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Journal of Chemistry
Volume 2015 (2015), Article ID 873718, 11 pages
Research Article

Phase Behavior and Physical Parameters of Natural Gas Mixture with

Dali Hou,1,2,3 Hucheng Deng,1,2 Hao Zhang,1,2 Kai Li,1,2 Lei Sun,3 and Yi Pan3

1School of Energy Resources, Chengdu University of Technology, Chengdu, Sichuan 610059, China
2The State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu, Sichuan 610059, China
3The State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Engineering, Southwest Petroleum University, Xindu Avenue No. 8, Chengdu, Sichuan 610500, China

Received 3 January 2015; Revised 28 March 2015; Accepted 4 April 2015

Academic Editor: Christophe Coquelet

Copyright © 2015 Dali Hou et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The two-flash experiment, constant composition expansion experiment, saturation pressure measurement experiment, and phase transition observation experiment from well bottom hole to well head of four high CO2 content natural gas samples were carried out by using the JEFRI-PVT apparatus made from DBR Company of Canada. The experimental results show that in the four high CO2 content gas samples no phase transitions will take place at temperatures greater than 35°C. In the gas-liquid two-phase region, saturation pressures, critical pressure, critical temperature, and an integrated P-T phase diagram of different CO2 content natural gases are calculated by using the modified PR equation of state and modified (T) equation proposed by Saffari. The deviations between the saturation pressure calculated by using the model proposed in this study and experimental measured saturation pressure are very small; the average relative error is only 2.86%. Thus, the model can be used to predict the phase equilibrium parameters of high CO2 content natural gas.