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Worley’s INTECSEA partners with oil and gas technology centre on pseudo dry gas liquid removal technology

Published by , Digital Editorial Assistant
Oilfield Technology,

Worley’s INTECSEA consultancy has partnered with the oil and gas technology centre (OGTC) to fund prototype testing of its pseudo dry gas (PDG) liquid removal system.

This new technology has been developed to make long distance subsea tiebacks, which are not typically economic or technically feasible, commercially viable. By reducing back pressure in the pipeline, the technology eliminates the need for topsides and compression, reducing the associated high carbon emissions. This allows for much greater tie-back distances.

The prototype testing is based on a strong techno-economic concept study, also funded through the OGTC and was recently completed in March 2019. The study has already demonstrated the system’s unparalleled recovery levels, providing an additional US$10 billion in revenue over the alternatives – resulting in the strongest economic performance for a known stranded gas basin, North of the Shetland Islands. The study also demonstrated that upstream CO2 emissions were reduced by 65 - 80%, significantly reducing the environmental footprint.

An additional application for PDG that was studied as part of the original OGTC scope was gas disposal for small oil pool developments. This also provides a stand-alone economic case with significant follow through benefits for ‘normally unmanned’ facilities, due to the removal of high maintenance topside gas processing equipment.

The results of both these studies have driven the technology development forward with wider industry support, including a six-inch scaled prototype of the liquid removal unit, which will be tested over a six-month period at Cranfield University’s flow loop facilities. It will simulate the expected flow conditions typically found within a gas / gas condensate subsea tie back system to demonstrate the liquid removal efficiencies and hence provide confidence in the macro flow assurance.

Lee Thomas, INTECSEA’s engineering lead for PDG technology, anticipates that the prototype testing will raise the technology readiness level to the point where a pilot project can be considered viable via a programme of enhanced factory acceptance testing for an integrated unit.

Commenting on the project, Thomas said: “The solution is elegantly simple; it uses multiple passive liquid removal units and a liquid disposal pipeline connected to proven standardized pumps. I am delighted that the OGTC’s funding will allow us to move from computer-based simulations, through to physical testing, with a diverse range of Operators and Tier 1 contractors, demonstrating industry collaboration at its best.”

Graeme Rogerson, marginal developments project manager for the OGTC, added: "There are over 360 marginal developments in the UK Continental Shelf, with approximately 3-50 million barrels of untapped oil and gas. Technology development is key to unlocking this potential and why we are excited to support Worley’s INTECSEA in developing its Pseudo Dry Gas system, improving reserves recovery while reducing the industry’s carbon footprint.”

The search will soon begin for an operator willing to undertake a pilot project of an integrated unit.

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