| 摘要 |
A system and method is described for well intervention in subsea installed oil and gas wells, comprising a surface vessel ( 10 ), or rig, with equipment ( 22 ) for handling and controlling a connection string ( 20 ) for downhole tools, and also a system ( 26 ) for the supply and return of drilling fluid, from where the connection string ( 20 ) for the downhole tool runs down in an actual drilling hole ( 36 ) of a well on the subsea, where a X-mas tree ( 12 ) with associated blowout preventer ( 16 ) is arranged on the well, and where a return line ( 24 ) for drilling fluid runs up to said system ( 26 ) on the surface vessel or the rig. The connecting string ( 20 ) for downhole tools runs into the well through open sea without a riser or landing string being fitted, and a removable intervention valve ( 14 ) is arranged in the drilling hole ( 36 ), where the intervention valve is arranged to function as a testable, temporary barrier.
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