Another piece of scientific evidence has been published that suggests that the negative press over hydraulic fracturing may be unwarranted. As most of you are aware, there have been many accusations reported in the media that fracing allowed methane to enter and contaminate water wells. While methane is not particularly toxic, it is smelly, explosive and thus potentially dangerous. A new study that you can read here was published last fall in the Proceedings of the National Academy of Sciences. That study concluded that contaminated groundwater in Texas and Pennsylvania is not due to fracing but is primarily the result of problems with pipes and seals at natural gas wells, and particularly with annulus cement, production casing, and failure of the water wells themselves.
The study authors chose research areas in the Marcellus Shale and the Barnett Shale where the most complaints of water contamination were reported. The study addressed two questions: (i) are elevated levels of hydrocarbon gases in drinking-water aquifers near gas wells natural or anthropogenic (i.e., resulting from the influence of human beings); and (ii) if fugitive gas contamination exists, what mechanisms cause it? The study was conducted by analyzing chemicals, like methane, in groundwater using noble gas and hydrocarbon tracers. This process allowed the researchers to determine if gas wells were contaminating the water, if so, which wells and also to determine which part of the drilling process or equipment was to blame. The proportions of elements such as methane, helium, neon, and argon in the groundwater demonstrated that these elements originated from leaky pipes and bad seals. If the contamination had come from fracing, the water would have exhibited different proportions of these elements.
Continue reading →