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BiSN Downhole Sealing Solutions

BiSN is a leading provider of metal to metal downhole sealing solutions to the oil and gas industry, utilising our groundbreaking modified thermite heater. We are breaking the mould of traditional elastomer seals and cement.

Downhole Sealing Solutions Provider

BiSN is bringing new perspectives to solve age old problems in oil and gas downhole sealing solutions technology. BiSN has manufacturing and assembly facilities in the North West England, UK and Houston USA, as well as an office location in Calgary, Canada. The UK also has a specialist alloy development laboratory and the US has a Thermite specialist team.


The Houston site opened in 2015 and comprises a 30,000 sq ft testing facility, with the capability to pressure test at up to 10,000psi and 150°C. Adding to the ever rising credibility of BiSN we were the winners of the 2017 ICOTA Innovation Award and in March 2018 we were awarded the Innovator Award and Great Company Award (SME) at the Offshore Achievement Awards (OAA).

What is the BiSN Technology?

The uniquely developed BiSN technology is called Wel-lok M2M™. Simply put this means sealing the well with metal to metal. It has been run in numerous locations around the world in both on and offshore environments, see some of our case studies for more details.


Using bismuth based alloys to seal in downhole conditions was first tried by the Schlumberger brothers back in 1930s, using electrical heaters. It was continually tried using electrical heaters through the 1960s to 1990s, but without realistic practical implementation due to the time it takes for the heating process to take effect, as well as limitations on deployment depth and the specialist wireline equipment required to run the electrical heaters at that time.


What we do differently at BiSN is we use modified thermite heaters, which makes this a game changing technology reducing the heating time required from hours to minutes and eliminates the need for any specialist wireline equipment, with no restriction on deployment depth.

Key Benefits of
Wel-lok M2M™

Safer than traditional plugging and sealing methods

Improved environmental implications

Extends the life of the well

Helps to increase the ratio of oil to water extracted

Reversible Sealing Solution without drilling out

Increased productivity = increased profit

Increased efficiency = increased profit

downhole sealing solutions

How does it work?

Using a modified thermite powered chemical reaction heater may sound scientifically technical and whilst the concept is innovative, it is relatively easy to explain;

The bismuth based alloys are run in hole (RIH) using various tools depending on the application

Once located at the depth in the well where the sealing is required, a modified thermite powered chemical reaction heater is utilised to heat the alloy until it melts. The chemical reaction heater can be run on any standard wire equipment without the need for any modifications. The power required to start the reaction is 240 volts and 60 millamps for approximately 15 seconds

The molten alloy has a viscosity similar to water which allows it to flow and fill the void it is intended to seal.

It then sets as it cools producing seamless downhole sealing solutions for a variety of applications within 30 minutes. This unique sealing technology can be applied in the drilling, completions, interventions or abandonment stages of a well.

Innovative and Reactive

Our key attribute is our employees, BiSN is an innovative and dynamic organisation providing new solutions to some age old problems within the oil and gas industry. We are able to react to market demands and our engineers are finding multiple applications for our unique sealing Wel-lok M2M™ technology.

Research and development creating solutions for our partners

As world leaders in the use of bismuth based alloys and thermite in the downhole environment BiSN has a portfolio of products aimed at tackling some of the most difficult issues faced by the oil and gas industry. We pride ourselves in building a responsive long term working relationship with our customers and working closely with them to provide innovative solutions.

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In summary

BiSN has developed a revolutionary chemical reaction heater that brings the technology into the 21st century and opens the door to a range of applications previously thought impossible. This new and unique technology is changing the way downhole sealing has been carried out for over 100 years.

Whether you are a field, interventions or completions engineer, or if you are involved in the planning of complex P&A operations, we believe at BiSN that with the
Wel-lok M2M™ technology, you are looking at the future solution for all downhole sealing and plugging problems.