Lithologic Reservoirs ›› 2017, Vol. 29 ›› Issue (6): 119-127.doi: 10.3969/j.issn.1673-8926.2017.06.015

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Pressure transient analysis on CO2 huff and puff in low permeability reservoir

LI Youquan1, HAN Xiuhong2, YAN Yan1, ZHANG Dezhi1, ZHOU Zhiwei2, MENG Fankun3   

  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. PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China
  • Received:2017-05-03 Revised:2017-07-12 Online:2017-11-21 Published:2017-11-21

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Abstract: CO2 huff and puff are important way to improve oil recovery in low permeability reservoir. However, the recognition of the pressure response performance is not clear. After the injection of CO2 in low permeability reservoir,the fluid properties such as viscosity vary with the CO2 concentration,resulting in the phenomenon of plane heterogeneity. In order to characterize the pressure transient, the CO2 concentration distribution was obtained based on Fick's law to characterize the fluid property. The permeability modulus and starting pressure gradient were introduced in Darcy flow equation to characterize the low permeability characteristics. The pressure response model for CO2 huff and puff in low permeability reservoir was established by viscosity coupling concentration equation and flow equation,and it was solved by numerical method. The reliability of the model was verified by analytical method and numerical simulation, and finally the influences of low permeability properties and CO2 concentration on the pressure response curve were analyzed. The results show that the increase of starting-up pressure gradient leads to higher CO2 injection pressure and the rise of pressure and pressure derivative curve slope. The pressure and pressure derivative curve slope become smaller with the increase of the permeability modulus. The diffusion of CO2becomes faster while increasing the injection rate of CO2,and the injection pressure becomes larger,at the same time,the boundary between swept area and unswept area is clearer. As the diffusion efficient of CO2 increases,the difference of fluid properties in difference place becomes smaller and the boundary between swept area and unswept area is not clear. This model can be applied to well testing of CO2 huff and puff process in low permeability reservoir, the prediction of reservoir parameter and analysis of CO2 concentration distribution.

Key words: glutenite reservoirs, pyrite, identification chart, equivalent volume model, Qigu Formation, Junggar Basin

CLC Number: 

  • TE348
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