Lithologic Reservoirs ›› 2011, Vol. 23 ›› Issue (3): 115-118.doi: 10.3969/j.issn.1673-8926.2011.03.022

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Experimental study on influence of CO2 content on natural gas properties

WANG Jinchang1， DU Jianfen2， ZENG Zheng3， GUO Ping2， YUAN Lihe1   

  1. （1. Research Institute of Engineering Technology， Huabei Branch， Sinopec， Zhengzhou 450006， China； 2. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation， Southwest Petroleum University，Chengdu 610500， China； 3. Department of Production， Yumen Oilfield Company， PetroChina， Yumen 735200， China
  • Online:2011-06-20 Published:2011-06-20

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Abstract:

The constant composition expansion experiments on natural gas with CO2 content of 10%, 30%, 50%, 70%, 90%, 100% under three different temperatures （20 ℃, 30 ℃, 40 ℃） are conducted respectively. The results showthat with the CO2 content increasing from10% to 100%, the critical temperature of natural gas samples increases from - 69.86℃ to 31.4 ℃, and the critical pressure increases from 4.85 MPa to 7.38 MPa. When the temperature and pressure is constant, with the increasing of CO2 content in natural gas, the relative volume of natural gas samples shows an increase, and with the decreasing of pressure, the volume expansion lawof natural gas samples with different CO2 content shows a similar phenomenon in the supercritical CO2 characteristics. This cognition is significant for the further study on oil displacement by mixture of CO2 and natural gas.

Key words: low-amplitude structure, S-transformation, seismic cycle, Junggar Basin

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