Production risers having rigid inserts and systems and methods for using

    公开(公告)号:US09850719B1

    公开(公告)日:2017-12-26

    申请号:US15495012

    申请日:2017-04-24

    CPC classification number: E21B17/01 E21B17/1007 E21B17/12 E21B19/004

    Abstract: An apparatus enables modifying a riser's operating parameters for transporting production fluids from a subsea well to an offshore production facility after an initial period of production to address changes over time in the conditions of the reservoir and/or the riser without removing the original riser. An insert riser having a smaller diameter is inserted into the riser after the initial period. The original riser has a recessed seal face for receiving seal element(s) and a recessed lock groove for receiving a locking ring. An intervention coiled tubing having a sleeve removal tool is inserted into the riser to engage a protective sleeve covering the recessed seal face. The tubing is pulled to the floating structure thereby removing the protective sleeve and the temporary retaining ring from the production riser, exposing the recessed seal face. The insert riser can then be inserted into the riser and locked into place.

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