利用微观模型研究固体颗粒堵塞伤害机理

Study on damage mechanism of solid particle plugging by microvisual model

利用刻蚀玻片微观技术研究固体颗粒侵入孔道产生伤害的机理。实验数据显示,相同驱替压力停泵后的渗流速度相对减小,说明模型中的流体渗流需要一定的启动压力。通过对渗流空间、渗流体系受力和含水饱和度的分析,认为固体颗粒堵塞伤害机理为渗流空间缩小,导致绝对渗透率降低;渗流动力减小、含水饱和度增大造成相对渗透率降低。

This paper studies and analyzes on the damage mechanism of solid particle plugging by microvisual technique of etching thin section. Experimental data show that the now percolation velocity is lower than that of the first time at the same displacement pressure by pumping again, which shows that the flow percolation in model needs certain starting pressure. At the same time, the flow percolation room, the driving force of flow percolation system and the water saturation are analyzed. The results show that the decrease of flow percolation room makes the absolute permeability reduce and the decrease of driving force makes the effective permeability reduce.