SEA PROJECTS

SEA has delivered exceptional value on a range of projects for clients globally.

The following pages present a small sample 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.

SEA maintains accreditation in ISO 14001, ISO 9001 and ISO 45001 for Environmental Management, Quality Assurance and Occupational Health and Safety respectively.

FIELD DEVELOPMENT STUDIES

Project Scope

A multinational operator has engaged with SEA to develop digital models of their Australian assets to improve the data analysis and decision quality leading to improved operability and reduced intervention costs. Following the great outcomes in the operate phase, our Client has leveraged SEA’s ICE Platform to assist with integrated field development planning to extend the plateau of the existing assets and integrate new assets while reducing project delivery time, cost and carbon dioxide (CO2) footprints of these projects.

Developing these fields presents complex multi-discipline engineering challenges. The future fields bring steady state and transient flow assurance challenges due to the large scarp crossing and liquid handling constraints with subsea compression, construction challenges with the subsea architecture and subsea equipment that needs to be installed and the large range of development options that need to be systematically and intelligently assessed to identify optimal performance.

The project benefits greatly from the system optimisation capabilities of the ICE Platform and the automated engineering workflows that SEA develops. SEA has delivered steady state and transient thermal and hydraulic analysis integrated with corrosion modelling, mechanical design and installation / construction analyses to enable system optimisation across a much wider case matrix and in much greater fidelity than traditional engineering methods permit. This has greatly improved the decision quality while improving the assessment cycle time, reducing overall project cost and reducing the execution schedule.

SUBSEA CABLE IN-PLACE ANALYSIS

Project Scope

SEA was engaged by a contractor to perform detailed analysis for the storm response of a subsea power cable, servicing an offshore wind farm in shallow water in western Europe.

Previous results from simplified analyses suggested the need for significant intervention work to be performed, with subsequent impacts to project schedule and budget. Detailed analysis of the entire cable route under a variety of storm conditions was performed by SEA using the ICE Platform, which includes detailed soil and hydrodynamic models to allow high-fidelity analysis of the cable response. Analysis included the effects of 3D seabed features, route bends, and non-linear cable properties, which had a significant impact on cable on-bottom stability.

SEA Delivered

SEA delivered value to the subsea cable contractor through the following outcomes:

  • Delivering large volumes of high fidelity finite element analysis in a short timeframe
  • Interpretation of available project metocean and geotechnical data to construct detailed inputs of soil resistance and hydrodynamic loads.
  • Providing results to capture possible displacement outcomes, including spatially defining predicted displacement in response to varying seabed and environmental features.

SUBSEA PIPELINE EXECUTION AND INTEGRITY

Project Scope

SEA was engaged by a multinational operator for assistance in demonstrating operational integrity for a newly installed subsea system due to late design changes.

SEA performed detailed automated analysis throughout the construction phase, using the best available design and construction data, to determine the integrity of the asset through design life. Analysis scope included weld ECA, slugging and fatigue performance at buckle initiators, along with retroactive simulation of the complete pipelay procedure to quantify actual consumed fatigue damage along the pipeline route.

SEA continue to be active in assisting the operator in ongoing integrity management of the pipeline, including updates for slugging, buckling, spanning and corrosion. This engagement provides confirmation of current integrity, along with assessment of forecast future conditions. Beyond this, SEA have also been engaged to apply their broader knowledge of the subsea architecture to perform the automated construction of reliability modelling for the asset using the digital twin.

SEA Delivered

  • Detailed re-analysis of the pipeline during construction phase to demonstrate integrity for the design life following late changes to design information.
  • Addressed and closed out buckling integrity assurance due to exceeding design assumptions for process cycling in early life, enabling operator to retain the full field design life.
  • Full fidelity slugging analysis allowing identification of operating regimes that will result in unacceptable fatigue accumulation, inclusive of correlating accelerometer data to structural models and computing high resolution fatigue mapping
  • Supported decisions on inspection and data retrieval frequency.
  • Providing metrics for future anomaly assessment and integrity assurance across a broad range of potential production modes.

FSO Pre-FEED STUDY

Project Scope

SEA was engaged to perform a detailed Pre-FEED study of a potential FSO deployment in Asia for multinational operator. The delivery schedule for the project required a higher level of technical assurance than would normally be required in Pre-FEED, which SEA delivered through the use of integrated, automated modelling techniques that combined risers, hull and moorings in a single model, allowing development of all elements together as a system. The unique characteristics of the project required a high-availability design to mitigate risks associated with upstream system shutdown and repair planning.

SEA Delivered

  • Accelerated concept evaluation and selection for riser and mooring configurations on a shallow water FSO.
  • System design and construction sequence development to minimize critical-path construction activities and associated commissioning risks.
  • Detailed characterization of floating system options using 5-year historical metocean dataset to improve decision confidence and eliminate unnecessary investigations early in the project.
  • Robust CAPEX, OPEX and project schedule information to enable evaluation against alternative concepts.

DEEP WATER HPHT TIEBACK

Project Scope

SEA was engaged by a major multinational operator to perform Pre-FEED engineering assessment of a deep water (2000m), high temperature, high pressure oil field in the Gulf of Mexico, for a tie-back option to an existing semisubmersible production facility.

The scope of the work included an automated, integrated approach to system design, with steady state and transient flow assurance, pipeline mechanical design and jumper assessment. Use of the ICE Platform enabled the project to be executed using a small team on a tight timeframe, but also achieve a high level of detail typically more common in later project phases.

SEA Delivered

  • Delivering an integrated system design with flow assurance, mechanical pipeline design and jumper assessment, e.g. transient temperature profiles from flow assurance analysis feed directly into the pipeline walking assessment.
  • Refinement of the riser and jumper lengths for optimal thermal performance of the system.
    Wall thickness selection, on-bottom roughness, walking and buckling assessment.
  • Slugging analysis for multiple production profiles against the life of the field.
  • Production profile verification against system thermo-hydraulic performance.

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.