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<p>During the development of gas reservoirs with water, water invades the reservoir along preferential pathways, trapping a large amount of residual gas in the reservoir. Research on the distribution of residual gas after water invasion is crucial for further exploitation of the gas reservoir. Based on 50 core samples from the loose sandstone reservoir of the Sebei gas field, single-core water flooding gas experiments (20 samples) and parallel-core water flooding gas experiments (15 groups) were conducted under reservoir conditions (15&#xa0;MPa, 40&#xa0;°C) to study the effect of permeability difference on the distribution of residual gas. The results showed that: (1) The higher the permeability, the lower the residual gas saturation. When the permeability is less than 4mD, the residual gas saturation is greater than 40%, indicating a focus area of water trapping gas. When the permeability is greater than 15mD, the change in permeability has a minor effect on the residual gas saturation, which is less than 30%. (2) The influence of the permeability ratio on the distribution of residual gas can be categorized into key water seal area (permeability ratio &gt; 15), water trapping zone (6 &lt; permeability ratio &lt; 23) and no influence zone (permeability ratio &lt; 6). (3) After water invasion, the residual gas mainly distributes in the region with permeability less than 4mD and permeability ratio greater than 15. The experimental results can provide technical support for the study of the distribution of residual gas in similar reservoirs and the optimal selection of potential gas reservoir areas.</p>

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Experimental Study on Permeability Differences and Residual Gas Distribution in Loose Sandstone Reservoirs

  • 期刊论文

  • 发表日期：

    2025年1月3日

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  • Xiao-Hua Tan,
  • Hang Zhang,
  • Yu Zhao,
  • Hui-Yu Zhang,
  • Hong-Kui Ma,
  • Qi Jiang,
  • Shi-Jun Ren,
  • Dan-Dan Ma

摘要

During the development of gas reservoirs with water, water invades the reservoir along preferential pathways, trapping a large amount of residual gas in the reservoir. Research on the distribution of residual gas after water invasion is crucial for further exploitation of the gas reservoir. Based on 50 core samples from the loose sandstone reservoir of the Sebei gas field, single-core water flooding gas experiments (20 samples) and parallel-core water flooding gas experiments (15 groups) were conducted under reservoir conditions (15 MPa, 40 °C) to study the effect of permeability difference on the distribution of residual gas. The results showed that: (1) The higher the permeability, the lower the residual gas saturation. When the permeability is less than 4mD, the residual gas saturation is greater than 40%, indicating a focus area of water trapping gas. When the permeability is greater than 15mD, the change in permeability has a minor effect on the residual gas saturation, which is less than 30%. (2) The influence of the permeability ratio on the distribution of residual gas can be categorized into key water seal area (permeability ratio > 15), water trapping zone (6 < permeability ratio < 23) and no influence zone (permeability ratio < 6). (3) After water invasion, the residual gas mainly distributes in the region with permeability less than 4mD and permeability ratio greater than 15. The experimental results can provide technical support for the study of the distribution of residual gas in similar reservoirs and the optimal selection of potential gas reservoir areas.