SEA has delivered exceptional value on a range of projects for clients in the Asia-Pacific region, and extending around the world.

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.

Baltic Gas Pipeline Feed

Project Scope

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

SEA delivered value to CalEnergy Resources by developing:

  • A robust pipelines execution plan which helped guide the project in meeting the client goals and objectives on time and on budget
  • A pipeline delivery contracting strategy that allows the project to go forward into detail design with a clear roadmap towards FID and beyond
  • A pipeline constructibility strategy that provides maximum construction flexibility while maintaining an acceptable risk profile across all sections of the work scope
  • Accurate and achievable CAPEX and schedule estimates with which to take the project forward.

WHEATSTONE EPM SUPPORT

Project Scope

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

SEA delivered value to the Chevron Wheatstone scope of work through:

  • Secondment of highly experienced engineering and Management Personnel who possess a wealth of experience in subsea design and installation of subsea pipelines and production systems.
  • Providing proactive Management and Engineering Personnel who ensured the smooth transition from design to fabrication and construction delivering high levels of safety and quality.
  • Management of the StablePIPE JIP.

SUBSEA SYSTEMS LIFE EXTENSION

Project Scope

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 Delivered

SEA has delivered value to the VOGA Life Extension Project through:

  • Addressing and closing out key concerns raised by the original flexible manufacturer
  • Identifying all outstanding work required prior to life extension acceptance
  • Supporting the decision to extend flexible life, thus avoiding significant CAPEX costs associated with replacing the flexible flowlines
  • Providing a detailed roadmap of life extension activities for the next 2 years, including schedule and costs.

MOBILESPAN JIP

Project Scope

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

SEA delivered value to the JIP partners through the following outcomes:

  • Designing the MOBILEspan methodology to assess transient freespans, and guiding it through rigorous review with external subject matter experts (SMEs).
  • Advances in probabilistic assessment through the application of  Bayesian methods and cloud computing, to make otherwise prohibitive probabilistic analysis both feasible and economical.
  • Development of a calculation tool that captures the MOBILEspan approach, allowing span assessments to be performed that will significantly reduce OPEX for applicable pipelines.

PIPELINE DECOMMISSIONING

Project Scope

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

SEA delivered value to the operator’s team through:

  • Identifying the applicability of the STABLEpipe methodology
  • Combining a pipeline degradation model with stability criteria to quantify long term behaviour and inform the project risk assessment.
  • Delivering assessment outcomes to enable the abandon-in-place strategy, without the need for further deconstruction activities that may have ranged in cost from $1m to $100m
  • Delivering a comprehensive report with extended descriptions of methodology, required to convey outcomes to a non-technical audience.

MICRO-TUNNEL STUDY

Project Scope

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

SEA delivered value to Chevron through:

  • Demonstrating technical feasibility of an alternate solution that provides operational flexibility for staging future projects.
  • Prepared comparative risk and schedule reviews with subject matter experts for the available alternatives.
  • Demonstrated that the recommended solution met all technical, environmental and safety limitations posed by the beach crossing location.