Journal article

CO2 enhanced flow characteristics of naturally-fractured bituminous coals with N-2 injection at different reservoir depths

XG Zhang, PG Ranjith, DY Li, MSA Perera, AS Ranathunga, BN Zhang

JOURNAL OF CO2 UTILIZATION | ELSEVIER SCI LTD | Published : 2018

Abstract

Coal matrix swelling caused by the adsorption of CO2 during the CO2-ECBM process is the major reason for the decline of coal permeability and CO2 injectivity. Measures to recover this permeability reduction are of significant importance for the field projects. Many studies to date have established the responses of the coal matrix upon the adsorption of CO2 under various laboratory conditions, and some have revealed that the injection of N2 into swelled coal can recover coal permeability to some extent. This study therefore examines the effect of various N2 saturation durations on the permeability alteration of the swelled coals subjected to the adsorption of sub- and super-critical CO2 at di..

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University of Melbourne Researchers