Luxembourg-based offshore energy and dredging services company Jan De Nul Group has completed the cable installation scope for the Phase II full field development of ADNOC’s NASR offshore oil field, located 130 km off the coast of Abu Dhabi.
The cable-laying project is part of ADNOC’s development programme to increase the field’s capacity to 65,000 barrels of oil per day (b/d).
Under a subcontract from Hyundai Heavy Industries, Jan De Nul Group completed the cable loading, transport, laying and protection of three 132-kV subsea power cables with a total length 147 km and 10 11-kV subsea power cables with a total length of 57 km.
Jan De Nul deployed cable-laying vessel Isaac Newton with dynamic positioning class 2 capability to transport and install 204 km of cable at the NASR offshore field project site. In cable-laying mode, Isaac Newton can install up to 10,700 tonnes of cable using a 7,400-tonne capacity turntable above deck and a 5,000-tonne capacity turntable below deck along with two tensioners, chute and auxiliary equipment.
The longest and heaviest of the 132 kV cables, with a length of 71 km and weight of 6,000 tonnes, was transported and installed by Isaac Newton in a single length between Das Island and the NASR field.
In its first project, subsea rock installation vessel Daniel Bernoulli executed the full cable protection scope including 53 km of post-lay trenching, installing 671 concrete mattresses and 8 km of rock berm installation, which was designed in-house by Jan De Nul Group.