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Field Trial in South Texas February 2018

Stage of Well : WELL ABANDONMENT

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 M2M 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 M2M™ technology could be utilized for annular isolation in open-hole applications.

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P&A Application in Norway North Sea February 2018

Stage of Well : WELL ABANDONMENT

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 M2M 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 M2M™ technology could be utilized for annular isolation in multiple sized completions.

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P&A Application in Norway North Sea April 2017

Stage of Well : WELL ABANDONMENT

Identification of problem:

Two separate wells had previously been abandoned by setting bridge plugs and dump bailing cement inside a liner to isolate the producing zone. The wells continued to build gas pressure at surface through the production tubing up to 1,200 psi.

Issues to overcome:

Traditional methods of setting bridge plugs and spotting cement on top does not generate a gas tight seal. In order to continue with the abandonment of the well, the operator needed to ensure the producing zone was properly isolated and there was not pressure in the production tubing string.

Application

Wel-lok M2M TS™ tools were set inside the liner of each well.

Outcomes/Conclusion:

An initial pressure test of 4,000 psi was performed, followed by a successful 24-hour negative pressure test which resulted in no bubbles or gas pressure at surface. Further, each of these wells underwent a 1-year monitoring period prior to resuming the well abandonment, resulting in no bubbles or gas pressure build up over this period.

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P&A Application in Norway North Sea April 2017

Stage of Well : WELL ABANDONMENT

Identification of problem:

This well had previously been abandoned by circulating a cement balance plug through perforations in 4 ½” tubing into a 7” production casing. The well continued to build gas pressure at surface through the production tubing and casing.

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 in order to cut and pull the production tubing.

Application

The production tubing was perforated and a Wel-lok M2M STC™ was set in the well to provide a gas tight seal in the tubing and casing.

Outcomes/Conclusion:

An initial pressure test of 4,000 psi was performed, followed by a successful negative pressure test which resulted in no bubbles or gas pressure at surface. Further, this well underwent a 1-year monitoring period prior to resuming the well abandonment, resulting in no bubbles or gas pressure build up over this period.

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BiSN Alaska Case Study
BiSN Case Study Alaska

Field Trial Alaska

Stage of Well : WELL ABANDONMENT

Identification of problem:

Provide a gas tight seal as a long term solution during well abandonment, reducing corporate liability and potential environmental impact, utilizing the Wel-lok M2M™ technology. This concept of using this technology had previously been proven in a laboratory environment but had yet to be field tested in an actual well.

Issues to overcome:

Conventional elastomer based bridge plugs and cement have been used for this purpose but neither provide a true, long term seal that is non-corrosive, gas tight and/or compatible with all downhole fluids and gasses.

Application

15 Wel-lok M2M™ TS seals were run in multiple wells all set inside 4.5” tubing.

3 different wellbore temperatures

3 different well deviations

Outcomes/Conclusion:

Tools were deployed, set and pressure tested successfully. The Wel-lok M2M™ technology was proven to be successful beyond a laboratory environment.