西南石油大学学报(自然科学版)

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Research on Phase Behavior of High CO2 Fluid of Songnan#br# Volcanic Reservoir

Jia Ying1*, Yan Jin1, Sun Lei2, Shi Zhiliang1, Zhen Rongchen1   

  1. 1. Research Institute of Petroleum Exploration & Development,SINOPEC,Haidian,Beijing 100083,China
    2. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu,Sichuan 610500,China
  • Online:2015-10-01 Published:2015-10-01

Abstract:

Songnan volcanic gas reservoir has high concentration of CO2 and the phase behavior is very complex. In the
near critical region,the phase change trend,such as density and viscosity over temperature,is different from that of common
hydrocarbon gas. The abnormal phase change may influence the development of gas field,and even create the production
accidents. Thus,it is necessary to carry out research on high CO2 fluid of Songnan gas reservoir. Firstly,a series of PVT
experiments of high CO2 fluid were conducted. PVT parameters of fluid with different CO2concentration were detected and
calculated. Then,in order to analyze the near-critical character of CO2 fluid,the EOS for fluid with high concentration of CO2
was modified. Finally,p − T phase graph of fluid with CO2 concentration was drawn,which provided the foundation for the
judgment of the phase behavior of Songnan gas field.

Key words: high CO2 fluid, volcanic gas reservoir, PVT experiment, phase behavior analysis, super critical phenomenon

CLC Number: