Abstract
The mineral composition and content distribution of carbonate rocks in QiXia reservoir formation and porosity and permeability parameters at different acidification time are measured by laboratory experiments. The dynamic changes of pore pressure and borehole wall seepage field during acid fracturing process were simulated by software, the results show that acidification has a significant effect on the porosity and permeability characteristics. The porosity increases as a whole and there are differences in permeability changes. During the production process after acid fracturing, pore pressure relief in the borehole wall varies with the different drawdown pressure. The conductivity of crack seepage is significantly higher than that of base rock. The higher the drawdown pressure is, the greater the crack pore pressure relief, and the larger the reduction range and the influence area of the pore pressure around the well will be. The conductivity of acid fracturing crack is higher than that of the reservoir base rock, and the permeability of matrix is weak. The higher the drawdown pressure difference is, the higher the decreasing amplitude of pore pressure around acid fracturing cracks is, the faster the pressure relief speed is, and the larger the influence area is.
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Cui, S., Liu, H., Liu, T., Yu, A., Han, X. (2020). The Study on the Influence of Acidification on the Pore and Seepage Field of Carbonate Reservoir. In: Okada, H., Atluri, S. (eds) Computational and Experimental Simulations in Engineering. ICCES 2019. Mechanisms and Machine Science, vol 75. Springer, Cham. https://doi.org/10.1007/978-3-030-27053-7_16
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DOI: https://doi.org/10.1007/978-3-030-27053-7_16
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