Enhanced Subsea Gas Tieback Project Targets Cutting Costs, Emissions

Bringing down costs and greenhouse-gas (GHG) emissions remain among the top priorities for offshore operators. At the same time, operators want to tap hard-to-reach reserves.

The Enhanced Subsea Gas Tieback Project, led by Intecsea, Worley’s specialist subsea business, could help with all of that.

The Enhanced Subsea Gas Tieback Project aims to cut estimated operational CO₂ emissions from gas fields by more than 90%, while eliminating the need for topsides and compression, according to the company. The project uses a pseudo dry gas (PDG) system, which separates natural gas from condensate and water in the production stream at singular or multiple locations.

“By changing the shape of the resistance curve within the gas tieback from a quadratic function to a linear function, the system becomes significantly more energy efficient in the use of the natural reservoir pressure, dramatically lowering the flowing pressure within the pipeline,” Lee Thomas, Intecsea's lead development engineer, told Hart Energy. “This, in turn, becomes a force multiplier within the system for additional beneficial effects.”