I've been waiting for this to start, particularly in the areas of our country with deep mines such as West Virginia, Ohio and Pennsylvania. With the ongoing problems of poorly made or defective vertical well casings and the aquifer contamination issues, you can only imagine what could happen when a well casing that is under extremely high pressure and stress, particularly when a well that is being fracked, develops leaks in a worked coal seam....
Karlis Muehlenbachs, a geochemist at the University of Alberta, has stated that "The biggest problem is that half or more the wells drilled leak due to improper cement jobs or industry is not following best practices,"
"They'll frack each well up to 20 times. Each time the pressure will shudder and bang the pipes in the wellbore. The cement is hard and the steel is soft. If you do it all the time you are going to break bonds and cause leaks. It's a real major issue. "
Coal Mining Clashing With Gas Drilling