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对在碳酸盐地层中使用有机酸作为增产流体进行了讨论。像醋酸或甲酸等有机酸由于具有能延迟反应速率,腐蚀性低,在富含沥青质的原油中形成酸渣/油渣的趋势降低,因而多年以来一直作为盐酸的替代物使用。在委内瑞拉,实施有机酸增产作业时将有机酸以酸化压裂处理的形式泵送到深的、温度较高的石灰岩地层中。尽管所实施的酸压措施都很成功,但由于缺少有机酸/碳酸盐消耗模型而无法进行优化设计。本文推荐了一种有关酸消耗的新模型,它既适用于强酸、弱酸,同时也适用于混合酸。与现有的强酸(HCl)模型相比,增加了一项描述强酸与弱酸之间差异的酸电离常数。通过将模拟反应速率与使用旋转圆盘在实验室测定的实际反应速率相比较验证该模型。本文还通过有机酸的侵蚀裂缝的长度及宽度与强酸侵蚀裂缝的长度与宽度的比较,对酸压模拟结果进行了讨论。
The use of organic acids in carbonate formations as stimulation fluids is discussed. Organic acids such as acetic acid or formic acid have for many years been used as alternatives to hydrochloric acid for years because they have the potential to delay reaction rates, low corrosivity, and a reduced tendency to form sour / oil sludges in asphaltene-rich crudes. In Venezuela, organic acid production was pumped to deep, high temperature limestone formations in the form of acid fracturing treatment. Despite the success of the acid pressure measures implemented, the optimal design was not possible due to the lack of organic acid / carbonate consumption models. This article suggests a new model for acid consumption that is suitable for both strong and weak acids, but also for mixed acids. An acid ionization constant describing the difference between strong and weak acids is added compared to the existing strong acid (HCl) model. The model was verified by comparing the simulated reaction rate to the actual reaction rate measured in the laboratory using a rotating disk. In this paper, the simulation results of acid pressure are also discussed by comparing the length and width of the erosion crack with the length and width of the erosion crack.