Permanently Seal Multiple Annuli

In well abandonment operations, it is required that there are no bubbles coming from any casing string before the casings can be cut and removed for permanent abandonment. When gas bubbles are migrating through a cemented annulus, or multiple annuli, this can be difficult to remediate. Section milling and placing a cement plug in the section milled window is costly and not always effective as the gas that has migrated through the existing cement can also cut the new cement placed in the well.

Wel-lok™ offers a V0 qualified plug that is significantly shorter than cement plugs, reducing the time and cost associated with milling long windows with a proven track record of success, eliminating the potential that the well will have to be re-abandoned at a later date.

Bismuth alloys expand when they solidify, eliminating the possibility of micro-annuli forming and providing a permanent solution the first time, every time, as opposed to cements and resins which shrink. As environmentally friendly barriers, in addition to time and cost savings they also reduce carbon emissions caused by cement and rigs.