CO 2 , while pore development in low rank coal was largely unaltered. The results of this study contribute to the understanding of coal structure evolution and its effects on coal reservoir during long-term geological sequestration.

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Experimental study of CO2–brine–rock interaction during CO2 sequestration in deep coal seams

Cited by 77 publications

References 53 publications

Experimental study of physical‐chemical properties modification of coal after CO₂ sequestration in deep unmineable coal seams

Experimental study of physical‐chemical properties modification of coal after CO₂ sequestration in deep unmineable coal seams

A review of developments in carbon dioxide storage

Influence of supercritical CO2 on pore structure and functional groups of coal: Implications for CO2 sequestration

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Experimental study of CO2–brine–rock interaction during CO2 sequestration in deep coal seams

Cited by 77 publications

References 53 publications

Experimental study of physical‐chemical properties modification of coal after CO2 sequestration in deep unmineable coal seams

Experimental study of physical‐chemical properties modification of coal after CO2 sequestration in deep unmineable coal seams

A review of developments in carbon dioxide storage

Influence of supercritical CO2 on pore structure and functional groups of coal: Implications for CO2 sequestration

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Experimental study of physical‐chemical properties modification of coal after CO₂ sequestration in deep unmineable coal seams

Experimental study of physical‐chemical properties modification of coal after CO₂ sequestration in deep unmineable coal seams