Non-Newtonian flow characteristic of heavy oil is the main reason resulting in low oil recovery rate and low recovery factor in heavy oil reservoir.ZHSS-01 surfactant system can form reverse emulsion when it is mixed with heavy oil in the reservoir in a relatively wide range of temperature(30-71℃)

relatively high salinity(16×10

4

mg/ L)and relatively high hardness of water (1.1×10

4

mg/L)

which would lead to a viscosity breaking effectiveness of over 98%.As a result

the rheological characteristics of percolation flow of heavy oil around the wellbore can be improved

fihrational resistance of heavy oil in the vicinity of the wellbore is lowered

and oil production rate is increased.Experimental study shows that recovery factor can be enhanced over 3 % when heavy oil being displaced with ZHSS-01 surfactant system.