Petrobras' deepwater and ultra-deepwater subsea well interventions in offshore Brazil are performed using drill pipe risers (DPR). DPR joints are single rigid steel pipes. Service and control circuits are composed of independent lines, fixed to the work column (DPR pipe) by clamps and operated in open sea.

Currently, annular service lines use High Collapse Resistance hose (HCR – often with a metallic carcass) to allow access to the well annular spaces and circular and move fluids in the column; requiring both 10ksi internal pressure and collapse resistance to depths of 2500m

Furthermore, the DPR is not resident to any one field; rather it is an intervention system that serves may fields, operating from several rigs in Petrobras’ fleet. It has to be easily transported, assembled, and decommissioned for each operation. Therefore, it must comply with other requirements such as:

•     Compact due to limited deck space in the rig.
•     Light enough for ship-to-ship onboarding using the rig crane and compatible with traditional deck loads.
•     Allow mobilization in conventional MODUs without permanent adaptations or need to navigate to sheltered waters.
•     Flexible enough (low MBR) to accommodate several surface layouts, provide easy handling and quick installation to ensure operational safety and efficiency.
•     Allow the flow of heated water with temperatures up to 95°C for hydrate dissociation.
•     Compatible with workover fluids such as neutralized acids, sea water, nitrogen, MEG, diesel, ethyl alcohol and their additives.

Magma Global has been tasked with developing and qualifying a Thermoplastic Composite Pipe (TCP) as an alternative to HCR for use as an Annulus Service line, meeting DNV-ST-F119 standards. Rig-specific handling and installation tests are also underway to ensure smooth onboard implementation and operational viability.