Experimental study of distribution and quantitative characterization of discontinuous oil phase based on micro-CT

When a sandstone reservoir enters the ultra-high water cut stage, oil phase changes from continuous to discontinuous, which results in difficulties further development and utilization of reservoir. It is important clarify flow law distribution state discontinuous phases guide remaining production. This study selected samples reservoirs, accurately obtained information digital core, constructed matrix based on three-dimensional CT scanning distribution. We used cores construct pore network models calculate radius, throat pore-throat ratio, coordination number, tortuosity influence structure law. A micro-displacement experiment consisting two simulated was designed. To improve accuracy experiment, related pressure controlled form bound formation stage. In phase, situ at different displacement stages performed obtain distributions same location. The number droplets, 3D shape factor, Euler saturation coefficient were calculated, micro-remaining clumps quantitatively analyzed. According morphology characteristics, divided into types throat, film, droplet, island, corner. showed that sample with small large more likely dominant channels; moreover, concentrated this state. droplets largest had an obvious effect. island because good connectivity it difficult single pore. increased slowly, channels. corner film displace; thus, their numbers steadily. quantitative characterization helpful for scale.