▎ 摘　　要

NOVELTY - Gas channeling prevention system includes 0.1-2 wt.% foaming agent, 0.05-1 wt.% polyelectrolyte, 0.001-0.1 wt.% foam enhancer, 0.01-0.5 wt.% oxidizing agent, 0.05-2 wt.% chelating agent, and the balance is water. USE - Gas channeling prevention system for gas flooding oil recovery process (claimed). ADVANTAGE - The gas channeling prevention system has good high temperature resistance, salt resistance, good injectability and selectivity, and seal deep channeling, to achieve the purpose of expanding the volume of gas flooding and improving oil recovery.