Study On Pipeline Flow Characteristics And Energy Consumption Analysis Of High Pour Point Crude Oilafter Adding Depressant

With the development of my country's oilfields gradually entering the middle and late stages,the wax content in crude oil is getting higher and higher,and the freezing point and viscosity of crude oil are also generally rising.Most of the crude oil in our country is transported by pipeline,and generally needs to be heated and transported outside.As the freezing point of crude oil gets higher and higher,the required exit temperature and exit pressure become higher and higher,resulting in higher heating and power costs.The pour point depressant can effectively reduce the pour point and viscosity of the high pour point crude oil,thereby reducing the heat and power consumption of the oil pipeline,and effectively reducing the energy cost of the pipeline transmission system.Based on the energy consumption characteristics of the high pour point crude oil pipeline transportation system,this paper establishes a pipeline transportation energy consumption optimization model,analyzes the changes in the physical properties of the crude oil after adding additives,and screens five pour point depressants through indoor tests.The results prove that SL-2# drops Flocculant has the best effect on reducing pour point and viscosity of high pour point crude oil.In addition,the optimal additive parameters of SL-2# pour point depressant were tested and analyzed.The results showed that when the additive concentration is between 100 ppm and 150 ppm,and the additive temperature is above 55?,SL-2# pour point depressant can perform The greatest effect of reducing pour point and viscosity.Aiming at the heat transfer and flow characteristics of the high pour point crude oil dosing pipeline,PIPESIM software is used to analyze the sensitive factors affecting the temperature drop and pressure drop of the pipeline,and the effect of changes in the outbound temperature,ambient temperature,dosing concentration and delivery volume is given.The degree of influence of pipeline temperature drop and pressure drop.Combined with the energy consumption optimization model,the operating cost of different additive concentrations in low temperature environments is analyzed under the premise of comprehensive consideration of various constraints.The analysis results show that the operating cost of the pipeline transmission system is greatly reduced after the additive concentration.When it is 100 ppm,the operating cost is the lowest compared with the previous cost without dosing,which is reduced by more than 25%.The calculation and analysis of the energy consumption cost of the pipeline transmission system after the addition of the agent were carried out,and the energy consumption calculation software of the high pour point crude oil transportation pipeline was developed based on the Python language and field experiments were carried out for verification.The results show that the additive optimization operation program provided in this paper can greatly reduce the operating cost of the high pour point crude oil pipeline transportation system,and the effect of energy saving and consumption reduction is significant.