Water Injection completion selection in a deepwater subsea environment requiring sand control is currently an inexact science with lack of a proven track record for life of field solutions. The West of Shetlands (WoS) fields Foinaven, Schiehallion and Loyal have been on injection since 1997 and are starting to develop a substantial track record of injection performance. This case study will provide a performance comparison of the 2 main completion types installed to date, namely Cased and Perforated (C&P) and standalone Wire Wrap Screens (WWS), along with a subset of a three zone Smart well completed with premium sand screens. The comparison focuses on 4 main areas;

  • Well Longevity

  • Completion Efficiency (skin)

  • Injection Conformance (Near Wellbore)

  • Performance of single and multi-zone injectors

The WWS screen performance is further subdivided by clean-up technique of which there are currently 5;

  • Backflow Oil Based Mud (OBM)

  • Bullhead Oil Based Mud

  • Bullhead Water Based Mud after spotting Breaker

  • Toe Fracture using External Casing Packer

  • Displace OBM to Solids Free OBM and bullhead

A variety of data will be presented as part of the comparison including, PLT Data, MDT Data, PFO Results, Hall Plots, UCS Data. A simple set of criteria is presented to select when C&P or sand screens are viable completion solutions.

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