Tomorrow’s Engineered Sealing Solutions, Today.

Innovative sealing solutions for Oil & Gas operators.
Perfected by science.
Proven in the field.

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Engineered Sealing Solutions:
Seal Safer, Protect Forever.

BiSN’s innovative bismuth-based sealing technologies – wel-lokTM extend the life of your well and permanently solve downhole flow issues so you can maximize production from all your assets.

Sealing methods that use non-permanent materials alone such as cement, elastomers and resins cannot solve well issues like water production and gas migration reliably for the long term.

BiSN’s unique field-proven Performance Barrier Technologies allow operators to solve unwanted downhole flow issues once and for all – sealing across the life of the well with confidence to assure uptime, improve production, extend well life and ultimately to abandon safely, and forever.

Discover BiSN Technology

Engineered Sealing Solutions:
Seal Safer, Protect Forever.

BiSN wel-lok™ technology is better than traditional cement solutions for the environment as it creates a permanent sealing solution.

A Barrier that impacts your costs.
Not the environment.

Developing unmatched Performance Barrier Technologies that deliver a superior seal that endures demands original thinking in materials science, engineering and manufacturing.

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BiSN Sustainable Oil Well Plugs

Applications for wel-lok™

Bismuth-based alloy barriers. Led by innovation. Made possible by perfected thermite chemical reaction heaters and unique conveyance methods. For the life of your well, and beyond.

Protecting your production, your people and the environment for the long term demands operators can hold back downhole liquids and gases reliably and definitively.

Performance Barrier Technologies from BiSN utilize patented sealing alloys — enabling precise placement of a high endurance, gas-tight seal.

Well Completion - BiSN

Well Completion

Elastomer seals and cement have been used for decades to seal the annulus between casings yet they have a high failure rate. Remediation using cement or resin squeezes leads to expensive, difficult and unreliable workovers. Now you can take preventative action by installing wel-lokTM at completion and rest easy should traditional technology fail that you can remediate fast and at a low cost.
BiSN Well Intervention

Well Intervention

Take decisive action to resolve well issues rapidly and safely enhancing your production and maximising the producing life of your assets. BiSN Performance Barrier Technologies make it possible to isolate zones shutting off water production, repair damaged tubing or casing, repair leaking production packers, seal perforations, permanently seal multiple annuli and eliminate gas migration and casing pressure, plus many more….
BiSN Well Plug and Abandonment

Well Plug & Abandonment

Seal Safer, Protect Forever. Once. Elastomer and cement plugs deteriorate over time and with liability attached and release never a given, even after sale, obligations can remain around future decommissioning costs. Our patented wel-lok™ technology ensures the permanent plugging and abandonment of oil and gas wells. Eliminate corporate liability with a gas-tight seal using alloys and abandon with confidence.


Bismuth-based alloy well solutions. Led by innovation. Powered by thermite.

Performance Barrier Technologies from BiSN utilize patented sealing alloys — enabling precise placement of a high endurance, gas-tight seal.

Learn about the Technology


Bismuth Alloy - the secret to permanently sealing oil wells.
BiSN Chevron BackgroundBiSN Chevron backdrop

Global Deployments

Innovation travels fast and reaches far. As BiSN’s reputation grows, so do our success stories of increased oil and gas production, interventions and permanent plug & abandonments. More than ever before, businesses around the globe are benefitting from our faster, safer engineered sealing solutions.

See our worldwide deployments
BiSN has field proven, commercial global deployment experience.BiSN has field proven, commercial global deployment experience.

Engineering the Future and
Delivering Excellence

Businesses worldwide are benefitting from our innovative sealing solutions.

Case Studies

Our performance barrier technologies have been proven in the field hundreds of times across all regions, onshore and offshore, high pressure/temperature/deviation sealing casing/tubing from 3.5”OD to 30”OD. Discover the range of downhole challenges faced by operators, and how BiSN has helped address them.

The largest bismuth plug set to date being deployed by liftboat from BiSN

Project Atlas: The biggest bismuth plug ever deployed

BiSN sets largest wel-lok™ plug in the world for a super major operator in the Gulf of Mexico.
Largest to date bismuth plug with Aker BP

BiSN collaborates with Aker BP on successful 30 well P&A campaign

Following up with Aker BP after 2 years of monitoring and testing.
BiSN field engineer in the field in Mozabmique

BiSN Collaborates with Sasol for Permanent Abandonment in Mozambique

BiSN collaborated with the major operator Sasol in Mozambique to successfully qualify the wel-lok™ CRT tool to begin the partnership ahead of a campaign in the country.

wel-lokTM in Action

Videos explaining the BiSN Technology.

Shut off water producing zones with the Water Shut Off (WSO) tool, seal through multiple annuli in a single run with the Seal Through Casing (STC) tool, repair leaking production packers with the Packer Repair Tool (PRT), plus many more….

Stay ahead of the curve and learn how wel-lok™ can augment your current remediation and abandonment processes.

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wel-lok™ Water Shut Off (WSO)

wel-lok™ Water Shut Off (WSO)

BiSN’s wel-lok™ WSO in wells tool is the next step in well solutions technology. Patented and proven in the field, this revolutionary tool reduces unwanted water production from wells that have sand screen and open hole gravel pack completions (OHGP).
wel-lok™ Seal Through Casing (STC)

wel-lok™ Seal Through Casing (STC)

The wel-lok™ STC has been developed to achieve a gas tight V0 seal well annuli that cannot be achieved by traditional cement balance plugs.
wel-lok™ Cement Repair Tool (CRT)

wel-lok™ Cement Repair Tool (CRT)

Our wel-lok™ CRT eliminates casing pressure and vent flow in cemented annuli. While traditional methods of perf and squeeze require surface pumping pressure, our CRT solutions are designed to run rigless on electric line to eliminate gas migration in minutes.
wel-lok™ Packer Repair Tool (PRT)

wel-lok™ Packer Repair Tool (PRT)

The BiSN wel-lok™ PRT is designed to quickly repair a leaking production packer by sealing the casing annulus to create a new, enduring seal in the production tubing.
BiSN - Active Deployments Across the Globe

Technology Patents

Get in touch to find a permanent sealing solution for your well

Businesses worldwide are benefitting from BiSN's well services in the field. Contact us today and embrace tomorrow's engineered sealing solution, today.

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