颗粒堵剂在多孔介质中运移性能研究

Research on Migration Performance of Particulated Plugging Agent in Porous Media

针对调剖用颗粒堵剂存在运移性能差、易堆积在近井地带的问题,通过室内物理模拟实验找出颗粒堵剂在多孔介质中能注入的渗透率界限。利用模型研究缓膨颗粒、粉煤灰等常见颗粒的注入性能、注入形态及封堵性能。结果表明,当砂管渗透率大于100μm^2时,缓膨颗粒(粒径5mm)能运移到砂管中部,并填充于砂管的大孔道之中。对30μm^2砂管,粉煤灰水驱后可运移至砂管中部。在渗透率大于60μm^2的砂管中,水驱后粉煤灰可以运移至整个砂管。实验结果对更好地制定施工工艺参数有指导意义。

In consideration of the poor performance and the easy accumulation at immediate vicinity of wellbore of the particulated plugging agent for profile control,the limit of permeability of particulated plugging agent when they are injected into porous media was identified via laboratory physical simulation experiment. The injection performance,injection form and plugging performance of the common particles like retarding swelling particles and coal ash,etc. were studied by making use of models. The results of study have shown that the retarding swelling particle with the particle size of 5 mm can migrate into the middle part of a sandpipe,filling the big porous channels of the sandpipe when the permeability of the sandpipe is larger than 100 μm^2. The coal ash flooded by water can migrate into the middle part of a 30 μm^2sandpipe. As for the sandpipe with the permeability larger than 60 μm^2,the coal ash flooded by water can migrate into all parts of the sandpipe. The experimental results have guiding significance for establishing construction process parameters better.