Patent ID: 11920427
Assignee: nan
Field: Civil engineering (Other fields)
Classification: CPC E | IPC E

Claim 0:
1. A method of operating a subsea production system, the system comprising an electric subsea tree connected to a subsea well, a production tubing in the well, and an electrically operable electric downhole safety valve, the electric subsea tree comprising a through-going bore forming part of a fluid line in the subsea production system extending down to a position at or close to the electric downhole safety valve, wherein the method comprises, in case of malfunction in operation of the electric downhole safety valve, the steps of:
installing a hydraulically operable insert hydraulic downhole safety valve into the well for positioning within the production tubing;
connecting the insert hydraulic downhole safety valve to the fluid line at a point of setting in the subsea well for operation of the insert hydraulic downhole safety valve;
operating the insert hydraulic downhole safety valve from a position outside the subsea tree using the fluid line, wherein the fluid line extends from an input port located at a position outside of the electric subsea tree to the point of setting in the subsea well via the through-going bore.