In the operating process of well, as the joining of working liquid, the formation will be easy to change into strong oil wettability in the near of wellbore zone, so as to reduce oil phase permeability, increase water phase permeability and water saturation. Test certificates that, if water saturation increased  from *0% to *5%, the relative permeability of oil will decrease from *0% to *0%. Join a kind of strong hydrophilic low interfacial tension of surfactant into formation, can make the formation by oil wetting into water wetting, so as to improve oil phase permeability; Low interfacial tension can make the viscosity crude oil flow, reduce the water phase permeability, flow space occupied volume (namely saturation), remove water lock effect of formation, increase  the crude oil production.

   Technical Index:

   (3)Suitable temperature:≤**0℃;

   (4)Surface tension:≤*8mN/m;

   (5)Interfacial tension:≤0.6mN/m;

   (6)Wetting angle(contact):≤*5.

   Choose well principle:

   EL**3 wet reversal agent is mainly used for low permeability oil and gas well operation.

  Use Method: