Lithologic Reservoirs ›› 2020, Vol. 32 ›› Issue (4): 136-142.doi: 10.12108/yxyqc.20200414

• OIL AND GAS FIELD DEVELOPMENT • Previous Articles     Next Articles

Influence mechanism of acidification on oil recovery during CO2 flooding

SUN Huizhu1,2,3, ZHU Yushuang1,2, WEI Yong4, GAO Yuan3,5   

  1. 1. State Key Laboratory of Continental Dynamics, Northwest University, Xi'an 710069, China;
    2. Department of Geology, Northwest University, Xi'an 710069, China;
    3. School of Petroleum Engineering, Xi'an Shiyou University, Xi'an 710065, China;
    4. Fengcheng Oilfield Operation Area, PetroChina Xinjiang Oilfield Company, Karamay 834014, Xinjiang, China;
    5. Shaanxi Gas Group Co., Ltd., Xi'an 710016, China
  • Received:2019-12-28 Revised:2020-02-27 Online:2020-08-01 Published:2020-06-16

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Abstract: The acidification of CO2 can cause damage to the reservoir to a certain extent. In order to reveal the influence mechanism of acidification on oil recovery,six core samples with the same level of permeability were selected for CO2 flooding tests under the conditions of reservoir temperature and pressure,and then the influence mechanism of acidification on oil recovery was evaluated by NMR technique. The results show that the pH value of the displaced fluids is lower than that of the original formation water,and the change of the ion concentration before and after CO2 flooding reflects the dissolution of feldspar and carbonate minerals. The permeability of the core samples decreased after CO2 flooding,and the longer the reaction time,the greater the decrease of permeability. The ultimate recovery factor of the core sample is inversely proportional to the reaction time. The core sample with a reaction time of 240 h was reduced by 27.31% compared to the core sample of 0 h. Comprehensive analysis shows that the long-term acidification and corrosion reaction products of CO2 flooding and the exfoliated clay particles will block the pore throat,resulting in the decline of reservoir seepage capacity, which in turn affects the displacement efficiency and ultimate recovery factor of CO2 flooding.

Key words: CO2 flooding, acidification, nuclear magnetic resonance, influence mechanism, oil recovery

CLC Number: 

  • TE357
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