High-fidelity reservoir simulations of enhanced gas recovery with supercritical CO2

Patel, M, May, E and Johns, M 2016, 'High-fidelity reservoir simulations of enhanced gas recovery with supercritical CO2', Energy, vol. 111, pp. 548-559.


Document type: Journal Article
Collection: Journal Articles

Title High-fidelity reservoir simulations of enhanced gas recovery with supercritical CO2
Author(s) Patel, M
May, E
Johns, M
Year 2016
Journal name Energy
Volume number 111
Start page 548
End page 559
Total pages 12
Publisher Elsevier Ltd
Abstract EGR (Enhanced natural gas recovery) with CO2sequestration offers the prospect of significant environmental and economic benefits by increasing gas recovery while simultaneously sequestering the greenhouse gas. Field-scale deployment is currently limited as the risks of contamination of the produced gas by injected CO2are poorly understood. Reservoir simulations offer a method to quantify the risk but only if sufficiently accurate. For the first time, finite element simulations are presented for several EGR scenarios that incorporate the most accurate models available for fluid mixture and rock properties. Specifically, the GERG-2008 EOS (equation of state) is utilised to describe the supercritical fluid mixture's density, as are reference correlations linked to the most accurate experimental data available for diffusivity and viscosity. Realistic values for rock dispersivity and tortuosity determined from high-accuracy core-flooding and NMR (nuclear magnetic resonance) experiments were also integrated. The relative impacts of these properties were investigated for a benchmark layered reservoir with a quarter 5-spot well pattern. Recovery efficiency at different CO2injection rates was also investigated and was determined to be the dominant consideration: a 100-fold rate increase improved recovery from 53% to 69% while CO2breakthrough time decreased by less than expected. Collectively, these results emphasise the importance of accurate reservoir simulations for EGR.
Subject Numerical Solution of Differential and Integral Equations
Natural Resource Management
Petroleum and Reservoir Engineering
Keyword(s) Carbon dioxide
Dispersion
Enhanced gas recovery
Reservoir simulation
Sequestration
Tortuosity
DOI - identifier 10.1016/j.energy.2016.04.120
Copyright notice © 2016 Elsevier Ltd. All rights reserved.
ISSN 0360-5442
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