Lithologic Reservoirs ›› 2016, Vol. 28 ›› Issue (4): 106-112.doi: 10.3969/j.issn.1673-8926.2016.04.015

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Pressure transient analysis on CO2 flooding in low permeability reservoirs considering fluid heterogeneity

Li Youquan1，Meng Fankun2，Yan Yan1，Han Fengrui1，Yu Weijie1，Zhou Shiyu3   

  1. （1. Research Institute of Exploration and Development，Sinopec Shengli Oilfield Company，Dongying 257015，Shandong，China；2. College of Petroleum Engineering，China University of Petroleum，Qingdao 266580，Shandong，China；3. Geophysical Prospecting Company of Chuanqing Drilling Engineering，CNPC，Chengdu 610213，China）
  • Online:2016-07-20 Published:2016-07-20

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Abstract:

CO2 flooding in low permeability reservoirs is considered as one of the most significant EOR methods.However, there is lack of clear recognition on pressure response performance during the flooding process currently.Injection of CO2 will change the physical property of reservoir fluids, and three zones could be developed, which are CO2 zone, CO2 -oil transition zone and unswept oil zone, respectively. Hence, based on the seepage theory of composite reservoir model, the power?law and Newton interpolation equations were introduced to describe the variable characteri?stics of fluid heterogeneity in CO2 -oil transition zone. The well testing model for CO2 flooding in low  permeability reservoir was presented, and it was solved by numerical differential method. The pressure transient curves at two different fluid heterogeneity variation forms were analyzed. The results demonstrate that for power-law variation of viscosity and compressibility in CO2 -oil transition zone, the mobility and diffusivity ratio between CO2 zone and CO2 -oil transition zone increased with variation exponents, which leads to the rise of pressure derivative curves slope. As the compressibility in CO2 -oil transition zone varied discontinuously, since the increase of diffusivity ration between CO2 region and CO2 -oil transition region, the pressure derivative curves would drop. Finally,the well testing explanation method for CO2 flooding was presented through the application of real case.

Key words: Yijianfang Formation, carbonate rocks, diagenesis, Shunnan area, Tarim Basin

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