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LI Fengxia, WANG Haibo, ZHOU Tong, HAN Ling. The Influence of Fractures in Shale Oil Reservoirs on CO2 Huff and Puff and Its Pore Production Characteristics[J]. Petroleum Drilling Techniques, 2022, 50(2): 38-44. DOI: 10.11911/syztjs.2022006
Citation: LI Fengxia, WANG Haibo, ZHOU Tong, HAN Ling. The Influence of Fractures in Shale Oil Reservoirs on CO2 Huff and Puff and Its Pore Production Characteristics[J]. Petroleum Drilling Techniques, 2022, 50(2): 38-44. DOI: 10.11911/syztjs.2022006
shu

The Influence of Fractures in Shale Oil Reservoirs on CO2 Huff and Puff and Its Pore Production Characteristics

  • 1.

    Sinopec Petroleum Exploration and Production Research Institute, Beijing, 102206, China

  • 2.

    Research Institute of Petroleum Engineering, Sinopec Jianghan Oilfield Company, Wuhan, Hubei, 430035, China

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  • Received Date: August 04, 2021
  • Revised Date: December 26, 2021
  • Available Online: February 13, 2022
    Graphical Abstract
    • Abstract
  • To study the influence of fractures from shale hydraulic fracturing on the CO2 huff and puff, low-field nuclear magnetic resonance was adopted in CO2 huff and puff experiments with shales of different permeabilities, and the influence of fractures on the CO2 huff and puff effect in reservoirs of different permeabilities was investigated. Experimental results show that fractures significantly improve the oil production rate and recovery at the initial stage of the CO2 huff and puff operations. However, the influence of fractures on the recovery gradually decreases as huff and puff continues and the permeability increases. The influence of permeability on huff and puff of fractured cores is much lower than that of unfractured cores, which indicates that fractures may reduce the influence of permeability on recovery by CO2 huff and puff. With continuing huff and puff, the increase rate in the degree of reserve recovery of crude oil from macropores contributed by fractures declines while that of crude oil from micropores increases. Despite this finding, macropores continued to be the main contributor of crude oil production. The results indicate that the quick and high production of crude oil from macropores mainly depends on volume expansion and dissolved gas drive. In contrast, the slow and low production of crude oil from micropores is primarily brought by extraction and mass transfer. The results of this study have provided a theoretical basis for evaluating the characteristics of oil production from fractured reservoirs and improving production performance.
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