底水油藏高含水期剩余油挖潜可视化驱油实验

C油田馆陶组油藏为强底水油藏，储层物性具有高孔、高渗特征，经过长期天然能量开采，整体进入高含水开发阶段，亟待探索新的补充能量方式，提高剩余油动用程度。研究为了实现油藏开发过程模拟的可视化，结合油藏实际情况，设计了满足几何相似条件的物理胶结模型和两组不同介质(活性水，气体和泡沫交替)驱替实验，利用X射线安检机直观了解岩层中流体渗流情况、底水锥进现象以及剩余油分布特征。研究表明：大尺寸平板模型实验能够直观地描述底水油藏水锥形态；2组实验在初始底水驱阶段水驱规律相同，水驱采收率达到42%，波及范围有限，井间和顶部剩余油富集；活性水驱阶段提高采收率0.73%，剩余油动用程度不高，顶部剩余油富集；气体和泡沫交替驱可有效动用井间和顶部剩余油，较水驱提高采收率2.14%。

The Visual Oil Displacement Experiment of Residual Oil at High Water-Cut Stage in Bottom-Water Reservoir

The Guantao Formation is the main oil-bearing horizon of the C oil field with good physical properties, high porosity and high permeability. After long-term production with natural energy, it has entered a development stage with high water cut. So it is urgent to explore new ways to supplement energy and increase the utilization degree of residual oil. In order to visualize the simulation of the reservoir development process and combined with the actual situation of the reservoir, a physical cementation model that met geometric similar conditions and two sets of displacement experiments with different media (active water, foam alternating gas) were designed. The X-Ray machine was used to intuitively understand the fluid flow, coning phenomenon of the bottom water, and the distribution characteristics of residual oil in the rock formations. The research showed that: the experiments with large-scale slab models can intuitively describe the coning state of water in the bottom-water reservoirs; two sets of experiments had the same water flooding laws during the initial bottom-water flooding stage, with the recovery degree of 42%; the range of displacement of bottom water was limited with the enrichment of residual oil among the wells and at the top; the oil recovery in the active-water flooding stage was enhanced by 0.73% with the low utilization degree of residual oil, and the enrichment of the residual oil at the top; the recovery in the foam alternating gas flooding stage was enhanced by 2.14%, and the residual oil among the wells and at the top was effectively displaced.