Analytical solution for estimating storage efficiency of geologic sequestration of CO2

During injection of carbon dioxide (CO2) into deep saline aquifers, the available pore volume of the aquifer may be used inefficiently, thereby decreasing the effective capacity of the repository for CO2 storage. Storage efficiency is the fraction of the available pore space th... Full description

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doi: 10.1016/j.ijggc.2009.11.002
Authors:Okwen, R.T.; Stewart, M.T.; Cunningham, J.A.
Volume Title:International Journal of Greenhouse Gas Control
Source:International Journal of Greenhouse Gas Control, 4(1), p.102-107. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 1750-5836
Publication Date:2010
Note:In English. 32 refs.; illus., incl. 1 table
Subjects:Aquifers; Brines; Buoyancy; Carbon dioxide; Carbon sequestration; Computer programs; Data processing; Gas injection; Ground water; Mathematical models; Permeability; Porosity; Salinity; Simulation; Temperature; Saline aquifers; Storage capacity
Record ID:2020024159
Copyright Information:GeoRef, Copyright 2020 American Geosciences Institute.
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040 |a ViAlAGI  |c ViAlAGI 
072 7 |a 22  |2 georeft 
100 1 |a Okwen, R.T.  |u University of South Florida, Department of Civil and Environmental Engineering, Tampa, FL 
245 1 0 |a Analytical solution for estimating storage efficiency of geologic sequestration of CO<2` 
300 |a p. 102-107 
500 |a In English. 32 refs. 
500 |a Key title: International Journal of Greenhouse Gas Control 
500 |a Source note: International Journal of Greenhouse Gas Control, 4(1), p.102-107. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 1750-5836 
500 |a Publication type: journal article 
500 |a Carbon note: Seminal Paper 
504 |b 32 refs. 
510 3 |a GeoRef, Copyright 2020 American Geosciences Institute. 
520 |a During injection of carbon dioxide (CO<2`) into deep saline aquifers, the available pore volume of the aquifer may be used inefficiently, thereby decreasing the effective capacity of the repository for CO<2` storage. Storage efficiency is the fraction of the available pore space that is utilized for CO<2` storage, or, in other words, it is the ratio between the volume of stored CO<2` and the maximum available pore volume. In this note, we derive and present simple analytical expressions for estimating CO<2` storage efficiency under the scenario of a constant-rate injection of CO<2` into a confined, homogeneous, isotropic, saline aquifer. The expressions for storage efficiency are derived from models developed previously by other researchers describing the shape of the CO<2`-brine interface. The storage efficiency of CO<2` is found to depend on three dimensionless groups, namely: (1) the residual saturation of brine after displacement by CO<2`; (2) the ratio of CO<2` mobility to brine mobility; (3) a dimensionless group (which we call a "gravity factor") that quantifies the importance of CO<2` buoyancy relative to CO<2` injection rate. In the particular case of negligible residual brine saturation and negligible buoyancy effects, the storage efficiency is approximately equal to the ratio of the CO<2` viscosity to the brine viscosity. Storage efficiency decreases as the gravity factor increases, because the buoyancy of the CO<2` causes it to occupy a thin layer at the top of the confined formation, while leaving the lower part of the aquifer under-utilized. Estimates of storage efficiency from our simple analytical expressions are in reasonable agreement with values calculated from simulations performed with more complicated multi-phase-flow simulation software. Therefore, we suggest that the analytical expressions presented herein could be used as a simple and rapid tool to screen the technical or economic feasibility of a proposed CO<2` injection scenario. 2009 Elsevier Ltd. All rights reserved. 
650 7 |a Aquifers  |2 georeft 
650 7 |a Brines  |2 georeft 
650 7 |a Buoyancy  |2 georeft 
650 7 |a Carbon dioxide  |2 georeft 
650 7 |a Carbon sequestration  |2 georeft 
650 7 |a Computer programs  |2 georeft 
650 7 |a Data processing  |2 georeft 
650 7 |a Gas injection  |2 georeft 
650 7 |a Ground water  |2 georeft 
650 7 |a Mathematical models  |2 georeft 
650 7 |a Permeability  |2 georeft 
650 7 |a Porosity  |2 georeft 
650 7 |a Salinity  |2 georeft 
650 7 |a Simulation  |2 georeft 
650 7 |a Temperature  |2 georeft 
653 |a Saline aquifers 
653 |a Storage capacity 
700 1 |a Stewart, M.T. 
700 1 |a Cunningham, J.A. 
773 0 |t International Journal of Greenhouse Gas Control  |d Amsterdam : Elsevier, Jan. 2010  |x 1750-5836  |n International Journal of Greenhouse Gas Control, 4(1), p.102-107. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 1750-5836  |g Vol. 4, no. 1  |h illus., incl. 1 table 
856 |u urn:doi: 10.1016/j.ijggc.2009.11.002