Oil production in recent years decreases due to clay migration and the formation of wax and gel asphalt scales.

由于粘土运移及蜡和胶质沥青质垢的生成，近年来油井产量逐年下降。

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The damage during hydraulic fracturing mainly included clay swelling and grain migration, built up created by mechanical impurities, the damage of fracture conductivity and so on.

水力压裂过程中存在的损害主要包括粘土膨胀与颗粒运移损害、机械杂质引起堵塞损害、支撑裂缝导流能力的损害等。

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This study provides an important basis for further research on the micro dynamic mechanism of clay mineral swelling, disgregation and migration.

得到了一些十分重要的新认识，为进一步研究黏土矿物膨胀、分散、运移微观动力学机制提供了重要依据。

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