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Analysis of Flow Behavior for Acid Fracturing Wells in Fractured-Vuggy Carbonate Reservoirs

机译：缝隙碳酸盐岩储层酸压井流动特性分析

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摘要

This study develops a mathematical model for transient flow analysis of acid fracturing wells in fractured-vuggy carbonate reservoirs. This model considers a composite system with the inner region containing finite number of artificial fractures and wormholes and the outer region showing a triple-porosity medium. Both analytical and numerical solutions are derived in this work, and the comparison between two solutions verifies the model accurately. Flow behavior is analyzed thoroughly by examining the standard log-log type curves. Flow in this composite system can be divided into six or eight main flow regimes comprehensively. Three or two characteristic V-shaped segments can be observed on pressure derivative curves. Each V-shaped segment corresponds to a specific flow regime. One or two of the V-shaped segments may be absent in particular cases. Effects of interregional diffusivity ratio and interregional conductivity ratio on transient responses are strong in the early-flow period. The shape and position of type curves are also influenced by interporosity coefficients, storativity ratios, and reservoir radius significantly. Finally, we show the differences between our model and the similar model with single fracture or without acid fracturing and further investigate the pseudo-skin factor caused by acid fracturing.
机译：这项研究开发了一个数学模型，用于裂缝性碳酸盐岩储层中酸压井的瞬态流动分析。该模型考虑了一个复合系统，其内部区域包含有限数量的人工裂缝和虫洞，外部区域显示了三孔介质。这项工作都导出了解析解和数值解，并且两个解之间的比较准确地验证了模型。通过检查标准对数-对数类型曲线，可以对流动行为进行全面分析。该复合系统中的流动可以全面分为六个或八个主要流动状态。在压力导数曲线上可以观察到三个或两个特征性的V形段。每个V形段都对应一个特定的流态。在特定情况下，可能没有一个或两个V形段。区域间扩散率和区域间电导率对瞬态响应的影响在早期流动期中很强。类型曲线的形状和位置也受到孔隙率系数，储水率和储层半径的显着影响。最后，我们显示了我们的模型与类似模型之间的差异，该模型具有单裂缝或无酸裂缝的情况，并进一步研究了由酸裂缝引起的假皮肤因子。

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  • 来源
    《Mathematical Problems in Engineering》 |2018年第3期|6431910.1-6431910.20|共20页
  • 作者

    Wang Mingxian; Fan Zifei; Dong Xuyang; Song Heng; Zhao Wenqi; Xu Guoqing;

  • 作者单位

    PetroChina, Res Inst Petr Explorat & Dev, 20 Xueyuan Rd, Beijing 100083, Peoples R China;

    PetroChina, Res Inst Petr Explorat & Dev, 20 Xueyuan Rd, Beijing 100083, Peoples R China;

    China Univ Geosci, Sch Energy Resources, 29 Xueyuan Rd, Beijing 100083, Peoples R China;

    PetroChina, Res Inst Petr Explorat & Dev, 20 Xueyuan Rd, Beijing 100083, Peoples R China;

    PetroChina, Res Inst Petr Explorat & Dev, 20 Xueyuan Rd, Beijing 100083, Peoples R China;

    PetroChina, Res Inst Petr Explorat & Dev, 20 Xueyuan Rd, Beijing 100083, Peoples R China;

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