新疆石油地质

新疆石油地质 ›› 2017, Vol. 38 ›› Issue (zk(English) ): 85-89.

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Microscopic Damage Mechanism of Asphaltene Deposition on Cores during CO2 Flooding

WANG Chen1,2, LI Tiantai2, GAO Hui2, ZHAO Jinsheng2, GAO Yuan3, DOU Liangbin2   

  1. 1. School of Petroleum Engineering, China University of Petroleum, Beijing 102249, China;
    2. School of Petroleum Engineering, Xi'an Shiyou University, Xi'an, Shaanxi 710065, China;
    3. Shaanxi Gas Group Co. Ltd, Xi'an, Shaanxi 710016, China
  • 收稿日期:2017-06-06 修回日期:2017-07-24 出版日期:2018-01-01 发布日期:2021-05-19

Microscopic Damage Mechanism of Asphaltene Deposition on Cores during CO2 Flooding

WANG Chen1,2, LI Tiantai2, GAO Hui2, ZHAO Jinsheng2, GAO Yuan3, DOU Liangbin2   

  1. 1. School of Petroleum Engineering, China University of Petroleum, Beijing 102249, China;
    2. School of Petroleum Engineering, Xi'an Shiyou University, Xi'an, Shaanxi 710065, China;
    3. Shaanxi Gas Group Co. Ltd, Xi'an, Shaanxi 710016, China
  • Received:2017-06-06 Revised:2017-07-24 Online:2018-01-01 Published:2021-05-19
  • About author:WANG Chen,E-mail: cwangxsyu@163.com

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摘要： In order to study microscopic damage mechanism of asphaltene deposition on reservoirs with different permeabilities during CO2 flooding, cores with high, medium and low permeabilities are selected for indoor CO2 flooding experiments and plugging degree of pore throat in cores are analyzed quantitatively by using NMR technology. The experimental results show that the deposition rate of asphaltene during miscible flooding stage is obviously higher than that during immiscible flooding stage, and the deposition rates are basically same in the cores with different permeabilities; permeability damage rate is positively correlated with the asphaltene deposition rate and the larger the core permeability, the smaller the permeability damage rate; the pore throats in low permeability cores are blocked seriously with the plugging rate of relatively smaller pore throats (0.01~1 ms) reaching 38.19%, the plugging rate of relatively smaller pore throats tin high permeability cores is only 9.59%, which is significantly lower than the previous one.

关键词: CO2 flooding, asphaltene deposition, microscopic damage mechanism, pore throat plugging rate, permeability damage rate, NMR technology

Abstract: In order to study microscopic damage mechanism of asphaltene deposition on reservoirs with different permeabilities during CO2 flooding, cores with high, medium and low permeabilities are selected for indoor CO2 flooding experiments and plugging degree of pore throat in cores are analyzed quantitatively by using NMR technology. The experimental results show that the deposition rate of asphaltene during miscible flooding stage is obviously higher than that during immiscible flooding stage, and the deposition rates are basically same in the cores with different permeabilities; permeability damage rate is positively correlated with the asphaltene deposition rate and the larger the core permeability, the smaller the permeability damage rate; the pore throats in low permeability cores are blocked seriously with the plugging rate of relatively smaller pore throats (0.01~1 ms) reaching 38.19%, the plugging rate of relatively smaller pore throats tin high permeability cores is only 9.59%, which is significantly lower than the previous one.

Key words: CO2 flooding, asphaltene deposition, microscopic damage mechanism, pore throat plugging rate, permeability damage rate, NMR technology