Patent ID: 8534364

Claim:
An underwater placed assembly for production of gas, or gas and condensate/oil, from subsea, gaseous reservoir, wherein at least one production well is provided from the seabed to a production zone and at least one water injection well is provided from the seabed to an injection zone, wherein the assembly comprises: a pressure increasing device connected to the outlet from the production well in order to increase the pressure in a production flow from the production well, and a water turbine connected to and driving the pressure increasing device, said water turbine has an inlet for water, which is directly drawn from a location in the sea adjacent to the water turbine and said water has a high hydrostatic pressure caused by the pressure of the water column between the sea surface and the well level, and an outlet connected to the inlet of the water injection well, the water turbine driven by and withdrawing at least a part of the hydrostatic energy from the water thus delivered with a lower pressure to the water injection well, so that water thus delivered to the water injection well has a lower pressure than the hydrostatic pressure at the inlet of the water turbine.