Thermodynamics Research Center / ThermoML | Journal of Chemical and Engineering Data

Water Solubility at Saturation for CO2 CH4 Mixtures at 323.2 K and 9.000 MPa

Loring, J. S.[John S.], Bacon, D. H.[Diana H.], Springer, R. D.[Ronald D.], Anderko, A.[Andrzej], Gopinath, S.[Smitha], Yonkofski, C. M.[Catherine M.], Thompson, C. J.[Christopher J.], McGrail, B. P.[Bernard Peter], Rosso, K. M.[Kevin M.], Schaef, H. T.[Herbert T.]
J. Chem. Eng. Data 2017, 62, 5, 1608-1614
ABSTRACT
The concentration of H2O dissolved in CO2-CH4 supercritical fluids is an important parameter that can control shale permeability, affect CH4 transmissivity, and ultimately impact the efficiency of CO2 Enhance Gas Recovery (EGR) operations. Here, we use in situ highpressure infrared (IR) spectroscopic titrations to quantify the solubility of H2O in six CO2-CH4 mixtures, ranging from pure CO2 to pure CH4, at shallow shale reservoir conditions of 50 deg C and 90 bar. Measured concentrations of H2O at saturation increase with increasing mole percent CO2, and our results are in agreement with limited data available in the literature. We use these experimental results to benchmark three current thermodynamic multi-phase routines: the Mixed-Solvent Electrolyte (MSE), STOMP-COMP, and the Statistical Associating Fluid Theory for variable range Mie potentials (SAFT a-Mie) equations of state. Of these models, MSE and STOMP-COMP accurately predict maximum H2O solubilities of the binary CO2-H2O and CH4- H2O systems, and they also reproduce the shape of the water solubility curve as a function of mole percent CO2. Hence, these routines should work well to predict H2O content in reservoir simulations and help to make informed decisions concerning injection strategies for CO2 EGR in shale plays at shallow depths.
Compounds
# Formula Name
1 CH4 methane
2 H2O water
3 CO2 carbon dioxide
Datasets
The table above is generated from the ThermoML associated json file (link above). POMD and RXND refer to PureOrMixture and Reaction Datasets. The compound numbers are included in properties, variables, and phases, if specificied; the numbers refer to the table of compounds on the left.
Type Compound-# Property Variable Constraint Phase Method #Points
  • POMD
  • 1
  • 3
  • 2
  • Mole fraction - 2 ; Fluid (supercritical or subcritical phases)
  • Solvent: Mole fraction - 3; Fluid (supercritical or subcritical phases)
  • Temperature, K; Fluid (supercritical or subcritical phases)
  • Pressure, kPa; Fluid (supercritical or subcritical phases)
  • Fluid (supercritical or subcritical phases)
  • Liquid
  • Titration method
  • 6
  • POMD
  • 1
  • 2
  • Boiling temperature at pressure P, K ; Fluid (supercritical or subcritical phases)
  • Mole fraction - 2; Fluid (supercritical or subcritical phases)
  • Pressure, kPa; Fluid (supercritical or subcritical phases)
  • Fluid (supercritical or subcritical phases)
  • Liquid
  • Titration method
  • 1
  • POMD
  • 3
  • 2
  • Boiling temperature at pressure P, K ; Fluid (supercritical or subcritical phases)
  • Mole fraction - 2; Fluid (supercritical or subcritical phases)
  • Pressure, kPa; Fluid (supercritical or subcritical phases)
  • Fluid (supercritical or subcritical phases)
  • Liquid
  • Titration method
  • 1