Selective completions have been used in BSP's Iron Duke and Bugan fields to allow commingled production from multiple reservoir intervals, in some cases across fault blocks. Typically, the oil rims in Iron Duke and Bugan are overlain by large gas caps within heterogeneous sandstones. Recent PLT results have indicated that gas breakthrough occurs in high permeability sand streaks. As a result, selective production offers the potential to increase ultimate recovery by improved reservoir management. For example, specific simulation models built to investigate the benefits of a smart well have estimated 20% increase in UR in the Iron Duke. In addition, smart completions offer the potential of accelerated production.

The benefits of smart completions are discussed with particular reference to the well Iron Duke 19. This was completed with a 5 zone selective completion. Although the production performance of 3 of the 5 zones was worse that expected, the smart completion has demonstrated considerable value in allowing both production rates and expected ultimate recovery to be increased. This shows that much of the value of selective completions can be in providing flexibility to respond to reservoir surprises.

Some of the challenges that have been encountered with the operation of multi-zone selective completions and the solutions that have been put in place to optimise well and reservoir deliverability are also discussed. This experience builds on that described earlier for the much larger Oseberg field in Refs. 1 & 2.

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