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A Model To Estimate Carbon Dioxide Injectivity and Storage Capacity for Geological Sequestration in Shale Gas Wells
journal contribution
posted on 2015-08-04, 00:00 authored by Ryan W. J. Edwards, Michael A. Celia, Karl W. Bandilla, Florian Doster, Cynthia
M. KannoRecent studies suggest
the possibility of CO2 sequestration
in depleted shale gas formations, motivated by large storage capacity
estimates in these formations. Questions remain regarding the dynamic
response and practicality of injection of large amounts of CO2 into shale gas wells. A two-component (CO2 and
CH4) model of gas flow in a shale gas formation including
adsorption effects provides the basis to investigate the dynamics
of CO2 injection. History-matching of gas production data
allows for formation parameter estimation. Application to three shale
gas-producing regions shows that CO2 can only be injected
at low rates into individual wells and that individual well capacity
is relatively small, despite significant capacity variation between
shale plays. The estimated total capacity of an average Marcellus
Shale well in Pennsylvania is 0.5 million metric tonnes (Mt) of CO2, compared with 0.15 Mt in an average Barnett Shale well.
Applying the individual well estimates to the total number of existing
and permitted planned wells (as of March, 2015) in each play yields
a current estimated capacity of 7200–9600 Mt in the Marcellus
Shale in Pennsylvania and 2100–3100 Mt in the Barnett Shale.