A mature field in northwest China produces light oil from a multilayered sandstone reservoir with a strong water drive. Crossflow between layers was resulting in uneven sweep and variable inflow profiles with high and unstable water cut, which had reached 75% in one well. The well was becoming uneconomical, and the operator needed a solution.
ResFlow AICD 2M is a piloted floating disc autonomous inflow control device (AICD) that enables balancing inflow from reservoirs and preferentially restricts unwanted water and gas. The devices are fitted in basepipe and distributed across the sandface. The floating disc is controlled by the flow in a pilot line and shuts off the production flow path when water or gas is detected, leading to more stable production profiles and improved recovery efficiency.
Six AICDs were installed on 2 7/8-in screen joints across two reservoir segments separated by cup packers in the cased hole well. Water production reduced by 50% and oil production increased by 200% after recompletion with the AICDs.
