Rather than increasing the pressure rating of the outer riser, POS-GRIP allows an inner casing liner to be temporarily installed, creating full HPHT capability all the way from the subsea wellhead to the surface BOP. The pressure retaining well control string is isolated from environmental conditions via an external secondary high-pressure riser conduit.
It’s run on field-proven HPHT technology utilising all metal to metal gas-tight seals. The HPHT casing liner can be either connected to the subsea wellhead casing hanger or a high-pressure POS-GRIP riser spool on top of the subsea connector. The benefits of using an Aquaterra Energy HPHT riser system include:
- Safe effective drilling, completion, workover and abandonment activities to be completed on subsea wells via a jack-up rig
- Provides a structurally sound, pressure retaining conduit
- Capable of withstanding environmental and operational conditions expected during the full HPHT service life
- Allows jack-up drilled HPHT exploration well to be converted into producers (via subsea completion)
At Aquaterra Energy, our team will handle the complete scope of riser system supply, including analysis, structural design, FEA, project management, QHSE, inspection, testing, offshore procedure optimisation and the offshore installation.