Structural Design And Numerical Simulation Of Underground Water Control Device

The oil production technology with horizontal well is an efficient way of oil exploitation.Horizontal well can increase the contact area between wellbore and oil and gas reservoir,improve the production of oil and gas,and reduce the production time.In rock layers with natural fractures,horizontal wells can be spliced ??with natural fractures.Since the permeability of natural fractures is much greater than the permeability of rock layers,horizontal wells can improve production efficiency.However,due to the presence of bottom water ridges and bottom water cones,horizontal wells will reduce the efficiency of oil and gas production during the production process.In order to achieve the purpose of underground water blocking,this paper designed two new types of automatic inflow control devices(AICD).One AICD designed in this paper is a dual-entry device,and another AICD is a sand control type AICD device.The fluid flows in these two AICDs are simulated numerically to investigate fluid flow behavior.The ability of the AICD device for blocking fluid flow can be determined by the pressure difference between the inlet and outlet of the AICD.The greater the pressure difference,the better the effect of the AICD device in preventing fluid flow.The performance of the AICD can be determined by calculating the fluid flow at different rate to obtain the pressuredifference between its inlet and outlet.Two types of AICD with different geometric shapes are designed,and the pressure difference between the inlet and outlet is calculated.The ratio of pressure difference for water and natural gas is obtained.The AICD with radial branch flow channel and the AICD with tangential branch flow channel are designed in this paper.Numerical results show that they have nice feature for blocking water flow.An AICD is designed with the function of preventing sand entrance,it can block the sand particles from entering the device.The radical branch flow and tangential branch flow in the AICD are simulated numerically.The numerical results show that the two AICD devices designed in this paper have the advantages of simple structure and strong blocking water effect.This paper proposes ideas to further improve the AICD flow path,by changing the cross-sectional area of ??the outlet and inlet,the rotation angle of the AICD internal flow path,etc.,to achieve the optimized AICD.