This can be caused by old natural gas wells near water well systems becoming abandoned and no longer monitored.

Horizontal oil or gas wells were unusual until the 1980s.

Almost every town in northern Indiana had one or more gas wells.

He had an oil business, drilling oil and gas wells in the late '60s.

Only 7% of the country's oil and gas wells are onshore.

As of 2010 there has been roughly 38,000 oil and gas wells around the surrounding area.

"Are you trying to prevent the road from being built because of those natural gas wells?"

By early 2008, there were more than 750 Woodford gas wells.

Between 1995 and 2007, the number of natural gas wells in the county increased from 156 to 1,820.

The technique has been applied to water, oil, and gas wells.