Water in oil emulsion was prepared under different water volume fraction,stirring speed and temperature.By simulating the different situations encountered in the process of mixed transportation,the particle size distribution of the emulsion droplets and its relationship with viscosity were analyzed.The results show that when the volume fraction of water is less than 60% in the emulsion,the average particle size of the dispersed phase of the emulsion becomes smaller as the stirring speed is increased,and the viscosity becomes larger.With the increase of temperature,the average particle size of the dispersed phase of the emulsion is larger and the viscosity gradually decreases.As the volume fraction of water increases,the average particle size of the dispersed phase droplets becomes larger,and the viscosity shows a clear upward trend.However,when the water volume fraction is greater than 60%,the viscosity of the emulsion decreases drastically as the volume fraction of water increases,and the flow pattern of emulsion changes.The research results have certain guiding significance for the safe operation of pipelines and the study of gathering and transportation technology.

Wax in waxy crude oil is one of the main reasons for the poor fluidity of crude oil. In order to solve the great difficulties brought by the fluidity of waxy crude oil to crude oil mining and gathering, it is necessary to carry out wax removal treatment on crude oil.Microbial paraffin removal technology is the use of microbial metabolism to directly degrade wax components in crude oil and degrade long chain hydrocarbons into medium and short chains, thus reducing the wax content in crude oil at all. By detecting the wax content in crude oil and wax crystal morphology before and after the treatment of compound bacteria, the effects of the compound bacteria on the degradation of wax components in crude oil and the morphology and size of wax crystals in crude oil are studied, it is concluded that the wax removal characteristics of the compound bacteria are analyzed macroscopically. Finally, the paraffin removal effect of the compound bacteria is verified from the microscopic point by detecting the particle size distribution of the oil sample after paraffin removal treatment.