Patent ID: 7984765

Claim:
A system for well intervention in subsea installed water- or hydrocarbon producing wells, comprising a surface vessel with equipment for handling and control of a connection string for downhole tools; a system for the supply and return of drilling fluid, from which the connection string runs down into a drilling hole on the subsea through open sea without a riser or landing string being fitted a X-mas tree, being arranged on the well; a blowout preventer wherein the blowout preventer is associated with the X-mas tree, the blowout preventer, being arranged on the well; a drilling fluid return system in combination with complementary valves to control well pressure and well fluid, said drilling fluid return system being placed on top of the blowout preventer through which the connection string is led; a return line for drilling fluid wherein the return line runs from the drilling fluid return system to the system for supply and return of drilling fluid; and a collectable intervention valve, wherein the intervention valve is anchored in the drilling hole and wherein the intervention valve is arranged to function as a testable, temporary barrier, wherein the valve comprises elastomer seals and means for closing the bottom and top of the intervention valve, in order to shut off the well and to be opened to drive through downhole tools in the well, and wherein the intervention valve is wireless remotely operated.