Water control performance analysis and structural parameter optimization of autonomous inflow control device with floating disc

Key words:  floating disc  autonomous inflow control device  relationship between pressure and flow  water control  structural optimization

Abstract:

To study the water control characteristics of the autonomous inflow control device (AICD) with a floating disc, and to design the structural parameters that meet the requirements of water control at a certain flow rate, a mechanical model on the steady characteristics of the floating disc AICD was proposed. The flow-pressure relationship of the floating disc AICD under different flow rates, densities, viscosities and structural parameters was analyzed. The results show that under the conventional fluid production rate of oil wells, the pressure difference of the fluid flowing through the floating disc AICD decreases with the increase of viscosity and with the decrease of density. The inlet channel radius, as a key parameter for the water control performance of the floating disc AICD, has a threshold value of 2.25 mm. When the value of the inlet channel radius is less than this value, the effect of water control is better. The outer radius of the valve disc has the best value matching the inlet channel radius. By taking this value, the pressure difference of the water flowing through the floating disc AICD is the largest, and the water control effect is the best.