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Transport properties of saline CO2 storage reservoirs with unconnected fractures from brine-CO2 flow-through tests

Transport properties of saline CO2 storage reservoirs with unconnected fractures from brine-CO2 flow-through tests
Transport properties of saline CO2 storage reservoirs with unconnected fractures from brine-CO2 flow-through tests
CO2 storage in fractured reservoirs may lead to fast CO2 flow through interconnected fracture networks; but the role of isolated fractures on brine-CO2 multiphase flow systems remains unclear. We present the results of a brine-CO2 flow-through experiment in which we assess the change in transport properties of a synthetic sandstone plug (a surrogate of a saline siliciclastic CO2 reservoir) containing non-connected fractures aligned 45° from its axis. The test was performed at 40 MPa of constant hydrostatic confining pressure and ~11 MPa of pore pressure, at room temperature (~19.5 °C), using pure liquid-CO2 and 35 g L−1 NaCl salt solution. The injected CO2-brine volume fraction was increased from 0 to 1 in 0.2 units-steps (drainage). Upon achievement of the maximum CO2 saturation (SCO2 ~0.6), the plug was flushed-back with the original brine (imbibition). During the test, we monitored simultaneously pore pressure, temperature, axial and radial strains, and bulk electrical resistivity. The fractured sample showed lower values of cross- and end-points in the relative permeability curves to CO2 compared to non-fractured samples, from comparable experiments performed at similar pressure and brine salinity conditions, but different temperature. Our results suggest that a non-connected fracture network affects the mobility of the individual phases, favouring the trapping of CO2 in the porous medium and improving the storage efficiency of the reservoir. These evidences show the need of a better understanding of fracture connectivity prior to discard fractured reservoirs as unsuitable geological formations for CO2 storage.
0920-4105
Muñoz-Ibáñez, Andrea
08f3d9cf-525f-4621-a3b0-59f67baaa2ca
Falcon-Suarez, Ismael Himar
9e8022b5-8799-4326-8d5b-0ed46de3b25a
Marín-Moreno, Héctor
e3eb9576-bca1-4d35-9512-e1bb88b0e4a6
Delgado-Martín, Jordi
72c84350-653a-4cc2-9715-d32515a7558b
Mackin, Peter
2d04ace8-fe53-48eb-9bf2-e27dc1229369
Muñoz-Ibáñez, Andrea
08f3d9cf-525f-4621-a3b0-59f67baaa2ca
Falcon-Suarez, Ismael Himar
9e8022b5-8799-4326-8d5b-0ed46de3b25a
Marín-Moreno, Héctor
e3eb9576-bca1-4d35-9512-e1bb88b0e4a6
Delgado-Martín, Jordi
72c84350-653a-4cc2-9715-d32515a7558b
Mackin, Peter
2d04ace8-fe53-48eb-9bf2-e27dc1229369

Muñoz-Ibáñez, Andrea, Falcon-Suarez, Ismael Himar, Marín-Moreno, Héctor, Delgado-Martín, Jordi and Mackin, Peter (2019) Transport properties of saline CO2 storage reservoirs with unconnected fractures from brine-CO2 flow-through tests. Journal of Petroleum Science and Engineering, [106551]. (doi:10.1016/j.petrol.2019.106551).

Record type: Article

Abstract

CO2 storage in fractured reservoirs may lead to fast CO2 flow through interconnected fracture networks; but the role of isolated fractures on brine-CO2 multiphase flow systems remains unclear. We present the results of a brine-CO2 flow-through experiment in which we assess the change in transport properties of a synthetic sandstone plug (a surrogate of a saline siliciclastic CO2 reservoir) containing non-connected fractures aligned 45° from its axis. The test was performed at 40 MPa of constant hydrostatic confining pressure and ~11 MPa of pore pressure, at room temperature (~19.5 °C), using pure liquid-CO2 and 35 g L−1 NaCl salt solution. The injected CO2-brine volume fraction was increased from 0 to 1 in 0.2 units-steps (drainage). Upon achievement of the maximum CO2 saturation (SCO2 ~0.6), the plug was flushed-back with the original brine (imbibition). During the test, we monitored simultaneously pore pressure, temperature, axial and radial strains, and bulk electrical resistivity. The fractured sample showed lower values of cross- and end-points in the relative permeability curves to CO2 compared to non-fractured samples, from comparable experiments performed at similar pressure and brine salinity conditions, but different temperature. Our results suggest that a non-connected fracture network affects the mobility of the individual phases, favouring the trapping of CO2 in the porous medium and improving the storage efficiency of the reservoir. These evidences show the need of a better understanding of fracture connectivity prior to discard fractured reservoirs as unsuitable geological formations for CO2 storage.

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Munoz_Ibanez_etal_19_JPSE_Manuscript_accepted - Accepted Manuscript
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Accepted/In Press date: 30 September 2019
e-pub ahead of print date: 1 October 2019

Identifiers

Local EPrints ID: 436066
URI: http://eprints.soton.ac.uk/id/eprint/436066
ISSN: 0920-4105
PURE UUID: 1a1c04f0-a7fc-4ccf-bde2-56cd6bcefd4d

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Date deposited: 27 Nov 2019 17:30
Last modified: 22 Nov 2021 07:51

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Contributors

Author: Andrea Muñoz-Ibáñez
Author: Ismael Himar Falcon-Suarez
Author: Héctor Marín-Moreno
Author: Jordi Delgado-Martín
Author: Peter Mackin

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