The energy consumption of oil gathering increases rapidly after the oil field enters the high water cut stage.If the normal temperature gathering and transportation is carried out,the cost can be saved,which can bring the enterprise benefit.In order to judge whether the pipeline can carry out normal temperature gathering and transportation,according to the field measured data,the thermo⁃hydraulic calculation model is constructed and modified, the thermo⁃hydraulic coupling calculation is carried out, the normal temperature gathering and transportation radius of the pipeline is determined,and the sensitivity of each influencing factor of the normal temperature gathering and transportation radius is sequenced by the single factor sensitivity analysis method.On this basis,the normal temperature gathering radius chart is developed to provide guidance for the surface normal temperature gathering work.The results show that the modified thermo⁃hydraulic model can predict the pressure drop and temperature drop of the pipeline,and the average relative errors between the calculated value and the measured value are 9.42% and 5.31%.The three most influential factors on the normal temperature gathering radius are the starting point temperature,the starting point pressure and the liquid production.The chart drawn by the above three factors provides the basis for the feasibility of normal temperature gathering and transportation in the pipeline,if not,the temperature and pressure required for the starting point of the pipeline can be determined by querying the chart.

People around the world have paid more and more attention to the problem of oil volatilization, because of the enforcement of laws on energy saving and lots of accidents caused by oil diffusion. It is important for people to find the laws of oil volatilization. That could reduce the oil diffusion during its transportation and storage, decrease the pollution, and prevent the occurrence of related accidents. Data of oil and gas diffusion in tank is obtained using the model of VOF that comes from CFD by considering the influence of wind speed, wind direction and tank type. It is also a good choice to use UDF as the source of the simulation analysis. The results show that wind speed has a great effect on oil evaporation. And the wind direction that perpendicular to the wall of the tank has evident effects. According to the study on evaporation loss of oil, the petrochemical plants must take some effective measures to reduce the oil diffusion, and reduce the risk of explosion. 