NTF11797 – Incident details

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Woodside Energy Global Pty Ltd reported a notifiable incident (NTF11797) on 9 October 2022 involving a gas leak from the Crosby 3H1 subsea Christmas Tree at the Pyrenees facility offshore Western Australia. During remotely operated vehicle operations, gas bubbles were observed rising from the equipment, initially at a rate of 50-60 bubbles every 30 seconds. The well was offline and isolated following detection. NOPSEMA classified the incident as a dangerous occurrence involving damage to safety-critical equipment. Investigation identified a leaking stem seal on the crossover valve as the probable cause. Woodside submitted its initial incident report on 10 October 2022, which NOPSEMA reviewed on 21 October 2022. The incident was escalated to level 1 inspection on 11 October 2022.