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<p>Massive liquid injection is an effective energy replenishment method based on optimizing flow channels. However, the microscopic flow mechanism underlying massive flooding and massive soaking is not fully understood, and the influence characteristics of key injection-production factors on oil recovery remains unclear. Therefore, nuclear magnetic resonance (NMR) was employed to investigate the mass transfer process and microscopic flow mechanism of massive flooding and soaking. The impact of injection methods, injection liquids, fracture development, and displacement pressure differences was analyzed using the quantitative method. The performance of combination between massive flooding and soaking was also discussed. The findings indicate that the mass transfer rate and volume of oil and water between opened microfractures and matrix increase significantly during massive flooding, resulting in a minimum 9.65% higher recovery degree to conventional injection conditions. Macropores dominate oil drainage, and micropores experience a dynamic competitive phenomenon between oil backflow and recovery. The addition of surfactants slightly increases the oil recovery in micropores. Massive soaking transforms from dynamic imbibition dominated by macropores to static imbibition dominated by micropores along with soaking time, improving overall recovery by 4.63% compared to spontaneous conditions. Recovery speed is 4.56 times that of spontaneous conditions. The primary interaction target varies with surfactant properties. The combination of massive flooding and soaking takes full advantage of the two modes to enhance the oil recovery of full-scale pores.</p>

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Microscopic flow mechanism considering the mechanical response on massive energy replenishment in tight oil reservoirs

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年1月11日

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  • Zhuoying Dou,
  • Zhengming Yang,
  • Changchun Dong,
  • Haibo Li,
  • Yimeng Wang,
  • Chenyu Han,
  • Huan Meng

摘要

Massive liquid injection is an effective energy replenishment method based on optimizing flow channels. However, the microscopic flow mechanism underlying massive flooding and massive soaking is not fully understood, and the influence characteristics of key injection-production factors on oil recovery remains unclear. Therefore, nuclear magnetic resonance (NMR) was employed to investigate the mass transfer process and microscopic flow mechanism of massive flooding and soaking. The impact of injection methods, injection liquids, fracture development, and displacement pressure differences was analyzed using the quantitative method. The performance of combination between massive flooding and soaking was also discussed. The findings indicate that the mass transfer rate and volume of oil and water between opened microfractures and matrix increase significantly during massive flooding, resulting in a minimum 9.65% higher recovery degree to conventional injection conditions. Macropores dominate oil drainage, and micropores experience a dynamic competitive phenomenon between oil backflow and recovery. The addition of surfactants slightly increases the oil recovery in micropores. Massive soaking transforms from dynamic imbibition dominated by macropores to static imbibition dominated by micropores along with soaking time, improving overall recovery by 4.63% compared to spontaneous conditions. Recovery speed is 4.56 times that of spontaneous conditions. The primary interaction target varies with surfactant properties. The combination of massive flooding and soaking takes full advantage of the two modes to enhance the oil recovery of full-scale pores.