西南石油大学学报(自然科学版)

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Establishment of the Chart of Equivalent Gas Ratio-Recovery Degree for
CO2 Miscible Flooding

Sun Lei1, Feng Qiao1, Chen Guoli2, Zhang Hua2, Jin Meiyu3   

  1. 1. State of Key Laboratory of Oil & Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu,Sichuan 610500,China
    2. Jilin Oilfield Company,PetroChina,Songyuan,Jilin 138000,china
    3. Korla General Vocational and Technical College,Korla,Xinjiang 841000,China
  • Online:2014-02-01 Published:2014-02-01

Abstract:

Because the dynamic evaluation methods of CO2 miscible drive is not enough comprehensive and systematic,and
also the improved water flooding chart is not suitable for the evaluation of the CO2 miscible drive,we first define the type A
gas flooding characteristic curve. Then on the basis of it,we have derived the relational expression between the equivalent gas
rate and recovery degree,and draw the calibration chart. We use this chart to predict the biggest increased recovery of Y block
after injecting CO2,and by comparing with the scene results,we find that two of them are consistent. So the results that the
chart is a good predictor of the biggest increased recovery after injecting CO2. In general,this method is more significant for
the block’s further development.

Key words: CO2 miscible flooding, equivalent gas rate, recovery degree, enhanced maximum recovery rate, chart