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Micro-Displacement and Storage Mechanism of CO 2 in Tight Sandstone Reservoirs Based on CT Scanning

Author

Listed:
  • Ping Yue

    (State Key Laboratory of Reservoir Geology and Development, Southwest Petroleum University, Chengdu 610500, China)

  • Feng Liu

    (School of Petroleum Engineering, Xi’an Shiyou University, Xi’an 710065, China)

  • Kai Yang

    (School of Petroleum Engineering, Xi’an Shiyou University, Xi’an 710065, China)

  • Chunshuo Han

    (School of Petroleum Engineering, Xi’an Shiyou University, Xi’an 710065, China)

  • Chao Ren

    (Changqing Oilfield Company, Petro China, Xi’an 710018, China)

  • Jiangtang Zhou

    (Changqing Oilfield Company, Petro China, Xi’an 710018, China)

  • Xiukun Wang

    (Institute of Unconventional Oil and Gas Science and Technology, China University of Petroleum (Beijing), Beijing 102249, China)

  • Quantang Fang

    (State Key Laboratory of Reservoir Geology and Development, Southwest Petroleum University, Chengdu 610500, China)

  • Xinxin Li

    (Changqing Engineering Design Co., Ltd., Petro China, Xi’an 710018, China)

  • Liangbin Dou

    (School of Petroleum Engineering, Xi’an Shiyou University, Xi’an 710065, China)

Abstract

Tight sandstone reservoirs are ideal locations for CO 2 storage. To evaluate the oil displacement efficiency and storage potential of CO 2 in the tight sandstone reservoir in the Huang 3 area of the Changqing Oilfield, four kinds of displacement experiments were conducted on core samples from the Chang 8 Formation in the Huang 3 area. These experiments were performed using micro-displacement equipment, digital core technology, and an online CT scanning system; the different oil displacement processes were recorded as three-dimensional images. The results show that the CO 2 flooding alternated with water scheme can improve crude oil recovery the most. Comparing the cores before and after the displacement shows that the amount of crude oil in pores with larger sizes decreases more. The remaining oil is mainly in thin films or is dispersed and star-shaped, indicating that the crude oil in the medium and large pores is swept and recovered. The CO 2 displacement efficiency is 41.67~55.08%, and the CO 2 storage rate is 38.16~46.89%. The proportion of remaining oil in the throat of the small and medium-sized pores is still high, which is the key to oil recovery in the later stages.

Suggested Citation

  • Ping Yue & Feng Liu & Kai Yang & Chunshuo Han & Chao Ren & Jiangtang Zhou & Xiukun Wang & Quantang Fang & Xinxin Li & Liangbin Dou, 2022. "Micro-Displacement and Storage Mechanism of CO 2 in Tight Sandstone Reservoirs Based on CT Scanning," Energies, MDPI, vol. 15(17), pages 1-16, August.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:17:p:6201-:d:898077
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    References listed on IDEAS

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    3. Gunde, Akshay C. & Bera, Bijoyendra & Mitra, Sushanta K., 2010. "Investigation of water and CO2 (carbon dioxide) flooding using micro-CT (micro-computed tomography) images of Berea sandstone core using finite element simulations," Energy, Elsevier, vol. 35(12), pages 5209-5216.
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