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综述了稠油热采过程高温高压条件下水-岩反应的3种研究方法,即岩心分析法、实验室模拟法以及流体化学成分研究法;不同温度条件下储层粘土矿物的转化过程及途径不同,即在注汽井井眼附近储层中粘土矿物向膨胀性蒙皂石转化,在远离井眼地区储层中粘土矿物向其它类型矿物发生转化;以及粘土矿物发生转化的2种结构模式-溶解、沉淀型模式和继承型模式。最后探讨了高温高压条件下粘土矿物发生转化的影响因素。改变这些影响因素可使粘土矿物向着将储层伤害降低至最小的方向发生转化,有利于稠油储层保护和提高热采效率。
Three kinds of research methods of water-rock reaction under the condition of high temperature and high pressure, such as core analysis method, laboratory simulation method and fluid chemical composition research method, are summarized in this paper. The conversion process and route of clay minerals under different temperature conditions are different That is, the conversion of clay minerals to swellable smectites in reservoirs near the steam injection wellbore and the conversion of clay minerals to other types of minerals in reservoirs located far away from the borehole; and two structural patterns of clay mineral transformation - Dissolve, Precipitation and Inheritance modes. Finally, the influencing factors of clay mineral transformation under high temperature and high pressure were discussed. Changing these influencing factors can convert clay minerals into the direction of minimizing reservoir damage, which is beneficial to the protection of heavy oil reservoirs and the improvement of thermal recovery efficiency.