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A Microfluidic Experiment on CO 2 Injection for Enhanced Oil Recovery in a Shale Oil Reservoir with High Temperature and Pressure

Author

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  • Zhengdong Lei

    (Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China)

  • Yishan Liu

    (Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China)

  • Rui Wang

    (Exploration and Development Research Institute of Daqing Oilfield, Daqing 163412, China)

  • Lei Li

    (College of Petroleum Engineering, China University of Petroleum, Qingdao 266580, China)

  • Yuqi Liu

    (Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China)

  • Yuanqing Zhang

    (Exploration and Development Research Institute of Daqing Oilfield, Daqing 163412, China)

Abstract

In recent years, CO 2 huff and puff has become one of the most important methods developed for unconventional shale oil reservoirs and has been widely used in all major shale oil fields. However, the microscopic mechanism of CO 2 contacting with crude oil is complex, and the change law of the residual oil occurrence after CO 2 injection is unclear. In this paper, a micro visualization fluid flow simulation experiment (microfluidic experiment) under high temperatures and high pressure of a shale reservoir was conducted to reveal the micro mechanism of CO 2 and crude oil after contact at the microscale. This allows conclusion of more precise results than any experiment conducted in a room environment. Combined with gas–oil two-phase micro flow characteristics, the production mechanisms of crude oil by CO 2 huff and puff at the pore scale are clarified, and the change characteristics of the remaining oil occurrence state after CO 2 injection are quantified. The results show that CO 2 mainly produces crude oil in macropores and microfractures in the injection stage of huff and puff, improves the mobility of crude oil through diffusion dissolution in the soaking stage, and that the driving of dissolved gas is dominant in depressurization production. The major micro-mechanisms for CO 2 to improve shale oil are extraction and dissolution expansion, accompanied by a variety of secondary mechanisms, such as the miscibility effect, oil expansion, viscosity reduction and other contact effects, as well as the improvement of crude oil properties. The simulation results of huff and puff development show that soaking is an important stage to enhance oil recovery. With increasing soaking time or the soaking pressure, the recovery degree of crude oil will increase positively.

Suggested Citation

  • Zhengdong Lei & Yishan Liu & Rui Wang & Lei Li & Yuqi Liu & Yuanqing Zhang, 2022. "A Microfluidic Experiment on CO 2 Injection for Enhanced Oil Recovery in a Shale Oil Reservoir with High Temperature and Pressure," Energies, MDPI, vol. 15(24), pages 1-15, December.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:24:p:9461-:d:1003088
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    References listed on IDEAS

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    1. Kun Qian & Shenglai Yang & Hongen Dou & Qian Wang & Lu Wang & Yu Huang, 2018. "Experimental Investigation on Microscopic Residual Oil Distribution During CO 2 Huff-and-Puff Process in Tight Oil Reservoirs," Energies, MDPI, vol. 11(10), pages 1-16, October.
    2. Jianhong Zhu & Junbin Chen & Xiaoming Wang & Lingyi Fan & Xiangrong Nie, 2021. "Experimental Investigation on the Characteristic Mobilization and Remaining Oil Distribution under CO 2 Huff-n-Puff of Chang 7 Continental Shale Oil," Energies, MDPI, vol. 14(10), pages 1-18, May.
    3. Xiangwen Kong & Hongjun Wang & Wei Yu & Ping Wang & Jijun Miao & Mauricio Fiallos-Torres, 2021. "Compositional Simulation of Geological and Engineering Controls on Gas Huff-n-Puff in Duvernay Shale Volatile Oil Reservoirs, Canada," Energies, MDPI, vol. 14(8), pages 1-32, April.
    4. Ganggang Hou & Xiaoli Ma & Wenyue Zhao & Pengxiang Diwu & Tongjing Liu & Jirui Hou, 2021. "Synergistic Modes and Enhanced Oil Recovery Mechanism of CO 2 Synergistic Huff and Puff," Energies, MDPI, vol. 14(12), pages 1-30, June.
    5. Khaled Enab & Hamid Emami-Meybodi, 2021. "Effects of Diffusion, Adsorption, and Hysteresis on Huff-n-Puff Performance in Ultratight Reservoirs with Different Fluid Types and Injection Gases," Energies, MDPI, vol. 14(21), pages 1-17, November.
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    Cited by:

    1. Zhenhua Xu & Lianwu Zhou & Shuiping Ma & Jianxun Qin & Xiaodi Huang & Bo Han & Longqing Yang & Yun Luo & Pengcheng Liu, 2023. "Study on CO 2 Huff-n-Puff Development Rule of Horizontal Wells in Heavy Oil Reservoir by Taking Liuguanzhuang Oilfield in Dagang as an Example," Energies, MDPI, vol. 16(11), pages 1-13, May.

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