How to Reduce Costs and Maintain Safety During Well Abandonment

Well abandonment is an important part of an oil or gas well’s lifecycle, but it can also be a significant expense. Operators need to permanently isolate the well while managing labour, equipment, and intervention costs—without compromising the integrity of the final barrier.

Cost efficiency doesn’t have to mean cutting corners. Below, we’ll discuss how careful planning and the right wireline tools from Avalon Research can reduce costs and maintain wellbore safety.

Why Can Well Abandonment Become Expensive?

Abandonment costs extend beyond the price of an individual downhole tool. Operators may need specialized crews and equipment for multiple interventions, along with the time required to prepare the well, establish barriers, verify isolation, and successfully complete the abandonment.

This means one of the most effective ways to control costs is to look at the complete operation. Reducing unnecessary trips downhole, choosing efficient deployment methods, and avoiding equipment that introduces unnecessary complexity can all contribute to a more efficient abandonment program.

Choosing the Right Wireline Tools for Well Isolation

Bridge plugs are commonly used to establish mechanical barriers during well abandonment, suspension, and isolation operations.

The appropriate bridge plug depends on the well conditions and geometry. Important factors include:

Casing or tubing I.D.
Restrictions within the wellbore
Setting depth
Required differential pressure
Operating temperature
Well fluids and chemical environment
Material compatibility
Required setting method
Whether the isolation is temporary or permanent

Avalon Research’s Permanent Bridge Plugs are available in multiple sizes and configurations, with pressure ratings up to 15,000 psi and temperature options up to 620°F / 327°C depending on the selected configuration. Avalon’s Permanent Bridge Plugs are supplied standard with materials compliant with NACE MR0175 / ISO 15156 requirements for sour-service applications.

Available elastomer options include HNBR/HSN (Highly Saturated Nitrile), FKM (Viton®), FEPM (AFLAS®), and FFKM (Kalrez®), allowing the sealing system to be selected according to the required temperature and chemical-service conditions.

Selecting a plug according to the actual downhole conditions helps ensure that efforts to reduce operational cost do not come at the expense of the required barrier performance.

Consider Your Deployment Method

The method used to deploy a bridge plug can also affect the resources required for the operation. Avalon’s permanent bridge plugs provide multiple setting options, including slickline, e-line, coiled tubing, and non-explosive systems.

Having multiple options allows operators to select a deployment method that suits the well and equipment already available to their team.

For sites where explosives pose logistical or operational challenges, Avalon’s Non-Explosive Setting System (NESS) offers a great alternative to deploying compatible wireline tools without conventional pyrotechnics.

Match the Plug to the Abandonment Plan

Permanent equipment is not automatically the right choice for every isolation job. If a well is being suspended rather than permanently abandoned, a retrievable bridge plug is a more practical and cost-effective choice. While you can use a conventional bridge plug for temporary isolation, they are very expensive and time-consuming to drill out.

Avalon’s QUP Retrievable Bridge Plug can be set and pulled using slickline, e-line, or coiled tubing and rebuilt in the field with minimal tools. This makes it suitable for temporary isolation where operators intend to reopen the well.

For long-term abandonment, our permanent bridge plugs are specifically designed for long-term isolation and are available for demanding pressure, temperature, and chemical environments.

Reduce Well Abandonment Costs with Avalon Research

Minimizing abandonment costs is not simply about finding the least expensive wireline tools. It means considering the entire operation: the well conditions, barrier requirements, deployment method, equipment availability, and work required to complete the job.

With proper planning and quality isolation equipment from Avalon Research, wellsites can identify opportunities to control labour and intervention costs while maintaining the reliable barriers required for responsible well abandonment.