Spatial zonation limits magnesite dissolution in porous media

Li, Li; Salehikhoo, F.; Brantley, Susan L.; Heidari, Peyman

doi:10.1016/j.gca.2013.10.051

Cited by 72 publications

(88 citation statements)

References 106 publications

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“…reactions [Brunet et al, 2013;Li et al, 2014;Singha et al, 2011;Surasani et al, 2013;Vilc aez et al, 2013]. The code solves mass, energy, and momentum conservation equations.…”

Section: 1002/2014wr016162mentioning

confidence: 99%

“…When comparing 2-D simulation results with the measured effluent data from the 3-D core sample, the spatial variation of cement/fracture property needs to be taken into account [Li et al, 2014]. The average effluent concentration was estimated using flow rate weighted-average local concentrations of individual grid blocks from the outlet.…”

Section: 1002/2014wr016162mentioning

confidence: 99%

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Self‐healing of cement fractures under dynamic flow of CO₂‐rich brine

Cao

Karpyn

2015

Water Resources Research

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Fractures and defects in wellbore cement can lead to increased possibilities of CO 2 leakage from abandoned wells during geological carbon sequestration. To investigate the physicochemical response of defective wellbore cement to CO 2 -rich brine, we carried out a reactive flow-through experiment using an artificially fractured cement sample at a length of 224.8 mm. A brine solution with dissolved CO 2 at a pH of approximately 3.9 was injected through the sample at a constant rate of 0.0083 cm 3 /s. Surface optical profilometry analysis and 3-D X-ray microtomography imaging confirmed fracture closure and selfhealing behavior consistent with the measured permeability decrease. Visual inspection of the reacted fracture surface showed the development of reactive patterns mapping the flow velocity field inside the fracture, as well as restricted flow toward the sample outlet. The postexperiment permeability of the core sample was measured at half of its initial permeability. A reactive transport model was developed with parameters derived from the experiment to further examine property evolution of fractured cement under dynamic flow of CO 2 -rich brine. Sensitivity analysis showed that residence time and the size of initial fracture aperture are the key factors controlling the tendency to self-healing or fracture opening behavior and therefore determine the long-term integrity of the wellbore cement. Longer residence time and small apertures promote mineral precipitation, fracture closure, and therefore flow restriction. This work also suggests a narrow threshold separating the fracture opening and self-sealing behavior.

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“…reactions [Brunet et al, 2013;Li et al, 2014;Singha et al, 2011;Surasani et al, 2013;Vilc aez et al, 2013]. The code solves mass, energy, and momentum conservation equations.…”

Section: 1002/2014wr016162mentioning

confidence: 99%

Section: 1002/2014wr016162mentioning

confidence: 99%

Self‐healing of cement fractures under dynamic flow of CO₂‐rich brine

Cao

Karpyn

2015

Water Resources Research

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“…These reactive processes are dependent on pore structure (physical heterogeneity) and rock mineralogy (chemical heterogeneity). Although in single‐mineral rock it has been observed that initial pore structure and fluid/solid reactivity play a part in dictating the type of dissolution that will take place (Al‐Khulaifi et al, , ; Li et al, ; Menke et al, ), the more complex physicochemical couplings in chemically heterogeneous media are not fully understood. Hence, investigating the impact of physical and chemical heterogeneity at different flow rates in chemically heterogeneous rock is the main goal of our study.…”

Section: Introductionmentioning

confidence: 99%

Pore‐Scale Dissolution by CO₂ Saturated Brine in a Multimineral Carbonate at Reservoir Conditions: Impact of Physical and Chemical Heterogeneity

Al‐Khulaifi

Lin

Blunt

et al. 2019

Water Resources Research

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We study the impact of physical and chemical heterogeneity on reaction rates in multimineral porous media. We selected two pairs of carbonate samples of different physical heterogeneity in accordance with their initial computed velocity distributions and then injected CO2 saturated brine at reservoir conditions at two flow rates. We periodically imaged the samples using X‐ray microtomography. The mineralogical composition was similar (a ratio of dolomite to calcite of 8:1), but the intrinsic reaction rates and mineral spatial distribution were profoundly different. Visualizations of velocity fields and reacted mineral distributions revealed that a dominant flow channel formed in all cases. The more physically homogeneous samples had a narrower velocity distribution and more preexisting fast channels, which promoted dominant channel formation in their proximity. In contrast, the heterogeneous samples exhibit a broader distribution of velocities and fewer fast channels, which accentuated nonuniform calcite distribution and favored calcite dissolution away from the initially fast pathways. We quantify the impact of physical and chemical heterogeneity by computing the proximity of reacted minerals to the fast flow pathways. The average reaction rates were an order of magnitude lower than the intrinsic ones due to mass transfer limitations. The effective reaction rate of calcite decreased by an order of magnitude, in both fast channels and slow regions. After channel formation calcite was shielded by dolomite whose effective rate in slow regions could even increase. Overall, the preferential channeling effect, as opposed to uniform dissolution, was promoted by a higher degree of physical and/or chemical heterogeneity.

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“…Future research will likely address reactive transport and more complex biogeochemical systems. Further development of the LUC method will include: (1) transport with sorption and biodegradation of organic contaminants (including pesticides, pharmaceuticals, and micropollutants) in macroporous geologic formations (Rosenbom et al 2014;Yu et al 2018); (2) flow and transport in macropores and fractured media under unsaturated conditions (Mortensen et al 2004); (3) transport of inorganic contaminants and colloids (McKay et al 1993;Cohen and Weisbrod 2018;James et al 2018); (4) transport of major cations and anions with electrostatic interactions within the pore water and at the solid/solution interface (Rolle et al 2013b;Muniruzzaman et al 2014); (5) flow and transport of immiscible phases such as chlorinated solvents (Pankow and Cherry 1996;O'Hara et al 2000); (6) impact of chemical and combined physico-chemical heterogeneity (Li et al 2014;Fakhreddine et al 2016;Battistel et al 2018), and (7) microbial metabolism with gas production and determination of efflux gases (Sihota et al 2018). Experimental advances in the LUC setup will also be paralleled by numerical model development.…”

Section: Discussionmentioning

confidence: 99%

A Large Undisturbed Column Method to Study Flow and Transport in Macropores and Fractured Media

Jørgensen¹,

Mosthaf

Rolle

2019

Groundwater

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Intact soil columns can bridge the gap between field studies and idealized laboratory investigations of flow and transport in macropores and fractured media. However, the value of intact column studies is often hampered by shortcomings such as lack of column intactness, small column size, and column rim flow, which can cause serious artifacts and hamper system understanding. The flexible‐wall pressurized large undisturbed column (LUC) method overcomes these limitations and is a valuable approach to analyze fluid flow and solute transport in macroporous and fractured geological formations. The method investigates subsurface processes in complex media, mimicking in situ conditions and facilitating the control of system boundary conditions including effective stress. In recent years, considerable experience has been gained through different applications of the LUC approach. Modeling tools have also been developed for a detailed interpretation of flow and transport processes in LUC systems. This paper describes the steps of the LUC method from column excavation in the field to experimental setup in the laboratory. The description encompasses the key features of the sampling of LUCs in field excavations, the laboratory setup, the procedure for hydraulic and transport experiments, as well as practical challenges and potential issues during operation of an LUC system. Application examples with a fully three‐dimensional numerical model of LUC tracer experiments are also presented to illustrate the quantitative interpretation of transport processes in macroporous clayey tills.

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Spatial zonation limits magnesite dissolution in porous media

Cited by 72 publications

References 106 publications

Self‐healing of cement fractures under dynamic flow of CO₂‐rich brine

Self‐healing of cement fractures under dynamic flow of CO₂‐rich brine

Pore‐Scale Dissolution by CO₂ Saturated Brine in a Multimineral Carbonate at Reservoir Conditions: Impact of Physical and Chemical Heterogeneity

A Large Undisturbed Column Method to Study Flow and Transport in Macropores and Fractured Media

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Spatial zonation limits magnesite dissolution in porous media

Cited by 72 publications

References 106 publications

Self‐healing of cement fractures under dynamic flow of CO2‐rich brine

Self‐healing of cement fractures under dynamic flow of CO2‐rich brine

Pore‐Scale Dissolution by CO2 Saturated Brine in a Multimineral Carbonate at Reservoir Conditions: Impact of Physical and Chemical Heterogeneity

A Large Undisturbed Column Method to Study Flow and Transport in Macropores and Fractured Media

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Self‐healing of cement fractures under dynamic flow of CO₂‐rich brine

Self‐healing of cement fractures under dynamic flow of CO₂‐rich brine

Pore‐Scale Dissolution by CO₂ Saturated Brine in a Multimineral Carbonate at Reservoir Conditions: Impact of Physical and Chemical Heterogeneity