Three novel concepts have been identified which realise the benefits of screenless completions. The most developed of the techniques, the slotted completion for sand management, is described along with the underlying mechanism by which it is able to defer or avoid sand production.

The investigation of this novel completion is based on a laboratory testing programme centred around polyaxial cubical samples of Castlegate sandstone, subjected to a 3-d stress regime. The design of these block tests was based, in part, on numerical analyses, using in-house modelling capabilities for simulating Castlegate sandstone. The analysis assisted in defining the borehole and slot dimensions. The pretesting numerical analyses are presented, along with the laboratory block test results. Both the analysis and test results provide ‘proof of concept’ for the mechanisms underlying this novel completion technique.

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