Well-Set has filed a patent application covering new technology which provides a mechanical base for an abandonment barrier to be set inside casing or liner, and incorporates technology to allow the abandonment barrier to be verified by pressure testing from below. The abandonment barrier could be formed from cement, resin or other novel abandonment materials such as thermite.
This technology will also be developed for thru-tubing deployment.
Currently, no technique exists to verify a permanent well barrier from below, via a pressure test performed in the direction of potential flow towards the external environment. It is therefore almost impossible to accurately differentiate between a pressure test applied to a mechanical barrier from above, and a subsequent pressure test applied to a well barrier (cement plug) set above the mechanical barrier. Our technology facilitates discrete verification, thereby allowing permanent abandonment plugs to be set on top of mechanical barriers and independently verified.