Lithologic Reservoirs ›› 2020, Vol. 32 ›› Issue (2): 129-133.doi: 10.12108/yxyqc.20200214

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Experiment of minimum miscible pressure of CO2 flooding in ultra-low permeability reservoir

DAI Bo, WANG Leifei, ZHUANG Jian, YUAN Weibin, WANG Xuesheng   

  1. No.1 Oil Production Plant, PetroChina Changqing Oilfeild Company, Yan'an 71600, Shaanxi, China
  • Received:2019-03-20 Revised:2019-09-02 Online:2020-03-21 Published:2020-01-19

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Abstract: When measuring the minimum miscibility pressure (MMP) of CO2-crude in ultra-low permeability reservoirs,the conventional method has the problems of long measurement period and large workload,and the miscible state of CO2 and crude oil cannot be directly observed. To determine the MMP of CO2-crude oil in Xinghe ultra-low permeability reservoir quickly and accurately,the interfacial tension(IFT) method was used to conduct indoor experiments on CO2 and crude oil in Xinghe reservoir. The results show that with the increase of equilibrium pressure,the amount of CO2 dissolved in crude oil increases,and the IFT between CO2 and crude oil can be divided into two stages,and both decrease linearly. When the equilibrium pressure increases from 4 MPa to 28 MPa,the IFT between CO2 and crude oil decreases from 17.72 mN/m to 1.56 mN/m. The MMP of Xinghe reservoir measured by IFT method is 22.5 MPa,which is slightly higher than that of 22.3 MPa measured by thin tube experiment. The difference between the two values is only 0.9%,indicating that the IFT method has good accuracy in measuring the MMP of ultra-low permeability reservoir. Through the above research,the MMP of Xinghe reservoir was determined,which provides theoretical support for the development of the CO2 stimulation production plan for the Xin he reservoir. However,since the MMP is higher than the current reservoir pressure of 17.5 MPa, CO2 and crude oil can't achieve miscibility under current reservoir conditions.

Key words: ultra-low permeability reservoir, minimum miscibility pressure, interfacial tension, Xinghe reservoir

CLC Number: 

  • ET357.45
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