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Mine Engineering 2023
基于嵌入式离散裂缝模型的裂缝型碳酸盐岩反应流数值模拟
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Abstract:
酸化是碳酸盐岩储层中常采用的改造措施。在裂缝型碳酸盐岩储层中，由于天然裂缝的渗透率较高，注入酸可以沿着裂缝深入地层，增加了活酸作用距离。但是在当前的酸化反应流模型中，对于储层中的复杂裂缝尚不能高效处理。为解决这一问题，本文建立了裂缝型碳酸盐岩酸化反应流数学模型。然后基于嵌入式离散裂缝模型对所建模型进行数值求解，将裂缝系统与基岩系统单独进行网格划分，并分析裂缝对蚓孔生长动态的影响。研究结果表明，天然裂缝的存在并不能改变酸蚀蚓孔生成的溶蚀模式以及岩心酸化时的最优注入速度，但能够改变形成的蚓孔结构形态，使突破岩心时所需酸液的体积减少。
Acidification is a retrofitting measure used in carbonate reservoirs. In fractured carbonate reser-voirs, due to the high permeability of natural fractures, acid injection can penetrate into the for-mation along the fractures, increasing the active acid action distance. However, in the current acidizing reaction flow model, complex fractures in the reservoir cannot be treated efficiently. In order to solve this problem, a mathematical model of acidizing reaction flow in fractured carbonate rocks is established. Then, based on the embedded discrete fracture model, the model is solved numerically, and the fracture system and the bedrock system are meshed separately, and the influence of the fracture on the growth dynamics of the wormhole is analyzed. The results show that the existence of natural fractures does not change the dissolution patterns of wormhole formation and the optimal injection rate during core acidification, but it can change the structure and morphology of wormhole formation and reduce the volume of acid solution required for core breakthrough.
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