Inclusion of connate water in enhanced gas recovery reservoir simulations

Patel, M, May, E and Johns, M 2017, 'Inclusion of connate water in enhanced gas recovery reservoir simulations', Energy, vol. 141, pp. 757-769.


Document type: Journal Article
Collection: Journal Articles

Title Inclusion of connate water in enhanced gas recovery reservoir simulations
Author(s) Patel, M
May, E
Johns, M
Year 2017
Journal name Energy
Volume number 141
Start page 757
End page 769
Total pages 13
Publisher Elsevier Ltd
Abstract Enhanced natural gas recovery (EGR) with supercritical (sc)CO2sequestration offers the prospect of increased natural gas recovery. High-fidelity reservoir simulations offer a method to quantify the risk of contamination of produced gas by the injected scCO2. Simulations of scCO2mixing with the reservoir gas have been reported; however the effects of connate water on EGR have not been effectively explored. We extend a prior EGR simulation tool (Patel, May and Johns, 2016; Ref. [1]) to incorporate connate water accounting for its effect on dispersivity and permeability; chemical equilibrium is modelled using a novel, computationally efficient Lagrange multiplier-based approach. The code is applied to a 'quarter five-spot' benchmark scenario. The inclusion of connate water generally resulted in a reduction in breakthrough time and a decrease in methane recovery. The connate water's largest effect was to change the scCO2flow field, which sank towards the reservoir floor, flooded the lowermost accessible layers and entered the production well via a high throughput channel ('coning'). The magnitude of these effects were, however, sensitive to well perforation depth, the influence of which was subsequently studied systematically. Well perforation depth was found to determine the duration of these sinking and coning events in a non-linear manner.
Subject Numerical Solution of Differential and Integral Equations
Natural Resource Management
Petroleum and Reservoir Engineering
Keyword(s) Carbon dioxide sequestration
Compositional reservoir simulation
Dispersivity vs. saturation
Enhanced gas recovery (EGR)
Finite element modelling
Multiphase flow in porous media
DOI - identifier 10.1016/j.energy.2017.09.074
Copyright notice © 2017 Elsevier Ltd. All rights reserved.
ISSN 0360-5442
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