Have done a narrated Power Point entitled “How Gas Wells Leak”. It’s the video twin of the eponymous paper “How Gas Wells Leak” which covers the same gaseous ground in considerably more detail, and refers to papers written by the industry and scientists, who surprisingly all come to pretty much the same conclusion : If you want to introduce gas into groundwater, drill a horizontal gas well through a bunch of layers of shallow gas deposits. Then wait.
Gas wells leak from the outside up, then from the inside out. Translation: 94% of new wells do not leak from the casing (the production string). (Pa. completion show a DOA rate of about 6.5%). Most old wells do not leak from the casing – for awhile. What leaks is the well bore itself – the hole in the ground. That is incompletely plugged by the cement (not concrete/ not structural, just a plaster plug) First from outside the outermost casing (production/ intermediate/ surface), between the outer layer of cement and the well bore. As then as the casing (production tubing) rusts, it begins to leak.
How carefully you drill the well does not keep it from leaking – eventually. Whether you frack it with water or propane does not matter a bit. Well bores leak. Sooner or later, all of them.
You can do this even upside down, in Australia. Or you can do it up in Canada, in the frozen tundra. They even leak in French. Deep in the Heart of Texas. But evidently, for some strange reason understood only to gas company lawyers, frackademics and fracking shills, not anywhere near a Cabot or a Chesapeake well in Pennsylvania. That would be fracking impossible, wouldn’t it ? Or near Range Resource wells in Texas.