Evaluation and Analysis of Field Tests for Polysurfactant

Polysurfactant,which bears dual characteristics of polymer and surfactant,is a newly developed agent for oil displacement.It shows high viscosity,resistances of salinity,oxidation and biodegradation,selective profile control and so on.Meanwhile,it has the abilities of flow control and emulsification.Through analyzing the effects of field tests,at different inject time,it is obtained that,in comparison with polymer flooding,polysurfactant flooding has better injectability,better profile control and longer low water-cut stage.There is no water-cut increasing stage for production wells and fluid production decreases significantly.Polysurfactant flooding after polymer flooding obstains a certain effect.Polysurfactant flooding after water flooding has obvious effect,and the recovery rate can been enhanced by 18%.