TY - JOUR
T1 - Phase equilibria for petroleum reservoir fluids containing water and aqueous methanol solutions
T2 - Experimental measurements and modelling using the CPA equation of state
AU - Hooman, Haghighi
AU - Chapoy, Antonin
AU - Burgass, Rhoderick William
AU - Mazloum Vajari, Saeid
AU - Tohidi Kalorazi, Bahman
PY - 2009/4/15
Y1 - 2009/4/15
N2 - Thermodynamic inhibitors, such as methanol, are widely used to reduce the risks associated with gas hydrate formation. The work presented in this communication is the result of a study on the phase equilibria of petroleum reservoir fluids in the presence of aqueous methanol solutions. Experimental hydrate dissociation data, for systems composed of methane/water/methanol and natural gas/water/methanol, in addition to experimental freezing point depression data for aqueous methanol solutions, are reported. A statistical thermodynamic approach, with the cubic-plus-association equation of state (CPA-EoS), is employed to model the phase equilibria. The hydrate-forming conditions are modelled by the solid solution theory of van der Waals and Platteeuw. The thermodynamic model was used to predict the hydrate dissociation conditions of methane and natural gases in the presence of distilled water or methanol aqueous solutions. Predictions of the developed model are validated against independent experimental data and the data generated in this work. A good agreement between predictions and experimental data is observed, supporting the reliability of the developed model. © 2009 Elsevier B.V. All rights reserved.
AB - Thermodynamic inhibitors, such as methanol, are widely used to reduce the risks associated with gas hydrate formation. The work presented in this communication is the result of a study on the phase equilibria of petroleum reservoir fluids in the presence of aqueous methanol solutions. Experimental hydrate dissociation data, for systems composed of methane/water/methanol and natural gas/water/methanol, in addition to experimental freezing point depression data for aqueous methanol solutions, are reported. A statistical thermodynamic approach, with the cubic-plus-association equation of state (CPA-EoS), is employed to model the phase equilibria. The hydrate-forming conditions are modelled by the solid solution theory of van der Waals and Platteeuw. The thermodynamic model was used to predict the hydrate dissociation conditions of methane and natural gases in the presence of distilled water or methanol aqueous solutions. Predictions of the developed model are validated against independent experimental data and the data generated in this work. A good agreement between predictions and experimental data is observed, supporting the reliability of the developed model. © 2009 Elsevier B.V. All rights reserved.
KW - CPA equation of state
KW - Experimental data
KW - Gas hydrate
KW - Melting point depression
KW - Methane
KW - Methanol
KW - Natural gas
KW - Thermodynamic modelling
KW - Water
UR - http://www.scopus.com/inward/record.url?scp=62149091045&partnerID=8YFLogxK
U2 - doi:10.1016/j.fluid.2009.01.009
DO - doi:10.1016/j.fluid.2009.01.009
M3 - Article
SN - 0378-3812
VL - 278
SP - 109
EP - 116
JO - Fluid Phase Equilibria
JF - Fluid Phase Equilibria
IS - 1-2
ER -