Journal of Jilin University(Earth Science Edition) ›› 2015, Vol. 45 ›› Issue (2): 564-572.doi: 10.13278/j.cnki.jjuese.201502205

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Experimental Research and Theoretical Model for CO2 Solubility in Water Under High Temperature and High Pressure

Hou Dali1,2, Luo Pingya2, Wang Changquan3, Sun Lei2, Tang Yong2, Pan Yi2   

  1. 1. The State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, China;
    2. The State Key Laboratory of Oil & Gas Reservoir Geology and Exploitation Engineering, Southwest Petroleum University, Chengdu 610500, China;
    3. Petroleum Engineering College of Yangtze University, Wuhan 430100, China
  • Received:2014-07-25 Published:2015-03-26

Abstract:

By using the independently developed high-temperature/high-pressure reactor,CO2 water solubility has been tested under different temperatures,pressures and salinities. The results show that the water solubility of CO2 increases with pressure under a certain temperature, while it declines with the increase of temperature under a certain pressure. However, when temperature is above 100℃ and pressure is around 22 MPa,the solubility is prone to decrease with increasing temperature under a low pressure (less than 22 MPa) and the solubility is prone to slightly increase with increasing temperature under a high pressure(greater than 22 MPa). Besides, under a certain temperature and pressure,CO2 water solubility decreases with the increase of water salinity. On the basis of measured and existing data, a new model has been built to calculate CO2 water solubility precisely by modifying the parameters of PR-HV EOS. In comparison to other models, its accuracy is higher with an average relative error of 2.69%.

Key words: high temperature and high pressure, CO2, solubility, theoretical model

CLC Number: 

  • TE357

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