Well Intervention Solutions

Issues encountered at
the Intervention Stage

A common issue that effects the economic viability of a well during production is a high percentage water generation due to a watered out zone. This is particularly difficult to fix when the completion uses a sand screen and/or open hole gravel packs (OHGP), as the annulus beyond the screen needs to be sealed for the solution to be successful. Although there are other solutions on the market that are used to reduce the water cut, they require perforating or punching holes in the screens to gain access to the annulus. Therefore the BiSN’s Wel-lok M2M™ WSO solution provides an annular seal without damaging the completion in any way.


BiSN has developed a tool utilizing their patented Wel-lok M2M™ technology to address sealing off watered out zones. This tool is known as the Wel-lok M2M WSO™ (Water Shut Off) and creates a seal in the production string and the annulus without damaging the completion. This ensures the unwanted produced water does not enter the production string, increasing oil production rates and reducing the amount of waste water that must be disposed.

Summary Overview of the Wel-lok M2M™ technology

BiSN Wel-lok M2M™ technology consists of utilizing a modified thermite heater to melt a bismuth based alloy that cools and expands on solidification. Some of the advantages of this technology are:

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 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

Application of the Wel-lok M2M™ technology for Well Intervention

With the innovative foundation of the Wel-lok M2M™ core technology, the engineers at BiSN have further developed a unique application solution for well interventions. Using the testing facilities at our Houston site and then working alongside some of the major oil corporates, in offshore environments across the globe, we have invented an effective water shut off solution, which reduces water cut and increases oil production, even in wells that previously produced 100% water.


Utilizing our patented BiSN core technology, the Wel-lok M2M™ WSO has been specifically developed as a water shut off tool for sand screen and open hole gravel pack completions (OHGP).


Unlike any other solution on the market, the Wel-lok M2M™ WSO (Water Shut Off) tool seals the annulus and the wellbore in one operation without the need to perforate or punch the sandscreen. The melted alloy fills the annulus leaving a significant reduction in water flow.


BiSN tool range

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