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Deep carbonate reservoirs in the Sichuan Basin generally have the characteristics of uneven development of natural fractures, complex lithology, and strong heterogeneity. For such reservoirs, acid fracturing is a commonly used stimulation and transformation measure. Among them, the conductivity of acid etched fractures is a key factor affecting the effectiveness of acid fracturing. In this paper, the rock mineral composition experiment is carried out to select cores with different proportions of dolomite, and the conductivity experiment of acid erosion fractures is carried out to obtain the variation rule of acid erosion fracture conductivity of different lithologic components. The experimental results show that with the increase of dolomite content, the reaction rate of acid rock decreases and the conductivity increases. Under the same lithology ratio, compared with the single acid injection process, the acid rock reaction rate of the alternating injection process is lower, the effective action distance and the conductivity are higher. Acid erosion can greatly improve the conductivity of rock slab, and the conductivity is the highest after acid erosion, the reaction rate of acid rock with authigenic acid + gelling acid is the slowest, and the effective action distance is the longest. In summary, for high-temperature reservoirs with simultaneous development of dolomite and limestone, the reservoir renovation process should prioritize the use of cooling measures to reduce the difference in acid rock reaction rate of dolomite. For reservoirs with low cloud rock content, in order to avoid a large amount of acid consumption in the dissolution limestone section, it is necessary to slow down the reaction rate, extend the effective working distance, and fully communicate the reservoir fractures and cavities; For reservoirs with high cloud rock content, it is necessary to increase non-uniform etching and acid rock reaction rate while maintaining a certain effective working distance, in order to further improve the conductivity.

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Research on the Extension Mechanism and Renovation Process of Acid Etched Fractures in Highly Heterogeneous Reservoirs

  • 会议论文

  • 发表日期：

    2025年

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  • Jin-sui Li,
  • Li Li,
  • Zhou-yang Wang,
  • Ting-ting He,
  • Miao Yang,
  • Yan Fu,
  • Yu-cheng Jia,
  • Wei Chen

摘要

Deep carbonate reservoirs in the Sichuan Basin generally have the characteristics of uneven development of natural fractures, complex lithology, and strong heterogeneity. For such reservoirs, acid fracturing is a commonly used stimulation and transformation measure. Among them, the conductivity of acid etched fractures is a key factor affecting the effectiveness of acid fracturing. In this paper, the rock mineral composition experiment is carried out to select cores with different proportions of dolomite, and the conductivity experiment of acid erosion fractures is carried out to obtain the variation rule of acid erosion fracture conductivity of different lithologic components. The experimental results show that with the increase of dolomite content, the reaction rate of acid rock decreases and the conductivity increases. Under the same lithology ratio, compared with the single acid injection process, the acid rock reaction rate of the alternating injection process is lower, the effective action distance and the conductivity are higher. Acid erosion can greatly improve the conductivity of rock slab, and the conductivity is the highest after acid erosion, the reaction rate of acid rock with authigenic acid + gelling acid is the slowest, and the effective action distance is the longest. In summary, for high-temperature reservoirs with simultaneous development of dolomite and limestone, the reservoir renovation process should prioritize the use of cooling measures to reduce the difference in acid rock reaction rate of dolomite. For reservoirs with low cloud rock content, in order to avoid a large amount of acid consumption in the dissolution limestone section, it is necessary to slow down the reaction rate, extend the effective working distance, and fully communicate the reservoir fractures and cavities; For reservoirs with high cloud rock content, it is necessary to increase non-uniform etching and acid rock reaction rate while maintaining a certain effective working distance, in order to further improve the conductivity.