Case Study Removing 30 Year Old Subsea TA Caps to Facilitate Well Abandonment Project: A subsea well in the Dutch sector of the southern North Sea had been suspended for over thirty years. The operator wished to abandon the well so a suite of tools were required that would seal on and pull a set of temporary abandonment (TA) caps. The 13-3/8” TA cap needed a tool which would seal onto the cap in order to stab a back pressure valve (BPV) to vent any pressure up through the drill string. A secondary means of holding pressure in the event that the existing BPV would not re-seal was also required, with the option to leave the system in place if needed and re-latch on at a later date. Solution: Unity designed a Pulling Tool which could: • Locate and latch a torque pin on the TA cap. •

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