Field Trial in South Texas February 2018

Well Abandonment with Wel-lok™ STC

Statistics

Location:
Texas
Environment:
Onshore
Deviation:
Depth:
4400'
Downhole Pressure:
2050psi
Differential Pressure:
1500psi
Temperature:
71ºC
Setting ID:
8.835"
Restriction:
8.679"
Sealing ID:
14.000"

Identification of problem

Provide a pressure seal through production casing, sealing against open-hole formation.

Issues to overcome

When casing is run and cemented in the well a competent seal is not always created between the cement and the open-hole formation. When abandoning a well, it is important to ensure all annuli are properly sealed.

Application

The production casing was perforated and existing cement was washed out. A Wel-lok™ STC was set inside the casing and through the perforations to provide across the wellbore out to the open-hole formation.

Outcomes/Conclusion

The tool was successfully set and provided a seal against the open-hole formation, proving Wel-lok™ technology could be utilized for annular isolation in open-hole applications.

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.

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.

Get in touch and find a
permanent solution for your well

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