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Volume 46 Issue 3
May  2024
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Article Navigation >  PETROLEUM GEOLOGY & EXPERIMENT  > 2024  >  46(3): 638-646
CHEN Hongcai, LI Zhe, JIN Zhongkang, SUN Yongpeng, CHEN Jun, ZHAO Guang. Microscopic characteristics of ultra-low permeability reservoirs in the Shigang Oilfield of the Subei Basin and strategies for enhancing oil recovery[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2024, 46(3): 638-646. doi: 10.11781/sysydz202403638
Citation: CHEN Hongcai, LI Zhe, JIN Zhongkang, SUN Yongpeng, CHEN Jun, ZHAO Guang. Microscopic characteristics of ultra-low permeability reservoirs in the Shigang Oilfield of the Subei Basin and strategies for enhancing oil recovery[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2024, 46(3): 638-646. doi: 10.11781/sysydz202403638
shu

Microscopic characteristics of ultra-low permeability reservoirs in the Shigang Oilfield of the Subei Basin and strategies for enhancing oil recovery

doi: 10.11781/sysydz202403638
  • 1.

    SINOPEC Jiangsu Oilfield Branch Company, Huaian, Jiangsu 211600, China

  • 2.

    School of Petroleum Engineering, China University of Petroleum (East China), Qingdao, Shandong 266580, China

  • Received Date: 2023-11-30
  • Rev Recd Date: 2024-03-28
  • Publish Date: 2024-05-28
    Abstract
  • The Shigang Oilfield in the Subei Basin is characterized by low-porosity and ultra-low permeability sandstone reservoirs. The natural productivity of the oil wells is low, but hydraulic fracturing followed by water injection can improve oil production capacity. However, during the development of the oilfield, problems such as low oil recovery rates, low recovery factors, and poor development effectiveness have become apparent, exacerbating development challenges. Therefore, it is necessary to identify the reasons for inefficient development and explore strategies to enhance recovery, providing a theoretical basis for improving the development effectiveness of the Shigang Oilfield. Using methods such as whole-rock mineral composition analysis, gas-measured core porosity and permeability parameters, and core sensitivity evaluation, the micro characteristics of the reservoir were analyzed in terms of rock mineral composition, pore-throat structure, and rock sensitivity. Numerical reservoir simulations and laboratory core experiments were conducted to study the distribution characteristics of residual oil after fracturing water flooding. Strategies to enhance oil recovery were investigated through nuclear magnetic resonance online displacement experiments. The results showed that the reservoir cores exhibited typical low-porosity and ultra-low permeability characteristics, with certain velocity sensitivity and water sensitivity during development. After fracturing water flooding, residual oil in the cores was mainly distributed in pore channels with diameters ranging from 0.01 to 1 μm. The use of surfactant flooding and secondary water flooding increased the recovery rate of residual oil in the cores by 14.81%. The main reasons for inefficient development included ultra-low reservoir permeability, the development of micro pores and micro fractures, and sensitivity to velocity and water. Water injection development could cause rock mineral swelling and migration, increasing flow resistance. Therefore, after fracturing water flooding, only the recovery of residual oil along the main flow paths was significantly improved, with the overall utilization degree remaining low, and a considerable amount of residual oil still concentrated in the reservoir. It is recommended to use chemical flooding and multiple rounds of displacement to enhance the utilization of oil in medium and small pore channels, further improving the development effectiveness of the oilfield.

     

    • All authors disclose no relevant conflict of interests.
    CHEN Hongcai participated in experimental design, article writing and revision. LI Zhe completed experimental operation and participated in the writing and revision of the article. JIN Zhongkang provided core and field data, and put forward suggestions for revision. SUN Yongpeng participated in experimental design and article revision. CHEN Jun proposed amendments and participated in the revision of the article. ZHAO Guang participated in the structural design of the article and put forward suggestions for revision. All authors have read the last version of the paper and consented to its submission.
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