PWC® Shaves Five Days off P&A Campaign

Key facts
Customer: Undisclosed supermajor
Location: Central North Sea, UKCS
Well type: Subsea production gas wells
Key benefits: PWC® solution eliminated five days from the estimated operational timings

The customer’s challenge
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 semi-submersible drilling rig was used for the campaign.
A key challenge was to ensure a quick turnaround from a planning perspective, in readiness for the offshore operations. Among the operator’s key objectives were to remove unnecessary scope, reduce costs and lower HSE exposure.

The HydraWell solution
PWC® (perforate, wash, cement) was performed on all wells, using HydraWell’s HydraHemera™ tool. This was the operator’s first deployment of the PWC® method on a subsea well. The single trip method was applied on two of the wells, while a two-trip was required on the two others.
As per defined barrier requirements, these operations delivered a 250ft annular barrier with 800ft of internal cement plug.

The result
Rock-to-rock barriers were successfully set. Compared to the operator’s previous P&A campaigns, which incorporated section milling, HydraWell’s PWC® method removed 5-6 days from the original annulus remediation timing.
The quickest PWC® operation on this sequence was 44 hours, while the rest were executed between 52 and 62 hours.
Using the PWC® method also removed multiple HSE risks including reduction of lifts, removal of swarf handling, no swarf damage to equipment and no swarf disposal.

More Case Studies

Talk to our experts

Tom Leeson
White Paper_Well abandonment planning_The risks and how to avoid them

An introductory White Paper

Well Abandonment Planning

- The risks and how to avoid them


->> Fill in your details and get your copy now: