The Structural Design Optimization And Numerical Simulation Of A New Type Of AICD Device

Horizontal well is a kind of high efficient mining method with less well yield,has been widely used in the development of bottom water reservoir,fractured reservoir,heavy oil reservoir,but in different types of reservoirs(especially the production process of oil reservoir)reservoir bottom water coning is too fast,causing water cut rate rising rapidly,serious influence the comprehensive benefits of horizontal well exploitation.Therefore,to solve this problem,this paper developed a new type AICD.To simulate the fluid flow process in the inside of the device by using the numerical simulation method,illustrates the principle of water control,and flow field,fluid sensitivity,ability to control water were analyzed,and compared with the proposed FD AICD,the simulation results show that AICD model has good oil and water control effect;the performance is basically not influenced by the density of the fluid viscosity and flow effect;the scope is wide;the water control performance is better than the runner type(FD)AICD.Through numerical simulation,the influence of different structure parameters including the number of branch angle,branch angle,and the number of arc baffles on the water control performance of the device.With the increase of the branch angle,the more obvious the rotation of water in the disk flow area,the pressure drop produced by the water will increase,and the greater the resistance will be.With the increase of the number of Y-shaped branches,the inlet velocity decreases,and the more restrictive effect of the new AICD device on the production of oil and water.With the increase of the number of arc baffles,the pressure drop of the oil phase in the AICD device basically does not change,and the pressure drop of the water phase decreases obviously,which is because the velocity of the water phase in the disc type flow area decreases obviously.Through the analysis of the extreme difference of the orthogonal test results,it is found that the angle of the branch angle has the greatest influence on the oil and water separation efficiency,which is the main influence factor.The number of branches and the number of arc baffles have little influence on the efficiency of oil and water separation,and it is a secondary factor.The efficiency of oil and water separation is the highest under the optimized structure of the number of Y type branches,the degree of branch angle of 60 degrees and the number of the arc baffles.The oil and water separation efficiency is the highest of 92.30%.Numerical simulation analysis of the optimized structure shows that the pressure drop of the water phase is about 2.5 times that of the oil phase pressure drop,and the water phase velocity is about 2 times that of the oil phase,which indicates that the optimized structure can have good effect of increasing oil and water control.With the increase of water content,the overflow pressure drop of the fluid increases with the increase of the water content.The overflow pressure drop of the fluid increases with the increase of the flow rate.It shows that the optimized structure has good water control effect for high water content and different flow conditions.