Influence of Shrinkage and Swelling Properties of Coal on Geologic Sequestration of Carbon Dioxide

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The potential for enhanced methane production and geologic sequestration of carbon dioxide in coalbeds needs to be evaluated before large-scale sequestration projects are undertaken. Geologic sequestration of carbon dioxide in deep unmineable coal seams with the potential for enhanced coalbed methane production has become a viable option to reduce greenhouse gas emissions. The coal matrix is believed to shrink during methane production and swell during the injection of carbon dioxide, causing changes in tlie cleat porosity and permeability of the coal seam. However, the influence of swelling and shrinkage, and the geomechanical response during the process of carbon dioxide injection ... continued below

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Siriwardane, H. J.; Gondle, R. & Smith, D. H. May 1, 2007.

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The potential for enhanced methane production and geologic sequestration of carbon dioxide in coalbeds needs to be evaluated before large-scale sequestration projects are undertaken. Geologic sequestration of carbon dioxide in deep unmineable coal seams with the potential for enhanced coalbed methane production has become a viable option to reduce greenhouse gas emissions. The coal matrix is believed to shrink during methane production and swell during the injection of carbon dioxide, causing changes in tlie cleat porosity and permeability of the coal seam. However, the influence of swelling and shrinkage, and the geomechanical response during the process of carbon dioxide injection and methane recovery, are not well understood. A three-dimensional swelling and shrinkage model based on constitutive equations that account for the coupled fluid pressure-deformation behavior of a porous medium was developed and implemented in an existing reservoir model. Several reservoir simulations were performed at a field site located in the San Juan basin to investigate the influence of swelling and shrinkage, as well as other geomechanical parameters, using a modified compositional coalbed methane reservoir simulator (modified PSU-COALCOMP). The paper presents numerical results for interpretation of reservoir performance during injection of carbon dioxide at this site. Available measured data at the field site were compared with computed values. Results show that coal swelling and shrinkage during the process of enhanced coalbed methane recovery can have a significant influence on the reservoir performance. Results also show an increase in the gas production rate with an increase in the elastic modulus of the reservoir material and increase in cleat porosity. Further laboratory and field tests of the model are needed to furnish better estimates of petrophysical parameters, test the applicability of thee model, and determine the need for further refinements to the mathematical model.

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Publisher - on CD Proceedings of 2007 International Coalbed Methane Symposium, May 2007, paper 720, 15 pp.

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  • 2007 International Coalbed Methane Symposium, Tuscaloosa, AL, May 21-25, 2007; Related Information: Both paper and slide presentation included in this PDF file.

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  • Report No.: DOE/NETL-IR-2007-149
  • Grant Number: None cited
  • Office of Scientific & Technical Information Report Number: 915489
  • Archival Resource Key: ark:/67531/metadc878063

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  • May 1, 2007

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  • Sept. 22, 2016, 2:13 a.m.

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  • Nov. 4, 2016, 2:07 p.m.

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Siriwardane, H. J.; Gondle, R. & Smith, D. H. Influence of Shrinkage and Swelling Properties of Coal on Geologic Sequestration of Carbon Dioxide, article, May 1, 2007; Tuscaloosa, Alabama. (digital.library.unt.edu/ark:/67531/metadc878063/: accessed August 17, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.