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This study addresses the challenges of low oil saturation and complex oil-water relationships in the Chang 8 sandstone reservoirs of the Pingliang North area. Three fracturing fluid systems are evaluated using nuclear magnetic resonance (NMR) technology, along with experimental and theoretical analyses of imbibition and relative permeability: two newly developed systems (nano-amphiphile and nano-emulsion NFH-7) and a traditional guar system. The crude oil utilization effects of two pure surfactant systems are also assessed. Results indicate that low oil saturation is the primary factor affecting crude oil utilization. The nano-emulsion NFH-7 is identified as an effective oil utilization system, significantly altering the wettability of the core to a water-wet state. This change effectively reduces residual oil saturation and facilitates simultaneous crude oil utilization in micropores and nanopores. Experimental data confirm that NFH-7 can stably and effectively exert its imbibition effect at both room and reservoir temperatures. These findings provide a new strategy for developing reservoirs with low permeability and low oil saturation, demonstrating the potential application of NFH-7 as an alternative fracturing fluid system to enhance oil recovery.

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Comparative Study on the Performance of Crude Oil Utilization Agents in Low Oil Saturation Reservoir

  • 会议论文

  • 发表日期：

    2026年

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  • Xiaoyong Wen,
  • Hao Bai,
  • Zhiwen Li,
  • Xinlei Liu,
  • Chengwang Wang,
  • Erdong Yao,
  • Xiaogang Yang,
  • Fujian Zhou

摘要

This study addresses the challenges of low oil saturation and complex oil-water relationships in the Chang 8 sandstone reservoirs of the Pingliang North area. Three fracturing fluid systems are evaluated using nuclear magnetic resonance (NMR) technology, along with experimental and theoretical analyses of imbibition and relative permeability: two newly developed systems (nano-amphiphile and nano-emulsion NFH-7) and a traditional guar system. The crude oil utilization effects of two pure surfactant systems are also assessed. Results indicate that low oil saturation is the primary factor affecting crude oil utilization. The nano-emulsion NFH-7 is identified as an effective oil utilization system, significantly altering the wettability of the core to a water-wet state. This change effectively reduces residual oil saturation and facilitates simultaneous crude oil utilization in micropores and nanopores. Experimental data confirm that NFH-7 can stably and effectively exert its imbibition effect at both room and reservoir temperatures. These findings provide a new strategy for developing reservoirs with low permeability and low oil saturation, demonstrating the potential application of NFH-7 as an alternative fracturing fluid system to enhance oil recovery.