Well Integrity

Bismuth Plugs

Rawwater's innovative sealing technologies use bismuth-based alloys and offer a very real and cost-effective alternative to traditional well plugging techniques. Originally developed as front-line, high integrity metal-to-metal seals, they can also be despatched to the top of seeping cement plugs to reseal wells and restore integrity.

At our UK technology centre, we are designing and qualifying high integrity, large diameter offshore plugs and expanding metal seals to meet industry demands for plugging and abandonment, zonal isolation and well integrity management.

3,000 years and counting

We invented the Bismuth Plug and recently developed the world's first anticipated 3,000-year-life underwater cast metal seal. We have a large corrosion and creep database regarding the use of underwater cast bismuth alloys and have carried out more than 100 workshop trials using novel alloys specifically formulated for plugging and abandonment. We have successfully deployed bismuth alloy seals in onshore wells in Alberta, Canada, at 1000' depth and 1000psi pressure differential. A world-first in metal-to-metal plugging technology, the deployment resulted in the launch of a Joint Industry Project to develop offshore plugging and abandonment tools. This was supported by the UK Government and an international consortium of oil operators.

7" alloy plugs rated to 6000psi

To confirm offshore capability and extreme reliability, we completed a two-year programme to deliver 7" plugging & abandonment alloy plugs for deployment in the North Sea. Rated to 6000 psi differential pressure, and with an effective seal of 560 mm (22") in length, they replace 30 metres (100ft) of traditional cement plugging. Extensive development and testing took place in collaboration with an operator consortium and the UK Government to develop the formulation of the metal seals. The mechanical properties and creep behaviour of the alloy under service pressure/temperature conditions were verified through an OGIC-funded partnership with the University of Aberdeen.

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Oil well

The very same material technologies that are used to create Rawwater well plugging and abandonment techniques can be used in a range of downhole applications.

Bismuth Alloy

Bismuth alloys - plugging with integrity