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本研究向用于碳酸盐地层的水基压裂液中添加酸液,并通过模拟实际酸压条件,在实验室中进行了酸压裂缝导流能力试验,从而评价酸液的影响。通过模拟水力压裂过程中压裂液大部分沿裂缝流动、小部分滤失的流动方式,进行了一系列酸压导流能力测量试验。用这些酸压体系对印第安那石灰石和白云石进行了一系列实验,得到以下结果:①所产生的裂缝导流能力并不总随酸岩反应时间的延长而增强,实际上,对于一些酸体系来说,在更长的酸岩反应时间下,裂缝导流能力反而降低,这表明在酸压过程中存在最佳酸化时间;②用三种酸体系所测试的导流能力有很大的差别,在200?条件下,聚合物稠化酸与黏弹性表面活性剂转向酸比乳化酸体系所产生的导流能力更高;③实验室测量的这些裂缝导流能力与Nierode-Kruk经验关系式所预测的结果不一致。
In this study, the acid solution was added to the water-based fracturing fluid used in the carbonate formation, and the acid fracturing conductivity was tested in the laboratory by simulating the actual acid pressure conditions. A series of acid pressure conductivity tests were carried out by simulating the flow of most fracturing fluid along the fractures and the flow pattern of a small amount of fluid loss during hydraulic fracturing. A series of experiments on limestone and dolomite in Indiana were carried out by using these acid pressure systems. The following results were obtained: ① The induced fracture conductivity does not always increase with the time of acid rock reaction; in fact, for some acid systems For longer acid-rock reaction time, the fracture conductivity decreases, which indicates that there is an optimal acidification time in the acid pressure process. (2) There is a great difference in conductivity between the three acid systems , The flow conductivity of polymer viscosifying acid and viscoelastic surfactant is higher than that of emulsified acid system under the condition of 200;; ③ The laboratory measured conductivity of these fractures and Nierode-Kruk empirical relationship The predicted results are not consistent.