APRIL 2024

NSTA CCUS Guidance references Accord papers

Rebecca MacKenzie

Published by
Rebecca MacKenzie

Carbon Capture and Storage (CCS) is seen as critical to UK ambitions of net zero and the UK government have set targets for 2030. There are 27 licences in the UKCS with numerous projects in development. To help the developing carbon storage industry prepare, the North Sea Transition Authority, NSTA, has published Guidance for the measurement of CO2 relating to injection flow rates and gas composition which must be accurately determined to support modelling the behaviour of the CO2 in the reservoir.

The guidance includes two references to papers authored by Accord's Phil Stockton and Allan Wilson.

Cost Benefit Analyses in Design of Allocation Systems derives an equation to determine the Integrated Risked Exposure which, in the Guidance, the NSTA recommend is used to determine the level of financial exposure resulting from a given level of measurement uncertainty. Phil revisited this paper at the 2022 Global Flow Measurement Workshop, in his paper, Further Adventures in Integrated Risk Exposure for Cost Benefit Analysis from Economics to Quarks expanding on the underlying basis of the approach.

The second paper which is referenced in the Guidance, 2021 Meeting the Challenges of CO2 Measurement with New Kind of Orifice Meter, considers the challenges presented by the physical properties of CO2 and the common presence of impurities and presents a new flowrate equation for an orifice plate measurement.

More information on the challenges CCS will bring, from an allocation perspective, can also be found in this 2022 presentation - Allocation for Carbon Capture and Storage.

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