Plug & Abandon (P&A)
Cementing and sealing a depleted or non-viable well to retire it safely — an operator obligation that, if neglected, can leave an orphaned well for the state to plug.
Plug and abandon (P&A) is the work of permanently sealing a well that is depleted or no longer economic. Crews set cement plugs across the producing zones and at the surface, cut off the casing, and restore the site so fluids cannot migrate between formations or reach groundwater. It is the end-of-life counterpart to drilling and completion.
P&A is the legal responsibility of the operator who holds the well. Regulators set the standards and timelines — in Texas the Railroad Commission, with the agency and rules varying by state. When an operator goes bankrupt or walks away, the well becomes an "orphaned" or inactive well, and the state may have to plug it using bond money or a dedicated fund.
For a mineral or surface owner, an unplugged well can stall a new lease, complicate a sale, and raise liability questions. Confirming that old wells on a tract are properly plugged is a normal part of title and site diligence.