A subsea well which was to be abandoned, had a live annulus which required to be isolated before the full abandonment could be safely completed. Isolation had to be achieved without damaging the external casing.
Five wells needed to be plugged in connection with shutdown of an abandoned platform gas field on the UKCS. The quality of the existing annular cement at the barrier locations was either unknown or believed to be poor.
HydraWell was asked to support the operator in a four well abandonment campaign for suspended subsea production gas wells at 115 metres water depth. A key challenge was to ensure a quick turnaround from a planning perspective, in readiness for the offshore operations.
