Quantitative Description Of Microscopic Seepage Mechanism In Water Drive Reservoir

The micro displacement simulation experiment is an important method of multiphase fluid flow mechanism and law research,through the experiment can be directly observed in a variety of micro seepage phenomenon,and regularity by experimental phenomena and micro seepage mechanism combined with the way to find the phenomenon.This article summarizes the domestic and foreign related microscopic model,micro seepage mechanism of oil displacement and research status of micro seepage simulation experiments,comparative analysis of the similarities of clastic rock and carbonate rock core and the similarities and differences,and thus make the research on the corresponding technical route,and on the micro model and the experimental process in this paper briefly.Based on the experimental study on water flooding microscopic seepage sandstone and conglomerate model,this paper discusses four typical types of micro pore water seepage mechanism of reef limestone flooding,and therefore make the dense reef limestone matrix model,crack model,pore type reef limestone cave reef limestone model,vug fracture type reef limestone model to study water flooding microscopic seepage.In each experiment,the electron microscope image acquisition technology was used to capture and record the dynamic image data during the whole experiment.This paper lists the experimental procedure in each experimental group,and then focus on the analysis of images representative of micro seepage phenomenon,and detailed qualitative and quantitative description of the phenomenon as far as possible.Finally,the micro water flooding seepage law of each model is compared and analyzed.The experimental results show that:?the water flooding process of sandstone model and conglomerate model is simpler than that of reef limestone model;?The matrix has a great influence on the flow of fluid in the reef limestone;?The remaining oil in sandstone model and conglomerate model is mainly distributed in the form of oil film and speckles,while the remaining oil in the reef limestone model is mainly distributed in the form of infection and the oil film attached to the surface of the slot.This paper has some reference significance to the development of the reef limestone reservoir.