The following pages present a selection of SEA’s recent projects, highlighting the value delivered and the key challenges faced by the engineering team.
Project execution is supported by SEA’s in-house project management procedures, ensuring excellence in execution regardless of complexity or size. Project delivery efforts are supported by SEA’s secure document management system, which provides clarity and control for all project deliverables, documents and correspondence. The lean project management procedures in place at SEA ensure that maximum effort is directed to the challenges of a project with a minimum of administration and overhead.
CalEnergy Resources in conjunction with LOTOS Petrobaltic S.A. is developing the Baltic Gas Project offshore Poland in ca. 70msw. SEA was commissioned to carry out the pipeline FEED work which includes the 85km B6 pipeline, the 28km B4 pipeline and a 1km long HDD section. The full FEED scope included mechanical design, the development of contracting strategies, constructibility reviews and the development of FEED level CAPEX estimates and delivery schedules for each key scope; shore approach and shore crossing, pipeline installation, trenching, platform tie-ins and risers.
SEA delivered value to CalEnergy Resources by developing:
The Wheatstone Development comprises a Subsea gathering system, production platform and 225km export pipeline to an onshore LNG plant. A total of 27 big bore subsea gas wells, large diameter CRA flowlines and multiple service lines will produce in excess of 1500mmcsfd over a 30 year design life. Design Scope incorporated feasibility and FEED engineering through to detailed design, cost and schedule delivery and procurement.
SEA delivered value to the Chevron Wheatstone scope of work through:
SEA was commissioned to investigate the feasibility of extending the service life of four original Wandoo flexible flowlines by 5 years beyond their original 20 year design life. The objectives of the feasibility study were to identify any potential barriers to extending the operational life of the flexibles and develop the associated risk profile for life extension. This study supported VOGA in making a high level decision on life extension versus flowline replacement.
Once the decision to extend life was made, VOGA requested that SEA prepare a Scope of Verification for approval by Lloyd’s Register.
SEA has delivered value to the VOGA Life Extension Project through:
Wave and current forces during a pipelines lifetime can scour the seabed beneath it, creating freespanning pipeline sections. These freespans must be analysed to assess their integrity. However standard assessment approaches are excessively conservative as they do not model the time-transient nature of the span configuration. This shortcoming in modelling leads to unnecessary freespan interventions, i.e. increased OPEX.
In 2013 SEA developed a concept to improve the analysis of transient spans and the understanding of their integrity. Together with the Industry Technology Facilitator (ITF), the MOBILEspan Joint Industry Project (JIP) was formed in 2013 in partnership with 4 multinational operators to develop this concept into a robust analysis methodology and calculation tool. The foundation of MOBILEspan’s success was that it combined diverse fields of existing knowledge and capability; span modelling, scour research and structural reliability analysis; to define a solution with a clear path to implementation.
SEA delivered value to the JIP partners through the following outcomes:
SEA was commissioned to develop an understanding of the stability behaviour of pipelines due to be abandoned in place. The overriding concern was the uncertainties surrounding longterm behaviour of the pipelines as they degrade over time, which may have presented challenges to the chosen strategy.
SEA was able to use local research outcomes from the STABLEpipe JIP to demonstrate that the pipeline ends needed no secondary stabilisation following abandonment, and that their behaviour as they degraded presented no significant consequence to surrounding assets or the environment. SEA’s analysis report supported the operator’s application to the regulator for the abandon in place strategy.
SEA delivered value to the operator’s team through:
SEA completed a concept and technical feasibility assessment for a multi-component micro-tunnel option for a beach crossing to support future Chevron projects. Micro-tunnel construction offers a density advantage for shore crossings, and can allow flexibility in usage even after tunnel construction has concluded. To avoid extending beyond allocated real estate at the shore crossing location, an alternative to HDD was required and SEA was able to leverage their experience with previous micro-tunnel construction to deliver a solution.
SEA assembled an experienced pipelines concept team, including specialist micro-tunnel and HDD consultants, to identify potential solutions and perform comparative risk and schedule reviews to develop a technically feasible solution for the range of future assets.
SEA delivered value to Chevron through: