In January 1999, Petroleum Development Oman installed an Expandable Sand Screen in the Rahab field. The expandable sand screen was installed across a newly perforated production interval in an existing well. The low production potential precluded the economical installation of an Internal Gravel Pack across the new interval for mandatory sand exclusion. On the other hand, the limited production exposure provided an opportunity to trial a novel, potentially more economical, alternative to gravel packing. The opportunity was therefore taken to trial an expandable sand screen. This trial is the first application of an expandable sand screen in a producing well. The installation of the expandable sand screen proceeded smoothly. The sand exclusion performance to date has been exemplary. Production tests show an increase in gross and net production rate in line with expectations.