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the set up.jpg

Abandonment of the GSC#1 Well in Athabasca, Alberta

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When a long-forgotten, inaccessible leaky gas well was discovered in the Town of Athabasca, RPS applied out of the box thinking to access the well in an attempt to ensure that the well was abandoned to modern standards. Instead of building an access road down a steep riverbank or an ice road on the Athabasca River, we reached the well from above, using a crane and coiled tubing rig. Securing permits and approvals in record time, RPS plugged the well with cement, stopped the gas leak, and met the spring thaw deadline imposed by the landowner and regulators for equipment removal. The unique and pragmatic approach used by RPS to solve this complex problem reduced the project cost by 50% compared to previous estimates, was safer and better for the environment since neither the river nor the riverbank was disturbed.
A win, win, and win!

The well in 1984
the wellhead

Challenges to stopping the leak

The well itself

There were many questions about the well. What condition was it in? Was the casing corroded, collapsed or even present in the well? What work had been done between 1895 and 2018 but not recorded?

The GSC report from 1895 suggested that there was 4 5/8” casing left in the well, but this information had not been verified. Not to mention, of course, that safely working while gas is leaking is a concern.

The well is located within the Town of Athabasca, directly adjacent to a major highway, beside an active business and residential area. It sits on a low riverbank only 3 metres away from the Athabasca River, a designated Canadian Heritage River that flows through several communities and provincial parks downstream of the wellsite. Perhaps most challenging was the lack of vehicle access from the upper bank. The 40-degree slope made direct access to the well impossible without significant expense and environmental impact.

A tight timeframe

The leaking gas posed a very small, but potential safety risk for the Town of Athabasca. We were engaged on January 20, 2021, and planning began in earnest on January 25 with the first site visit. The fieldwork needed to be completed by the end of the fiscal year, on March 31. Due to spring thaw in Alberta, when heavy equipment on roads is prohibited, the deadline moved to March 15 to remove equipment in time.

Prior to RPS’ engagement, the option being considered to access the well was to build a 650-metre ice road on the Athabasca River during the winter and bring the heavy equipment to the site via the river. A temporary barrier, known as a cofferdam, would also need to be built to create a dry and solid area for the equipment over the well. This approach would likely double the project’s cost and delay the project by at least one year as it was already too late in the season to begin building the road.

equipment used for the Abandonment of the GSC#1 Well in Athabasca

Addressing the risks and securing approvals

Before beginning any work on the well, RPS needed to secure the relevant permits from municipal, provincial and national regulatory bodies.

A formal land access agreement was signed by the landowner where the crane and rig would sit. As the well sat within the flood plain of the Athabasca River, we needed to secure the required approval under the Alberta Water Act. Finally, we provided adequate assessment and notification to meet First Nations Consultation requirements.

Protecting the fish and wildlife during these types of projects is paramount. Approvals were obtained from the Department of Fisheries and Oceans (DFO), Athabasca Fish and Wildlife, and the Alberta Fisheries Department. These departments were satisfied with the mitigation measures designed by our team to protect the river and riverbank while the work was taking place.

The process of securing each of these approvals from regulators and stakeholders can routinely take several months, and equipment can’t be moved until all the approvals are granted. However, the RPS concentrated their efforts and worked closely with all regulatory bodies to ensure that the proposed operation was in compliance with all standards, resulting in a quicker than normal approval process to meet the deadline

Mobilization of equipment and crews began on February 22, 2021, and the work was completed on March 5, 2021.

A view of the abandonment of the GSC#1 well

A successful project

This imaginative plan to use a crane and coiled tubing rig was a success.

Despite the challenging well location, multiple unknowns, and safety concerns, we successfully stopped the gas from leaking. Along the way, we discovered an obstruction in the wellbore near-surface and the absence of casing below approximately 65 metres. As a result of our experienced team and diligent pre-planning, we effectively overcame these challenges and permanently abandoned the well with the placement of a cement plug.

Using the crane to access the well from the top of the river valley kept project costs low, avoided a major disturbance to the riverbank, removed the need for a treacherous ice road on a flowing body of water, and allowed for on-time delivery, ten days earlier than the imposed deadline.

At the end of the project, the well was tested, and no gas was detected. The wellhead will be left in place over the next few seasons for monitoring purposes, and then it will be cut off below the surface, the casing will be capped, and the site will be reclaimed.

All stakeholders, including the Town of Athabasca, are grateful to finally have the well successfully abandoned with minimal disturbance to the river and riverbank.