Abstract: Using the test loop, phase inversion emusifying test is made on the W/O emulsion with 65% water cut of heavy oil from Xintan of ShengliOilfeild to research the property of W/O emulsion formed. Results show that under the same conditions, test loop preparation emulsiondroplet has a wide distribution range with less stability, the test loop flowrate and the emulsifier concentration has a remarkable impact on the dynamic stability of the emulsion when other conditions remained unchanged, the greater the flowrate is, the better the O/W emulsion of dynamic stability is. In a certain range, the greater the concentration of emulsifier is, the better the O/W emulsion stability is. In the pipe flow conditions, O/W emulsion formation and emulsion adsorption in pipe wall can reduce the pipe friction. Emulsion stability is the main factor affecting pipe pressure drop. Temperature has little effect on the apparent viscosity of the O/W emulsion. At the same time, the O/W emulsion with 0.8 mg/g additive can be transported smoothly after shutting down.