Patent ID: 9033053
Filing Date: 2015-05-19
Classification: E21B

Abstract:
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 a 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.