When oil and gas production began in the 19th century in North America, standards and regulations for the drilling and plugging of wells had not yet been developed. Over time, many of these and other wells were abandoned - unplugged, or not plugged to modern standards, and have sat idle for an extended, possibly unknown, period of time. These wells might not have been originally operated and maintained in accordance with existing statutes and regulations and, due to degradation over time and potential improper prior operations, they can emit methane, contaminate groundwater, and impact ecosystems, creating risks for both the environment and the public.



To explore and share the variety of existing procedures and standards for plugging orphaned and abandoned wells, including current best practices for well-plugging technologies, the National Academies of Sciences, Engineering, and Medicine convened a workshop on July 18-19, 2024. Sponsored by the Department of the Interior's Orphaned Wells Program Office, the workshop included members of the federal government, state leaders, tribal representatives, industry experts, and other affected parties. This proceedings summarizes the presentation and discussion of the workshop.

Table of Contents


Front Matter
1 Introduction
2 Orphaned and Abandoned Well-Plugging: Costs, Challenges, and Benefits
3 Examples of Well-Plugging Prioritization Considerations: Evaluating Wellbore Integrity and Subsurface Conditions
4 Examples of Procedures and Best Practices for Wellbores
5 Environmental Risks and Monitoring
6 Remediation, Reclamation, and Restoration
7 Advances in Plugging and Abandonment for Idled Wells
8 Examples of Key Workshop Themes
References
Appendix A: Workshop Statement of Task
Appendix B: Workshop Agenda
Appendix C: Workshop Planning Committee Member Biographies