Expandable Sand Screen (ESS®) was deployed successfully as a sand control device in two horizontal openhole completions in two geologically different offshore fields in Brunei. A critical success factor was the choice of a drill-in-fluid (DIF) that maintained hole stability and gave a near-gauge hole during running and expansion of the ESS. Field experience and extensive research led to the choice of a synthetic-based DIF for one well but a water-based DIF for the other well. Challenges unique to the deployment of ESS in these wells are discussed.

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