ABSTRACT:

Sand, when associated to produced fluids, erodes hardware, blocks tubular, creates bottom hole accumulations and downhole cavities behind casing compromising layers isolation. Finally, sand has to be separated at surface for disposal. Sand can be maintained in place using different approaches and solutions. A reliable assessment of the flow efficiency achievable by each type of well completion is a crucial piece of information when deciding on the strategy for field management in unconsolidated or even weakly consolidated formations. This paper describes about 20 years experience grown in ENI/Agip while dealing with sand problems in Adriatic Sea basin, offshore Italy. Designing criteria for effective sand control are reported too. Operative risks associated to various sand control methods are presented and relevant achievable well performances compared. Innovative sand control completion techniques actually under study and/or under field evaluation are also presented.

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