Injection of CO2-saturated brine in geological reservoir: a way to enhanced storage safety

Revision as of 11:00, 27 March 2020

Abstract

Injection of free-phase supercritical Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://mathoid.scipedia.com/localhost/v1/":): CO_2

into deep geological reservoirs is associated with risk of considerable return flows towards the land surface due to the buoyancy of Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://mathoid.scipedia.com/localhost/v1/":): CO_2

, which is lighter than the resident brine in the reservoir. Such upward movements can be avoided if Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://mathoid.scipedia.com/localhost/v1/":): CO_2

is injected in the dissolved phase (Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://mathoid.scipedia.com/localhost/v1/":): CO_{2aq}

). In this work, injection of Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://mathoid.scipedia.com/localhost/v1/":): CO_2 -saturated brine in a subsurface carbonate reservoir was modelled. Physical and geochemical interactions of injected low-pH Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://mathoid.scipedia.com/localhost/v1/":): CO_2 -saturated brine with the carbonate minerals (calcite, dolomite and siderite) were investigated in the reactive transport modelling. Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://mathoid.scipedia.com/localhost/v1/":): CO_2 -saturated brine, being low in pH, showed high reactivity with the reservoir minerals, resulting in a significant mineral dissolution and Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://mathoid.scipedia.com/localhost/v1/":): CO_2

conversion in reactions. Over the injection period of 10 yr, up to 16% of the injected Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://mathoid.scipedia.com/localhost/v1/":): CO_2
was found consumed in geochemical reactions. Sorption included in the transport analysis resulted in additional quantities of Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://mathoid.scipedia.com/localhost/v1/":): CO_2
mass stored. However, for the considered carbonate minerals, the consumption of injected Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://mathoid.scipedia.com/localhost/v1/":): CO_{2aq}
was found mainly in the form of ionic trapping.

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+Injection of free-phase supercritical <math>CO_2</math> into deep geological reservoirs is associated with risk of considerable return flows towards the land surface due to the buoyancy of <math>CO_2</math>, which is lighter than the resident brine in the reservoir. Such upward movements can be avoided if <math>CO_2</math> is injected in the dissolved phase (<math>CO_{2aq}</math>). In this work, injection of <math>CO_2</math>-saturated brine in a subsurface carbonate reservoir was modelled. Physical and geochemical interactions of injected low-pH <math>CO_2</math>-saturated brine with the carbonate minerals (calcite, dolomite and siderite) were investigated in the reactive transport modelling. <math>CO_2</math>-saturated brine, being low in pH, showed high reactivity with the reservoir minerals, resulting in a significant mineral dissolution and <math>CO_2</math> conversion in reactions. Over the injection period of 10 yr, up to 16% of the injected <math>CO_2</math> was found consumed in geochemical reactions. Sorption included in the transport analysis resulted in additional quantities of <math>CO_2</math> mass stored. However, for the considered carbonate minerals, the consumption of injected <math>CO_{2aq}</math> was found mainly in the form of ionic trapping.
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