Abstract: Dux-ing acidfracturing, the fracture geometry (mainly width) is closely related to temperature and concentration profile of the acid in the fracture. So how to calculate the grometry of the fracture is important. Formerly some people considered the pad and acid used have the same ability to create the fracture, using the total volume of pad and acid as a single fluid to calculate the geometry of fracture (here we called this single fluid system method) and the calculation of other parameters of acidfracturing is based an this idea. But in fact, during fractzxring, viscous pad fluid is pumped firstly and then followed by the comparatively low viscous acid fluid. These two kinds of fluids have different ability to create the fracture. Basing an this point we investigate a new fracture geometry calcu lotion method for what we called the double-fluid system. We compare these two calculation methods. The calculation result given by the double-fluid system znethocl is narrow in width and low in acid Concentration.

摘要： 酸压中裂缝儿何尺寸(主要是缝宽)对酸液在缝中的温度与浓度分布有密切系,如何计算酸压的裂缝儿何尺寸就很重要,过去有些作者将先后注入的前置液与酸液视为起相同作用的造缝液体来计算裂缝几何尺寸(本文称之为单液系统法)酸压其他参数的计算都是在这种认识的基础上进行的,事实上在酸压过程中先注人的稠粘前置液与后注人的较稀酸液,具有不同的造缝能力,在这个基础上本文建立了双液系统裂缝几何尺寸的计算方法,计算结果说明双液系统法计算出的裂缝宽度较单液法为窄,酸浓度也较低。