砂岩储层酸压酸液有效作用距离数学模型研究

Research on Mathematic Models of Effective Acid Penetration Distance in Sandstone Reservoir Acid Fracturing

考虑盐酸对氢氟酸溶蚀砂岩矿物的催化作用,在碳酸盐岩酸压浓度模型的基础上,结合砂岩储层矿物酸岩反应的特点,建立了砂岩储层酸压酸液浓度分布模型,给出了求解酸浓度分布的全隐式数值计算方法。计算结果表明,该模型较为准确地模拟了裂缝中氢氟酸的浓度分布,为施工参数设计和施工效果预测提供了依据。

The effective acid penetration distance is an important parameter for acid fracture design in sandstone reservoir. Considering the hydrochloric acid catalytic action for sandstone mineral and based on considering acid fracturing fluid’s concentration as well as combining with the reaction character of sandstone reservoir, acid fracturing fluid’s concentration distribution model in sandstone reservoir is developed in this paper and the solution is developed too. The calculation result shows that model can simulate exactly the hydrofluoric acid concentration distribution in fracture, and provide guidance for designing the operation parameters and forecasting the construction effect.