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A model for enhanced coal bed methane recovery aimed at carbon dioxide storage : The role of sorption, swelling and composition of injected gas

Pini, Ronny ; Storti, Giuseppe ; Mazzotti, Marco

In: Adsorption, 2011, vol. 17, no. 5, p. 889-900

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    Titel
    • A model for enhanced coal bed methane recovery aimed at carbon dioxide storage
      The role of sorption, swelling and composition of injected gas
    Autor
    • Pini, Ronny. Institute of Process Engineering, ETH Zurich, Sonneggstrasse 3, 8092, Zurich, Switzerland
    • Storti, Giuseppe. Dipartimento di Chimica, Materiali e Ing. Chimica "Giulio Natta”, Sede Mancinelli, Politecnico di Milano, Via Mancinelli 7, 20131, Milano, Italy
    • Mazzotti, Marco. Institute of Process Engineering, ETH Zurich, Sonneggstrasse 3, 8092, Zurich, Switzerland
    Dokumententyp
    • Postprint
    Sprache
    • Englisch
    Veröffentlicht in
    • Adsorption, 2011, vol. 17, no. 5, p. 889-900. Springer US; http://www.springer-ny.com
    Andere elektronische Ausgabe
    OAI-PMH-ID
    • oai:doc.rero.ch:309613
    Summary
    Numerical simulations on the performance of CO2 storage and enhanced coal bed methane (ECBM) recovery in coal beds are presented. For the calculations, aone-dimensional mathematical model is used consisting of mass balances describing gas flow and sorption, and a geomechanical relationship to account for porosity and permeability changes during injection. Important insights are obtained regarding the gas flow dynamics during displacement and the effects of sorption and swelling on the ECBM operation. In particular, initial faster CH4 recovery is obtained when N2 is added to the injected mixture, whereas pure CO2 allows for a more effective displacement in terms of total CH4 recovery. Moreover, it is shown that coal swelling dramatically affects the gas injectivity, as the closing of the fractures associated with it strongly reduces coal's permeability. As a matter of fact, injection of flue gas might represent a useful option to limit this problem