RE: OGA August figures sweep23 Nov 2020 11:52
Cynders - there may be a process diagram somewhere in the planning application (s) but it really doesn't matter as you say what counts is what is receipted and paid for.
The Energy Institute publishes annual figures for losses in transportation worldwide but that seem s to be mainly sea going VLCC's were the rates are a lot less than 1% loss per voyage. The receiving refinery will have a spec which the HH oil deliveries have to meet - this will almost certainly be weighted towards Wytch Farm given its destination. Somewhere I'm sure someone has said HH crudes meets a high spec
The OGA numbers are in accordance with:-
https://www.ogauthority.co.uk/media/6235/oga-metering-guidelines-2019_revised_dec-19.pdf
3.2.1 Direct measurement approaches may be regarded as adopting the following hierarchy (in ascending order of measurement uncertainty):
(i) Continuous single-phase measurement of each phase, post-separation, in dedicated meter runs designed to minimise
measurement uncertainty.
(ii) Continuous, nominally single-phase,measurement of each phase on the oil, gas and water off-takes of a dedicated separator.
(iii) Continuous multiphase or wet gas measurement via a dedicated flow meter, installed either topsides or subsea
multiphase.
(iv) Intermittent, nominally single-phase, measurement of each phase on the oil, gas and water off-takes of a test separator, with interpolation of the flow rates of each phase during the periods between these ‘well-tests’ – ‘flow sampling’.
3.2.2 In some circumstances, a ‘by difference’ solution may be appropriate, provided the field in question is a relatively large proportion of the commingled total.
3.2.3 The optimal measurement solution is one where the desirability of low measurement uncertainty is weighed against the economics of the field development in question.