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P&A Application in Norway North Sea

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Identification of problem

This well required a gas tight seal in both the 5 ½” production tubing and tubing x 9 5/8” production casing annulus.

Issues to overcome

Traditional methods of circulating cement balance plugs does not generate a gas tight seal. In order to continue with the abandonment of the well, the operator needed to ensure the well was free of pressure and gas.

Application

The production tubing was perforated and a wel-lok™ STC was set in the well to provide a gas tight seal in the tubing and casing.

Outcomes/Conclusion

The tool was successfully set and provided isolation in the 5 ½” x 9 5/8” annulus, further proving wel-lok™ technology could be utilized for annular isolation in multiple sized completions.

About the application

The wel-lok™ STC (Seal Through Casing) has been developed to achieve a gas tight V0 seal well annuli that cannot be achieved by traditional cement balance plugs. Run on electric line, this tool does not need surface pumping equipment to circulate the alloy in place. Due to its viscosity and density, once melted the liquid alloy will flow with gravity into the annulus. When it cools below its melting point it solidifies, expands and creates a gas tight seal across the entire wellbore. The entire process, from melting to solidification, takes place in minutes and the seal is ready to test within an hour.

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Seal Through Casing - BiSN
Seal Through Casing - BiSN
Seal Through Casing - BiSN
Seal Through Casing - BiSN

How it works…

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

How it works…

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