Influence Of Heavy Oil Temperature On Sand Removal Performance Of Desander

Heavy oil is an important resource in China and its physical properties are greatly affected by temperature.However,the change of physical properties of heavy oil will seriously affect the desander's desander effect,increase unnecessary energy loss,and even lead to the entire de-sand system and pipeline can not operate properly.In this paper,the influence of the temperature of heavy oil on the descaling performance of the descaling device is studied by the method of theoretical analysis and numerical simulation.The main research contents are as follows:(1)Study on the properties,classification and components of heavy oil.Understand the characteristics of heavy oil at different temperatures and the corresponding dynamic viscosity.(2)Based on the principle of liquid-solid separation,the geometric model of cyclone desander is established.Adopt RNG k-? model,QUICK discrete format of convection term,PRESTO of pressure gradient term! Pressure interpolation format and pressure velocity coupling SIMPLEC algorithm were used to numerically simulate the liquid phase flow field of the cyclone descaler,and the velocity,pressure and turbulence distribution of the liquid phase flow field were analyzed and studied(3)Based on the simulation of liquid-solid two-phase(heavy oil desanding)and liquid-solid three-phase(water cut heavy oil desanding),DPM model is used to change the three main parameters of heavy oil temperature,particle diameter and oil-water mixing ratio.Through 174 sets of liquid-solid two-phase simulation and 162 sets of liquid-solid three-phase simulation,the relationship between sand removal efficiency and heavy oil temperature,particle diameter and oil-water mixture ratio is clarified.(4)Based on the analysis of the simulation results,the optimal temperature for the three-phase separation of oil,water and sand with the oil-water mixing ratio of 0.2 was determined at 34?(dynamic viscosity of 1.860 Pa·s)in the actual working condition,considering the factors of improving separation efficiency and reducing energy loss.38?(dynamic viscosity of 1.414 Pa·s)is the optimum temperature for three phase separation of oil,water and sand with an oil-water mixing ratio of 0.3.43?(dynamic viscosity 0.564 Pa·s)is the optimum temperature for three phase separation of oil,water and sand with an oil-water mixing ratio of 0.4.Through the above research,this paper can control the temperature of heavy oil to make the desander achieve the optimal separation efficiency in future work,which is of practical significance to the field work.