Powering subsea manifolds with subsea ocean and tidal turbines

Norrønt AS hereby presents a Forprosjekt to a Demo 2000 project to equip a sub sea manifold with a vertical axis style turbine to generate electricity at the sub sea reducing and or eliminating the need for the power quad element in the subsea umbilical. A subsea turbine will generate the power, typically 2 off 1,3 x 1,3 x 2 meter that will produce up to 200 Watt in a slow ocean or tidal current. The design will be based on the 12 years of design experience Norrønt a.s. Has on turbines, as shown on the patent pending turbine shown in Figure 1. The power would be stored in sub sea battery packs to ensure a steady and reliable source of power to subsea control module for operating the control module, generation of hydraulic power to accumulators and or electrical actuators, sensors etc. thus reducing the requirements to the power transmitting capability umbilical. By just reducing the electrical cables cross sections in the subsea umbilical a typical cost reduction of 10 pcnt may be achieved. For a typical field development this could range from 15 million NOK to 100 million NOK in CAPEX cost savings. In case hydraulic pipes also are eliminated and or reduced by introducing subsea hydraulic pumps powered by the turbine a significant saving of more than 5o pcnt can be achieved. There is an increased need for reducing costs in the offshore Oil and Gas and build and increase the level of using renewable energy in all phases of the life cycle associated with oil and gas production. Subsea umbilical?s are complex and expensive and contains hydraulic supply, power supply, fibre optics, chemicals and methanol/service line to a typical subsea manifold. Thus reducing this is CAPEX and OPEX for the umbilical and overall field development.