Uniform injection profile is a reservoir management goal for better sweep efficiency and uniform flood front displacement. Natural and thermal induced fractures in tight reservoirs are difficult to avoid, especially when drilling horizontal wells. Evolving well completion technology has introduced several completion types to delay premature breakthrough by isolating fractures in horizontal wells. In the targeted area where tight rocks and natural fractures exist, several of these completion technologies have been tested on horizontal oil and water wells.
This paper will detail a recent successful trial of a special downhole completion design that provides improved capability for controlling fluid distribution in highly fractured horizontal wells. Also, it will provide information on the reservoir performance after full implementation of this design. The completion design integrates two field proven technologies, inflow control device (ICD) and inflow control valve (ICV) technologies, for maximum reservoir management and control. This unique design was specially tailored to suit a well case in the largest onshore oil field in Saudi Arabia. The primary objective of this completion is to achieve formation compartmentalization and fracture control and isolation in very heterogeneous formations. The completion is also designed to provide intervention capability for future coiled tubing (CT) operations to stimulate or isolate any well section. This functionality will ensure maximum completion performance to achieve even fluid distribution into the induced thermal and natural fractures, thereby optimizing injection profile along the well path, especially for seawater flooding wells.