Thursday, October 11, 2012
Perilous Pathways: How Abandoned Wells Can Contribute To Methane Migration Problems
October 9, 2012 | 1:00 AM
By Scott Detrow and Yan Lu
Methane is a flammable, odorless gas that exists within underground shale formations. Because of the porous, intertwined rock formations that many parts of Pennsylvania sit on top of, the gas can naturally seep to the surface. Methane can be dangerous when it migrates into water wells or basements.
Orphaned and abandoned oil and gas wells create a natural pathway for methane to migrate from. The process can be accelerated when an active well is drilled into the same formation the abandoned well is tapped into. This occurrence — called “communication” — is extremely rare, but it can create major problems at the surface. A 30-foot geyser of gas and water that burst through the ground in Tioga County in June was likely caused by Marcellus Shale drilling near an abandoned well.
This graphic shows how methane gas can make its way from deep underground into a basement, water well or the ground. Read More: http://stateimpact.npr.org/pennsylvania/2012/10/09/perilous-pathways-how-abandoned-wells-can-contribute-to-methane-migration-problems/