fax 01-972-952-9435. AbstractIn order to comply with local regulation, production volumes from each reservoir in the Okowri field offshore Nigeria, must be identifiable. Addax Petroleum's strategy for their Okwori subsea field development project was to produce a number of stacked reservoirs in each of the wells, using selective completions to facilitate testing and fingerprinting of individual zones.Due to the unconsolidated nature of the reservoir, downhole sand control was required for all wells. A technical study of all available technology at the time of design showed that expandable sand screen deployed inside the casedhole could deliver the combination of reservoir zonal isolation and internal diameter for integration with selective downhole control flow valves and isolation packer. This combination of expandable and intelligent completion technologies was an industry first.The initial completion design was based on casing and cementing the entire productive interval prior to perforating each of the target reservoir sands. Expandable sand screens [ESS®] were then placed across each interval spaced out with blank pipe. Isolation packers were set within the string to provide zonal isolation. Following installation of the sandface completion, downhole flow control valves were run through the expanded sand screens and the producing interval isolated, with packers set in the blank pipe run between the sections of expandable sand screen. This completion configuration delivered zonal isolation and surface control over each zone, facilitating selective production and fingerprinting.This paper describes the initial casedhole completion design, systems installation and subsequent performance as well as the engineering and project management that are required in order to deliver this combination new technology system. Further, the paper will also discuss how the original completion design has evolved with the introduction of the latest openhole zonal isolation devices to deliver a true openhole sandface completion with intelligent selectivity.