WELLBORE SEALING USING M3 BISMUTH ALLOYS
Improved sealing technologies for the energy industries
One of the most challenging aspects of developing a bismuth plug is the tool string necessary to deploy the plug downhole – In particular how to provide sufficient heat to melt the alloy once at the required depth.
The typical approach for the downhole heating of alloys is to use an exothermic chemical reaction – namely derivatives of Thermite. These burn incredibly hot. Custom formulations can be dampened and controlled up to a point. However, these still burn pretty quick and hot – and this can cause many issues.
Wellstrøm has developed electrical heaters and cables with sufficient strength and capacity to provide a controllable heating solution – operating at much lower temperatures for a longer time, slowly warm-up the casing, annulus and even the formation if required.
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