A vug porosity system, in addition to matrix, is also the target rocks for the acidizing. In this work, the acidizing process in two typical core-scale separate-vug porosity systems are studied in detail. Numerous cases are conducted to discuss a parametric study on the acidizing process and hydraulic behavior. Results indicate that the presence of vug reduces the pore volume of acid solution consumed to achieve a breakthrough, which is consistent with experimental observations. Increasing vug diameter and porosity decrease pore volume to breakthrough both for vugular carbonate rock and isolated vug carbonate rock. In comparison, acid mass does not change a lot. Typical dissolution patterns can also be observed in the acidizing process when vug exists. Compared to matrix dissolution patterns, the presence of vug induces wormhole to pass through the vug region.

中文翻译：

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孔洞碳酸盐岩酸化过程数值研究与分析

除基质外，孔洞孔隙度系统也是酸化的目标岩石。在这项工作中，详细研究了两个典型的岩心尺度分离孔洞孔隙度系统中的酸化过程。进行了大量案例来讨论酸化过程和水力行为的参数研究。结果表明，孔洞的存在减少了为实现突破而消耗的酸溶液的孔体积，这与实验观察一致。对于孔状碳酸盐岩和孤立孔状碳酸盐岩，增加孔洞直径和孔隙度会降低孔体积以突破。相比之下，酸质量变化不大。当孔洞存在时，在酸化过程中也可以观察到典型的溶解模式。与基质溶解模式相比，