Abu Dhabi-based AD Ports Group has signed a 25 years agreement with Singapore-based Crystal Offshore a logistics solution provider to the marine & offshore Industry to build an offshore rig and vessel repair base in Abu Dhabi's Khalifa Port.Under the agreement, a 20,000 square meter plot of land and an associated quay wall in Abu Dhabi's Khalifa Port will be allocated for Crystal Offshore to construct a base…