High Expansion Bridge Plugs:
Well Plugging Solution from BiSN

Bridge plugs are used in oil and gas drilling, either to stop-up a well when it’s no longer in use, or when sections of a well need to be isolated. They are generally made of steel, cast iron or cement and are deployed via a rig, coiled tubing, electric line or slickline. Depending on the requirement, bridge plugs can work as a permanent or a temporary solution. 


Temporary, or ‘retrievable’, bridge plugs are often used during maintenance to a well. They block crude oil, gas or pressure from affecting upper parts of the well so they can be repaired, treated or worked on. Permanent bridge plugs are used in well-abandonment, when wells are closed indefinitely at the end of their useful lifespan. 


The key for a successful bridge plug is that it creates a seal that can withstand pressure, and is quick and easy to install or remove.

bisn oil tools

Oil & Gas Well Plugging with Wel-lok M2M™

The Wel-lok M2M™ technology is an industry-leading high expansion bridge plug solution designed by BiSN to address the shortcomings of conventional bridge plugs and cement. It consists of three main components; the eutectic bismuth alloy plug, the thermite heater and the running tool, and can run on wireline or slickline.

The Wel-lok M2M™ provides a faster, superior and more cost-effective well plugging solution than other plugs on the market. It uses a bismuth-based alloy that is melted in situ creating a permanent, gas-tight, V0-rated metal-to-metal seal, allowing even damaged casings to be sealed.

bridge plugs

BiSN well plugging technology advantages:

Seals wells with patented metal to metal technology

Heater uses a thermite chemical reaction that is non-explosive, no special licenses or handling permits required

Can be deployed on any standard wireline without special connection

Bismuth has a viscosity similar to water when melted in the liquid state allowing it to flow into the smallest of areas including cement micro-annuli

Bismuth has a density 10 times that of water allowing the alloy to displace wellbore fluids

Bismuth expands on solidification which creates a V0 gas tight seal in accordance with ISO 14310

Bismuth is non-corrosive, environmentally friendly and is not affected by H2S, CO2 or acid washes

The seal is created within minutes and ready to test within one hour

Tool range from BiSN

You can view or download a PDF data sheet of all our other tools by clicking the links below.