Lithologic Reservoirs ›› 2012, Vol. 24 ›› Issue (6): 125-128.doi: 10.3969/j.issn.1673-8926.2012.06.023

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Determination of minimum miscibility pressure for CO2 flooding by using PR equation of state

YE Anping1， GUO Ping1， WANG Shaoping2， CHENG Zhongzhao3， JIAN Rui4   

  1. 1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation，Southwest Petroleum University， Chengdu 610500, China； 2. No. 2 Oil Production Plant， PetroChina Changqing Oilfield Company，Qingyang 745100， China； 3. Xi’an Changqing Technology & Engineering Co. Ltd.， Xi’an 710018， China； 4. Puguang Branch，Zhongyuan Oilfield Company，Sinopec，Dazhou 637156，China
  • Online:2012-12-20 Published:2012-12-20

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Abstract:

When carbon dioxide comes in contact with oil, the mass transfer phenomena occur. The compositions of two phases become similar, and the interfacial tension disappears, and then gas and oil form miscible. The minimum miscibility pressure（MMP） is an important parameter in CO2 injection process. There are manymethods for the determination ofMMP, and the slimtube test is the most widely used one. However, the experiments are time-consuming, and the empirical formula has great limitations. Thus the PR equation of state ofMMP determined for CO2 flooding is a good choice. The composition of each component could be determined by the PR equation of state when the gas-liquid phase achieves balance. MMP could be calculated by using the miscibility function. The result shows that the MMP determined
by PR equation of state is more accurate than that by empirical equations. The iterative precision of the miscibility function has a significant impact on the result.

Key words: seismic facies identification, frequency attributes, sedimentary facies, Sungang area, Biyang sag

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