The impact of residual water on CH4-CO2 dispersion in consolidated rock cores

Abdolvahab Honari, Marco Zecca, Sarah J. Vogt, Stefan Iglauer, Branko Bijeljic, Michael L. Johns, Eric F. May

    Research output: Contribution to journalArticle

    16 Citations (Scopus)

    Abstract

    Assessment of the viability of enhanced gas recovery (EGR), in which CO2 is injected into natural gas reservoirs, requires accurate and appropriate reservoir simulations. These necessitate provision of parameters describing dispersion between the fluids. Here we systematically measure fluid dispersion in various rock cores (sandstones and carbonates), both dry and at irreducible water saturation, at reservoir conditions. In this manner we evaluate the impact of the irreducible water on the miscible displacement processes. As such this represents the first measurement of dispersion as a function of water saturation for supercritical gases in consolidated media. Complementary measurements of water spatial distribution along the rock axis, as well as the pore size distribution occupied by the water were performed using magnetic resonance techniques. Irreducible water was found to increase dispersivity by a factor of up to 7.3. The dispersion coefficient (K) was measured as a function of velocity and the data for both dry and water-containing samples were successfully combined on a K-Péclet number (Pe) plot, enabling ready future inclusion into EGR reservoir models. The power-law dependence of K upon Pe produced an exponent of 1.2 for dry and water-saturated sandstones and 1.4 for dry and water-saturated carbonates, consistent with literature results (Bijeljic et al., 2011; Honari et al., 2015).

    Original languageEnglish
    Pages (from-to)100-111
    Number of pages12
    JournalInternational Journal of Greenhouse Gas Control
    Volume50
    DOIs
    Publication statusPublished - 1 Jul 2016

    Fingerprint

    Rocks
    rock
    Water
    water
    Sandstone
    Carbonates
    Gases
    gas
    sandstone
    saturation
    carbonate
    Recovery
    dispersivity
    Fluids
    fluid
    Magnetic resonance
    Spatial distribution
    Pore size
    natural gas
    Natural gas

    Cite this

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    title = "The impact of residual water on CH4-CO2 dispersion in consolidated rock cores",
    abstract = "Assessment of the viability of enhanced gas recovery (EGR), in which CO2 is injected into natural gas reservoirs, requires accurate and appropriate reservoir simulations. These necessitate provision of parameters describing dispersion between the fluids. Here we systematically measure fluid dispersion in various rock cores (sandstones and carbonates), both dry and at irreducible water saturation, at reservoir conditions. In this manner we evaluate the impact of the irreducible water on the miscible displacement processes. As such this represents the first measurement of dispersion as a function of water saturation for supercritical gases in consolidated media. Complementary measurements of water spatial distribution along the rock axis, as well as the pore size distribution occupied by the water were performed using magnetic resonance techniques. Irreducible water was found to increase dispersivity by a factor of up to 7.3. The dispersion coefficient (K) was measured as a function of velocity and the data for both dry and water-containing samples were successfully combined on a K-P{\'e}clet number (Pe) plot, enabling ready future inclusion into EGR reservoir models. The power-law dependence of K upon Pe produced an exponent of 1.2 for dry and water-saturated sandstones and 1.4 for dry and water-saturated carbonates, consistent with literature results (Bijeljic et al., 2011; Honari et al., 2015).",
    keywords = "Carbon dioxide, Consolidated rock, Dispersion, Enhanced gas recovery, Residual water saturation, Sequestration",
    author = "Abdolvahab Honari and Marco Zecca and Vogt, {Sarah J.} and Stefan Iglauer and Branko Bijeljic and Johns, {Michael L.} and May, {Eric F.}",
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    The impact of residual water on CH4-CO2 dispersion in consolidated rock cores. / Honari, Abdolvahab; Zecca, Marco; Vogt, Sarah J.; Iglauer, Stefan; Bijeljic, Branko; Johns, Michael L.; May, Eric F.

    In: International Journal of Greenhouse Gas Control, Vol. 50, 01.07.2016, p. 100-111.

    Research output: Contribution to journalArticle

    TY - JOUR

    T1 - The impact of residual water on CH4-CO2 dispersion in consolidated rock cores

    AU - Honari, Abdolvahab

    AU - Zecca, Marco

    AU - Vogt, Sarah J.

    AU - Iglauer, Stefan

    AU - Bijeljic, Branko

    AU - Johns, Michael L.

    AU - May, Eric F.

    PY - 2016/7/1

    Y1 - 2016/7/1

    N2 - Assessment of the viability of enhanced gas recovery (EGR), in which CO2 is injected into natural gas reservoirs, requires accurate and appropriate reservoir simulations. These necessitate provision of parameters describing dispersion between the fluids. Here we systematically measure fluid dispersion in various rock cores (sandstones and carbonates), both dry and at irreducible water saturation, at reservoir conditions. In this manner we evaluate the impact of the irreducible water on the miscible displacement processes. As such this represents the first measurement of dispersion as a function of water saturation for supercritical gases in consolidated media. Complementary measurements of water spatial distribution along the rock axis, as well as the pore size distribution occupied by the water were performed using magnetic resonance techniques. Irreducible water was found to increase dispersivity by a factor of up to 7.3. The dispersion coefficient (K) was measured as a function of velocity and the data for both dry and water-containing samples were successfully combined on a K-Péclet number (Pe) plot, enabling ready future inclusion into EGR reservoir models. The power-law dependence of K upon Pe produced an exponent of 1.2 for dry and water-saturated sandstones and 1.4 for dry and water-saturated carbonates, consistent with literature results (Bijeljic et al., 2011; Honari et al., 2015).

    AB - Assessment of the viability of enhanced gas recovery (EGR), in which CO2 is injected into natural gas reservoirs, requires accurate and appropriate reservoir simulations. These necessitate provision of parameters describing dispersion between the fluids. Here we systematically measure fluid dispersion in various rock cores (sandstones and carbonates), both dry and at irreducible water saturation, at reservoir conditions. In this manner we evaluate the impact of the irreducible water on the miscible displacement processes. As such this represents the first measurement of dispersion as a function of water saturation for supercritical gases in consolidated media. Complementary measurements of water spatial distribution along the rock axis, as well as the pore size distribution occupied by the water were performed using magnetic resonance techniques. Irreducible water was found to increase dispersivity by a factor of up to 7.3. The dispersion coefficient (K) was measured as a function of velocity and the data for both dry and water-containing samples were successfully combined on a K-Péclet number (Pe) plot, enabling ready future inclusion into EGR reservoir models. The power-law dependence of K upon Pe produced an exponent of 1.2 for dry and water-saturated sandstones and 1.4 for dry and water-saturated carbonates, consistent with literature results (Bijeljic et al., 2011; Honari et al., 2015).

    KW - Carbon dioxide

    KW - Consolidated rock

    KW - Dispersion

    KW - Enhanced gas recovery

    KW - Residual water saturation

    KW - Sequestration

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    JO - International Journal of Greenhouse Gas Control

    JF - International Journal of Greenhouse Gas Control

    SN - 1750-5836

    ER -