Method and Device for Extending Lifetime of a Wellhead

摘要

A method and a device are for extending the lifetime of a Christmas tree. The Christmas tree is provided with at least a first high-pressure hydraulic valve pack, a first low-pressure hydraulic valve pack or a first chemical valve pack, and the Christmas tree is arranged to be connectable to an umbilical, which comprises at least electrical power or control cables, hydraulic tubes or chemical tubes. The method comprises:
retrofitting an upgrading module to or by the Christmas tree and connecting the upgrading module to the Christmas tree with the necessary number of tube and wire connections, the upgrading module comprising a second control module, and at least a hydraulic high-pressure pump with a second high-pressure valve pack and a hydraulic reservoir, a hydraulic low-pressure pump with a second low-pressure hydraulic valve pack and a hydraulic reservoir or a chemical pump with a chemical reservoir;supplying the second control module with electrical power and control signals via the umbilical or from vessel; andsupplying at least the high-pressure pump, the low-pressure pump or the chemical pump, directly or indirectly via their respective reservoirs, with hydraulic fluid via the umbilical or from a vessel.

主权项

1. A method of extending the lifetime of a Christmas tree, the Christmas tree being provided with at least a first high-pressure hydraulic valve pack, a first low-pressure hydraulic valve pack or a first chemical valve pack, and the Christmas tree being arranged to be connectable to an umbilical which comprises at least electrical power or control cables, hydraulic tubes or chemical tubes, the method comprising:
retrofitting an upgrading module in association with the Christmas tree and connecting the upgrading module to the Christmas tree with the necessary number of tube and wire connections, the upgrading module comprising a second control module, and at least a hydraulic high-pressure pump with a second high-pressure valve pack and a hydraulic reservoir, a hydraulic low-pressure pump with a second low-pressure hydraulic valve pack and a hydraulic reservoir or a chemical pump with a chemical reservoir; supplying the second control module with electrical power and control signals via the umbilical or from a vessel; and supplying at least the high-pressure pump, the low-pressure pump or the chemical pump directly or indirectly via their respective reservoirs with hydraulic fluid via the umbilical or from a vessel, wherein the upgrading module is placed beside the Christmas tree.