Fmc Technologies, Inc.

David Ramsay Hutchison

Richard D Kent

Graeme John Collie

A completion system comprises a christmas tree () mounted on a wellhead housing (), a tubing hanger () landed in the tree or wellhead housing, the wellhead housing () being mounted on a casing string () and a tubing string () being suspended from the tubing hanger within the casing string; wherein, in use, the annulus defined between the tubing () and the casing () serves as a production bore. A second tubing string () is expanded into sealing engagement with the casing string () over at least a portion of their lengths. The annulus normally used to provide well service functions is thus eliminated. Well servicing is instead provided via the tubing string (), which may be coiled tubing.

Central circulation completion system

A horizontal Christmas tree is adapted for ESP/HSP or downhole sensor deployment by a coiled tubing hanger received in the tubing hanger . Coiled tubing suspends downhole equipment such as ESP , and carries power/signal lines. These lines are connected to an external line via a transition connector in a tubing access plug provided in an internal tree cap . A debris cap is provided with a further connector . Self orientating wet mate connectors are provided between the connectors and external line . The coiled tubing hanger and/or tubing hanger may be provided with flow by flutes or holes ( FIGS. and ) sealable by a separate adapter plug ( , FIG. ) above the coiled tubing hanger. Flow test procedures are also disclosed.

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Dunfermline, United Kingdom

David Ramsay Hutchison