1、 Technical mechanism: By reducing the interfacial tension of oil and water, changing the wettability, the contact angle becomes larger, the adhesion work is reduced, the oil is easily pulled away from the rock, and the oil recovery is enhanced; It is the activator that can reduce the capillary resistance of oil-bearing reservoir and make the active water enter the original capillary, so as to improve the sweep efficiency and oil recovery; It is the oil drop washed from the rock that is emulsified into O / W emulsion by the active agent. The emulsion produces the superimposed liquid resistance effect through the capillary, increases the resistance of the high-permeability section, injects water into the low-permeability section, and improves the sweep efficiency.   2、 Technical features: The surfactant flooding technology with biosurfactant as the main body. High efficiency, environmental protection, continuous stability, effective reduction of water injection pressure. Low cost, good effect, in line with the "cost reduction and efficiency". It has good solubility, can be prepared by using the existing equipment in the oil field, and has simple on-site construction.   3、 Technology application: