The error in using superposition to estimate pressure during multi‐site subsurface CO 2 storage

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Title: The error in using superposition to estimate pressure during multi‐site subsurface CO 2 storage
Authors: De Simone, S
Jackson, SJ
Krevor, S
Item Type: Journal Article
Abstract: Analytic pressure estimates for multisite CO2 injection are typically performed through the superposition of single‐site injection models. This is theoretically invalid for multiphase flow because of its nonlinearity. We quantify the error associated with the application of superposition in scenarios with sites located in a rectangular grid geometry. We show that the use of superposition results in overestimates of the pressure buildup, because it neglects the presence of multiple CO2 plumes, which increase the reservoir fluid mobility. The adoption of a dimensionless time scaled to the geometric average between the advective and diffusive characteristic times allows us to define a general model for the maximum error, which may be used to evaluate the validity of using superposition, or to correct the pressure estimates when errors are significant. This procedure can be applied to any analytical solution and advances the extension of single‐well models to scenarios of multiple injection sites.
Issue Date: 1-Jan-2019
Date of Acceptance: 24-May-2019
ISSN: 0094-8276
Publisher: American Geophysical Union (AGU)
Journal / Book Title: Geophysical Research Letters
Copyright Statement: © 2019 Owner. This is the accepted version of the following article: De Simone, S., Jackson, S. J., & Krevor, S. ( 2019). The error in using superposition to estimate pressure during multisite subsurface CO2 storage. Geophysical Research Letters, 46., which has been published in final form at
Sponsor/Funder: Engineering & Physical Science Research Council (EPSRC)
Engineering & Physical Science Research Council (E
Funder's Grant Number: EP/M001369/1
UKCCSRC 2017 Partner
Keywords: MD Multidisciplinary
Meteorology & Atmospheric Sciences
Publication Status: Published online
Online Publication Date: 2019-06-18
Appears in Collections:Earth Science and Engineering

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