Lab physical simulation research on low gas liquid foam flooding

Considering the high cost of gas injection in conventional foam flooding,low gas liquid ratio foam oil flooding system composed with gemini surfactors 9BS-5-0,bataine and NaOH.Lab experiment measure the resistance factor,resistance coefficient to evaluate foam plugging ability.The resistance coefficient produced by foam is equal to the polyacrylamide with 0.15% mass faction.Effect evaluation of Low gas liquid ratio foam flooding under different gas liquid ration(0.05∶1~2∶1) indicate that recovery efficient increase is obviously better than pure surfactant system when mixed a few gas in the surfactant.When gas liquid ratio is 0.15~0.20,oil flooding system oil increase effect per unit is the best,when gas liquid ratio is 0.20,it shows: with the oil flooding system amount increasing,oil flooding agent per unit oil increment decrease,but recovery efficiency added value and comprehensive index increase.