| 摘要 |
A method and a device for extending at least the lifetime of a Christmas tree (10) or an umbilical (22), the Christmas tree (10) being provided with a high-pressure hydraulic valve package (12) and a low-pressure hydraulic valve package (14) and the umbilical (22) including electrical power and control cables (24) and hydraulic pipes (26, 28), and the method including - retrofitting an upgrading module (50) including at least a control unit (62), a hydraulic high-pressure pump (66), a second high-pressure hydraulic valve package (61 ), and a hydraulic reservoir (70) onto or at the Christmas tree (10), - supplying the high-pressure pump (66), directly or via the reservoir (70), with hydraulic fluid from a pipe (26, 28) in the umbilical (22), the high-pressure pump (66) being connected to the second high-pressure hydraulic valve package (61), - connecting the second high-pressure hydraulic valve package (61 ) to a downhole safety valve (32); - connecting the electrical power and control cables (24) of the umbilical (22) to the control unit (62), and - connecting control cables (64) between the control unit (62) and valves in the low-pressure hydraulic valve package (14). |
