The AICV flow performance curve for single phase medium oil, water and gas is shown in Figure 1. The figure shows that unwanted production of gas and water is efficiently choked. The oil ICD strength can be varied, depending on the reservoir and well performance.
The choking sequences for the AICV can be optimized by a number of valves in each zone. Each zone is isolated with packers in the annulus along the horizontal section. The choking sequence for water is shown in Figure 2, and represents a zone with five AICVs. When pure oil is produced from the zone, all AICVs are open. When water breaks through, the local water cut will increase, and the AICV will start to choke. The AICVs close the zone fully only when there is almost no oil (less than 2%). The AICVs will autonomously open when the zone is refilled with oil.
The choking sequences for gas are shown in Figure 3, and represent a zone with five AICVs. The closure sequence shows that with pure oil all AICVs are open. When the free gas increases, the local GVF increases and the AICVs start to choke. They close fully only when there is almost no oil (less than 2%). The AICVs will autonomously open when oil is refilled in the zone.