DORIS provided the basis of design of the pipeline network, defined and evaluated the Electric Heated Pipeline system
Lianzi well spacing and terrain features created technical challenges for flow assurance and operability.
Traditional hydrate mitigation methods such as blowdown and dead oil circulation were not feasible given the offset distance, large uphill slope, and host type.
The design of an electrically heated single production flowline system reduced cost and improved operability. An electrical power cable connected to the far end of the flowline provides direct heating in a circuit powered and controlled on topsides. Flowline heating is initiated during shutdown to maintain the production fluids above hydrate formation temperature, thus avoiding the need for blowdown or dead oil circulation.
Electric heating can also be used to raise the temperature of the flowline fluids during startup operations.
Services provided by DORIS:
- Subsea production system definition
- Subsea equipment and production controls definition
- Flowline design parameters for production, water injection, and gas lift lines
- Flow assurance and operability analyses
- Electric heated flowline definition
- CapEx and schedule estimates
- Subsea testing and commissioning plans
- Water Depth: 390 – 1,050 meters
- Production Facilities: Tie-back to the Benguela-Belize Compliant Tower
- Oil Production: 50,000 BOPD
- Gas Production: 60 MMSCFD
- Number of Wells: 3 Producers, 3 Water Injectors