Method and Device for Extending at Least the Lifetime of a Christmas Tree or an Umbilical

Abstract

A method and a device are for extending at least the lifetime of a Christmas tree or an umbilical. The Christmas tree is provided with a high-pressure hydraulic valve package and a low-pressure hydraulic valve package and the umbilical includes electrical power and control cables and hydraulic pipes. The method includes retrofitting an upgrading module including at least a control unit, a hydraulic high-pressure pump, a second high-pressure hydraulic valve package, and a hydraulic reservoir onto or at the Christmas tree; supplying the high-pressure pump, directly or via the reservoir, with hydraulic fluid from a pipe in the umbilical, the high-pressure pump being connected to the second high-pressure hydraulic valve package; connecting the second high-pressure hydraulic valve package to a downhole safety valve; connecting the electrical power and control cables of the umbilical to the control unit; and connecting control cables between the control unit, and valves in the low-pressure hydraulic valve package.

Dependencies are inferred from the claim text.