Abandonment

Temporary Abandonment Cap

The Temporary Abandonment Cap (TA Cap) is a tool that is installed on top of a subsea wellhead in order to protect the critical surfaces from subsea growth and corrosion.

 

Features

Easy to install and remove

Steel construction

ISO 13628-8 ROV hot stab to pump preservation fluid into the TA Cap

Stinger allows fluid to be pumped deeper into the wellhead

Locking dogs that engage on H4 external locking profile

This is typically done when there is a significant period of time in between the drilling being completed on the well and the completion starting. Therefore, it can also be used to protect a wellhead after abandonment.

The TA Cap consists of a predominantly steel cap that is locked onto the wellhead using the H4 external locking profile. An ROV can be used to pump preservation fluid (i.e a corrosion inhibitor) into the cap. This is done to flush out any seawater and protect the wellhead.

The cap also includes a plastic stinger that protrudes into the internal cavity of the wellhead. This allows the preservation fluid to be pumped further into the wellhead depending on the relative buoyancy of the fluid when compared to seawater. Seals on the TA Cap keep the preservation fluid within the cap, but do not allow pressure to be contained within the cap.

The TA Cap is generally too heavy to be deployed from the surface using the ROV and normally requires the assistance of a Tugger winch or crane. The ROV guides the TA Cap onto the wellhead and locks it into place prior to pumping preservation fluid into the cap.

Datasheet

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