In-situ effects on ultrasonic gas flow meters

This paper describes the course of events which led to the discovery of a significant mis-measurement on Gjøa platform’s gas export from the operator's point of view.

The mis-measurement has persisted since Gjøa's start-up, almost five years ago. The paper closes with lessons learnt from a two year long investigation and tries to clear up some common misconceptionson ultrasonic gas flowmetering.