SNE Development Architecture Study Phase 1
Location: West Africa
Xodus’ integrated approach to identify technical issues and conduct an option study called upon a variety of field development, subsea, process and environment expertise. Our ‘one team’ approach provided the client with a multi-disciplinary team of experts that seamlessly integrated within their own team in order to provide solutions that met and exceeded the client’s expectations. Our reputation to deliver has lead to the continued relationship with this client to deliver services to the subsequent phases of the study.
Capricorn Senegal Ltd (CSL) is seeking to identify, evaluate and select the preferred development concept for the deepwater SNE and FAN discoveries in the Sangomar Offshore Deep block offshore Senegal.
The field is located in water depths from 650m to 1300m and requires a high well count to recover the in-place volumes.
Appraisal well drilling and subsurface assessments are proceeding in parallel and there remains significant uncertainty on recovery.
The Assess stage study was conducted in two stages, the first investigated the key technical issues influencing the development and the second explored specific field architecture options and production cases.
Phase 1a: Key Studies
The key studies phase addressed the technical issues that would drive the field architecture and development of the field.
These were identified as:
+ Well Locations and Drilling Step Out Distances: opportunity to aggregate drill centers and reduce seabed infrastructure;
+ Production Assurance: Performance of alternative artificial lift methods and optimal thermal management for hydrate and wax;
+ Seabed Geophysical Constraints: primarily the influence of the canyon running through the center of the field
+ Corrosion Management and Material Selection: ~18mol% CO2 in the gas phase;
+ Host Vessel type: FPSO, Semi-submersible, Spar, TLP, Shallow water platform;
+ FPSO Mooring and Offloading Options – vessel storage capacity, motions/stability and production downtime during offloading;
+ Technology – focused on Subsea Pressure Boosting to address against poor reservoir performance outcome.
The results of the Key Studies guided the options considered in Phase 1b.
Phase 1b: Options Study
The second phase developed realistic options addressing:
+ Four main production scenarios (low, phased & un-phased mid, high);
+ Architecture sensitivities for east & west FPSO mooring
+ Gas Disposal (Reinjection, Export, Power Generation)
+ Tie-back of future discoveries / prospects.
The technical definition of each option was developed and preliminary cost and schedule estimates prepared.
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