wel-lok TS
Provides a permanent seal in well abandonment
Page last modified
November 10 2025
wel-lok TS (Tubing Seal) utilizes a thermite reaction heater to melt proprietary bismuth-based alloys downhole. The melted alloys have a viscosity similar to water which allows them to flow into damaged or irregular tubulars and annular spaces. As the alloys cool and solidify, they expand to create a seamless, gas-tight seal that is non-corrosive and unaffected by H2S or CO2. The wel-lok TS provides a permanent tubing barrier for well abandonment applications. It can pass through small tubing restrictions to seal above perforations, leaks, or failed production packers. The wel-lok TS contains no moving parts and sets in a few hours, allowing rapid pressure testing. It is deployed on wireline or slickline and is customizable for all API and non-API casing sizes from 2 3/8” to 36”. With differential pressures up to 10,000 psi and temperatures up to 175°C, the wel-lok TS allows operators to permanently isolate zones and set gas-tight plugs across the life of a well. Its bismuth-based thermite technology overcomes limitations of traditional bridge plugs and other tubing barriers.
Pros & Limitations
1
Advanced bismuth alloy technology with expanding metal seals
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Non-elastomeric seals
1
Customizable for API and Non API Casing sizes
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No moving parts, therefore high reliability
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High expansion through tubing solutions available
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Quick setting time - ready to pressure test in hours
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Wireline deployable single trip solution
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Non-corrosive and not affected by H2S, CO2 or acids
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V0 Qualified ISO 14310 Gas Tight “Eternal” Barriers
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Reduced environmental impact
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Permanent solution
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Can seal in damaged, irregular or oval tubulars
Specification
| Title | Description |
|---|---|
| Theme/Discipline | Well OperationsWell Plug and Abandonment |
| Core Tech | Chemical |
|
Sealing Pressure
|
Up to 10,000 psi
|
|
Tool Pressure Rating
|
20,000 psi
|
|
Temperature Range
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0 - 175°C
|
|
Conveyance
|
Eline, Slickline, Coiled Tubing, Drill Pipe
|
|
Casing Compatibility
|
All grades
|
|
Well Deviation
|
0 - 86°
|
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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