A permeability model for coal and other fractured, sorptive-elastic media

Robertson, E P; Christiansen, R L

doi:10.2118/104380-PA

Title: A permeability model for coal and other fractured, sorptive-elastic media

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Abstract

This paper describes the derivation of a new equation that can be used to model the permeability behavior of a fractured, sorptive-elastic medium, such as coal, under variable stress conditions. The equation is applicable to confinement pressure schemes commonly used during the collection of permeability data in the laboratory. The model is derived for cubic geometry under biaxial or hydrostatic confining pressures. The model is designed to handle changes in permeability caused by adsorption and desorption of gases onto and from the matrix blocks in fractured media. The model equations can be used to calculate permeability changes caused by the production of methane (CH{sub 4}) from coal as well as the injection of gases, such as carbon dioxide, for sequestration in coal. Sensitivity analysis of the model found that each of the input variables can have a significant impact on the outcome of the permeability forecast as a function of changing pore pressure, thus, accurate input data are essential. The permeability model also can be used as a tool to determine input parameters for field simulations by curve fitting laboratory-generated permeability data. The new model is compared to two other widely used coal-permeability models using a hypothetical coal with averagemore » properties.« less

Authors:

Robertson, E P; Christiansen, R L ^[1]

Marathon Oil Co., Houston, TX (United States). Research & Development Facility

Publication Date:: Mon Sep 15 00:00:00 EDT 2008

OSTI Identifier:: 21116247

Resource Type:: Journal Article

Journal Name:: SPE Journal

Additional Journal Information:: Journal Volume: 13; Journal Issue: 3; Journal ID: ISSN 1086-055X

Country of Publication:: United States

Language:: English

Subject:: 01 COAL, LIGNITE, AND PEAT; COAL; PERMEABILITY; EQUATIONS; FRACTURES; MATHEMATICAL MODELS; ADSORPTION; DESORPTION; GASES; METHANE; DEGASSING; CARBON DIOXIDE; CARBON SEQUESTRATION; SENSITIVITY ANALYSIS

Citation Formats


                    Robertson, E P, and Christiansen, R L. A permeability model for coal and other fractured, sorptive-elastic media.  United States: N. p., 2008. 
        Web.  doi:10.2118/104380-PA.

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                    Robertson, E P, & Christiansen, R L. A permeability model for coal and other fractured, sorptive-elastic media.  United States.  https://doi.org/10.2118/104380-PA

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                    Robertson, E P, and Christiansen, R L. 2008.  
        "A permeability model for coal and other fractured, sorptive-elastic media".  United States.  https://doi.org/10.2118/104380-PA.

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@article{osti_21116247,

  title        = {A permeability model for coal and other fractured, sorptive-elastic media},

  author       = {Robertson, E P and Christiansen, R L},

  abstractNote = {This paper describes the derivation of a new equation that can be used to model the permeability behavior of a fractured, sorptive-elastic medium, such as coal, under variable stress conditions. The equation is applicable to confinement pressure schemes commonly used during the collection of permeability data in the laboratory. The model is derived for cubic geometry under biaxial or hydrostatic confining pressures. The model is designed to handle changes in permeability caused by adsorption and desorption of gases onto and from the matrix blocks in fractured media. The model equations can be used to calculate permeability changes caused by the production of methane (CH{sub 4}) from coal as well as the injection of gases, such as carbon dioxide, for sequestration in coal. Sensitivity analysis of the model found that each of the input variables can have a significant impact on the outcome of the permeability forecast as a function of changing pore pressure, thus, accurate input data are essential. The permeability model also can be used as a tool to determine input parameters for field simulations by curve fitting laboratory-generated permeability data. The new model is compared to two other widely used coal-permeability models using a hypothetical coal with average properties.},

  doi          = {10.2118/104380-PA},

  url          = {https://www.osti.gov/biblio/21116247},
  journal      = {SPE Journal},

  issn         = {1086-055X},

  number       = 3,

  volume       = 13,

  place        = {United States},

  year         = {Mon Sep 15 00:00:00 EDT 2008},

  month        = {Mon Sep 15 00:00:00 EDT 2008}

}

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