DISPLACING EXPERIMENTS OF TRUE MICROMODELS OF SANDSTONE AND FORMATIVE MECHANISMS OF MICROSCOPIC RESIDUAL OIL

摘要

Based on experiments of true micromodels of sandstone, the microscopic manner of water displacing oil and the formative mechanisms of residual oil were observed. The result shows that there are two types of displacement in the displacing process of oil were observed. The result shows that there are two types of Influenced by the pore structure and surficially physical features the unpistonlink displacement Dominates in the water wettability reservoirs. The residual oil was mainly formed by the means of by Passing, snap-off and wettability transition in pore surface.