EXPERIMENTAL STUDY OF MULTI-SCALE REACTION BETWEEN ACID AND ROCK IN ACID FRACTURING
EXPERIMENTAL STUDY OF MULTI-SCALE REACTION BETWEEN ACID AND ROCK IN ACID FRACTURING
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发表时间：
2010
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通讯作者：
Sinopec Exploration
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作者：
Sinopec Exploration
以往的酸岩反应研究多为单一尺度，缺乏多尺度研究，采用正交实验方法，设计并进行了9个四川二叠系长兴组灰岩颗粒的酸蚀实验，从实验结果出发，探讨了主酸浓度、酸蚀作用对宏观反应速率的影响最大的是酸的种类，其次是主酸浓度;酸蚀作用会使扫描电镜观察到的岩石细观结构如孔隙、裂隙、表面形貌等发生不同程度的变化，即碳酸盐岩的细观侵蚀机制是多种多样的。前人总结的“连通裂隙、扩张孔喉”只是灰岩细观侵蚀机理的特例，当涉及到不同尺度反应性质之间的关系时，宏观反应速率与细观反应机理之间并没有明显的相关性。
Most of previous researches about acid/rock reaction are single scale and lack of multi-scale investigations.With orthogonal experiment method,nine acid erosion experiments of limestone particles,obtained from Changxing Formation of Permian in Sichuan Province,were designed and carried out.From the experiments result,it is discussed that the macroscopical reaction rate and mesoscopic reaction mechanism,which are influenced by four factors such as main acid concentration,temperature,reaction duration and acid type.The macroscopical reaction rate is most greatly affected by acid type,which is followed by main acid concentration.The rock mesoscopic structures observed by scanning electron microscope,such as pores,fractures and surfaces patterns,may be variously changed by acid erosion.In other words,there are various mesoscopic erosion mechanisms of carbonate rock."communicating fractures and expanding pore throat",summarized by previous researchers,is only a special case of mesoscopic erosion mechanism of limestone.When it comes to the relationship of different scale reaction properties,there is no obvious correlation between macroscopical reaction rate and mesoscopic reaction mechanism.