LITHOLOGIC RESERVOIRS ›› 2015, Vol. 27 ›› Issue (1): 127-130.doi: 10.3969/j.issn.1673-8926.2015.01.019

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Determination of the minimum miscibility pressure of CO 2 and crude oil system by hanging drop method

HUANG Chunxia,TANG Ruijia,YU Huagui,JIANG Shaojing   

  1.  Research Institute of Shaanxi Yanchang Petroleum （ Group ） Co. Ltd. ， Xi ’ an 710075 ， China
  • Online:2015-02-03 Published:2015-02-03

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Abstract:

 The minimum miscibility pressure of CO 2 and crude oil system is an important parameter for the research of CO 2 flooding technology. The interfacial tension data of CO 2 and crude oil system were measured by pendant drop method under the conditions of reservoir temperature of 44℃ and different pressure. The oil samples are produced in low permeability reservoir of Yanchang Oilfield. The experiment results show that the interfacial tension of CO 2 and crude oil decreased almost linearly as increasing pressure. According to the extrapolated method, the minimum miscibility pressure is 23.56 MPa when the interfacial tension of CO 2 and crude oil is zero. This method can be used to not only obtain the minimum miscibility pressure of CO 2 and crude oil system, but also directly observe the miscible phase picture of CO 2 and crude oil. The experiment is easier in operation and needs less time than the others, so it has a certain reference value on the measurement for similar experiments.

Key words: dolomitized rocks, “white smoke type&rdquo, exhalative rock, new type of tight oil reservoir, Lower Permian , Fengcheng Formation, Urho area, Junggar Basin

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