BiSN wel-lok Alloy Plug & Abandonment Solutions

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AB0, AB1 & AB2 Alloy barrier solutions for Plug & Abandonment

Page last modified
November 10 2025

BiSN's Wel-Lok Alloy Tools are a widely accepted solution for a single material barriers, these can be utilised as AB0, AB1 & AB2 solutions with extensive run history available to support 

Pros & Limitations
1
Preventative tool to seal annulus and eliminate future gas migration
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Non-corrosive bismuth alloy seals unaffected by H2S, CO2 or acids
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No moving parts for high reliability
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Customizable for API and non-API casing sizes
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Quick setting time
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Permanent sealing solution
Specification
Title Description
Theme/Discipline
Well ConstructionWell Operations
Core Tech
Hardware Tool
Inner Casing Sizes
4 1/2 in, 5 1/2 in, 6 5/8 in, 7 in, 9 5/8 in, 13 3/8 in
Outer Casing Sizes
7 in, 9 5/8 in, 10 3/4 in, 13 3/8 in, 20 in
Heater OD Sizes
3.5 in, 4.25 in, 4.5 in, 5.5 in, 7.625 in, 10.75 in
Pressure Rating
Up to 10,000 psi differential, 20,000 psi maximum tool rating
Temperature Range
0 - 175°C
Conveyance Methods
Eline, Slickline, Coiled Tubing, Drill Pipe
Casing Grades
All grades
Well Deviation
0 - 88° at setting depth
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BiSN is an oil and gas technology company founded in 2010 in the United Kingdom. The company develops engineered sealing solutions called "Performance Barrier Technologies" to help operators permanently seal wells and prevent leaks across the lifecycle of oil and gas wells, from drilling and completion through intervention and abandonment. BiSN's core technology is called wel-lok, which uses a thermite heating system to melt a proprietary bismuth alloy that seals leaks and cracks in wellbores. The company has grown to around 100 employees with facilities in North America, Europe, the Middle East, and Australia. BiSN's products have been used successfully in major oil and gas regions around the world. The company continues to innovate and expand its product portfolio to provide permanent sealing solutions for the challenges operators face at every stage of a well's lifecycle.

Country of Headquarters
United States
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