西南石油大学学报（自然科学版）2025，Vol.47Issue(3)：112-123,12.DOI:10.11885/j.issn.1674-5086.2022.09.30.02
水气分散体系驱油微观机理研究
Micro Mechanism of Oil Displacement by Water Gas Dispersion System
摘要
Abstract
Low permeability reservoirs have small pores,fine throats and large seepage resistance,and the recovery percent of conventional water drive is only about 20％.Gas injection development is not only limited by gas sources,but also seriously affected by gas channeling and other problems;therefore,it is urgent to develop key technologies to continuously improve oil recovery in low permeability reservoirs.The oil displacement technology of water gas dispersion system is a new technology to improve oil recovery.This technology can realize the control of seepage resistance and supplement energy at the same time,thus greatly improving the water displacement efficiency of low permeability reservoirs.In order to understand the micro oil displacement mechanism of water gas dispersion system,the flow characteristics and distribution laws of fluid in the displacement process were recorded,identified and quantitatively calculated through water drive,gas drive and water gas dispersion system oil displacement experiments by means of micro etching model,high-speed camera acquisition and ImagePro-Plus6.0 software identification.The experimental study shows that the main producing area of water drive is the main channel,and the remaining oil is mainly distributed in the edges and corners of the model;the characteristics of CO2 gas channeling are obvious,the gas mainly flowing in the pore center and forming a water/oil film on the pore wall;the most remarkable feature of water gas dispersion system for oil displacement is that it mixes with the oil phase"highly"after entering the pores.The mixed microbubbles can not only produce"plugging"effect,increasing the seepage resistance of the main channel,but also promote the subsequent fluid to change direction and enter the small pores that are not swept by water drive or gas drive,with obvious effect of expanding the swept volume.And it can significantly displace the remaining oil at the edges and corners,and even recover all the residual oil in the blind end.The oil recovery efficiency of water drive,gas drive and water gas dispersion system drive is 71.6％,82.0％and 91.0％,and water gas dispersion system plays a prominent role in improving oil displacement efficiency.关键词
微观机理/水气分散体系/渗流阻力/波及体积/驱油效率Key words
micro mechanism/water gas dispersion system/seepage resistance/swept volume/oil displacement efficiency分类
能源科技引用本文复制引用
尚祯浩,伍家忠,熊伟,张墨习,陈兴隆..水气分散体系驱油微观机理研究[J].西南石油大学学报（自然科学版）,2025,47(3):112-123,12.基金项目
国家重大科技专项(2021DJ1302) （2021DJ1302）
