Lithologic Reservoirs ›› 2018, Vol. 30 ›› Issue (4): 113-119.doi: 10.12108/yxyqc.20180413

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Calculation of phase behavior for CO2-water mixtures using CPA EoS

TU Hanmin1, GUO Ping1, JIA Na2, WANG Zhouhua1, WANG Qian3   

  1. 1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China;
    2. Program of Petroleum Systems Engineering, Faculty of Engineering and Applied Science, University of Regina, Regina S4S0A2, Canada;
    3. CNOOC China Co. Ltd. Tianjing Company, Tianjing 300452, China
  • Received:2018-01-16 Revised:2018-03-31 Online:2018-07-21 Published:2018-07-21

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Abstract: Carbon dioxide(CO2)is an acid gas, and its thermodynamic properties are vital to numerous processes in the oil and gas. Water always coexists with hydrocarbons in petroleum reservoirs, and the presence of brine may reduce the amount of gas to be mixed with hydrocarbons. This effect increases with increasing pressure and the amount of aqueous phase(while decreases with the decreasing of salinity). Hence, the understanding of the thermodynamics of CO2-water mixtures is quite crucial for the rational design and operation of many processes. The characteristics of phase behavior for CO2-water mixtures were studied by using Cubic-Plus-Association (CPA)Equation of State(EoS)to combine with the CR-1 mixing rule to assess the mutual solubility of CO2 and water. CO2 can be treated in three different ways:(1)as a non-associating molecule; (2)as an associating molecule that can be cross-associate with water(solvation);(3)as a self and cross associating molecule. As water is considered as an associating molecule,it has three association schemes of 2 B, 3 B and 4 C. The performance of CPA EoS using different interaction models was evaluated and discussed at three temperatures of 308 K, 373 K and 473 K, and also was compared to various recent published investigations. It demonstrates the complicated phase behavior of CO2 and water, especially when they are close to the critical point of CO2, where thermodynamic properties sudden changed. The results show that good agreement with experimental data can be achieved when CO2 is considered as a non-associating molecule and 4 C association scheme is considered in the calculation model.

Key words: water drive gas reservoir, water invasion identification, water production laws, controlling factors, water size, Xihu Sag

CLC Number: 

  • TE357.45
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