The historical operations at the Stag field have seen the inclusion of a floating, storage, and off take (FSO) vessel, which has been moored in field and receives production oil from the central production facility (CPF), and then off take to the cargo to a third-party tanker.
Recent operational and commercial developments have seen a shift to an operating model that requires only a third-party tanker and thereby permanent relinquishment of the FSO field.
As a result, the Stag field environment plan has bee revised, with the changes including: description of the third-party tanker; inclusion of waste incineration; and further information provided on the risk management associated with marine pest introduction.
The changes also listed are the reduction in the spill volume in the scenario of a vessel collision resulting in release of crude oil to sea; and minor changes including updates to priority receptors, volumes ashore and resourcing of response strategies to reflect revised modelling for the worst‐case credible spill scenario.
The Stag field production and export facility is located in permit WA-15-L, located in 49m water depth, and produces oil forms he Stag reservoir.
“Oil is loaded continuously to the third‐party tanker at a production rate of up to 4,000 barrels a day. The CPF has been in production since 1998 with only minor modifications carried out during this time,” Jadestone outlined in its environment plan.
Stag oil is a medium crude with a very low proportion of volatile compounds due to microbial degradation within the reservoir.
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