[header] How to better understand fracking [title] Drill a well. [step] A well is drilled vertically into the ground until it reaches the permeable shale layers. [substeps] Once the digging has hit the gas rich layers, redirect it horizontally into the rock layers.
The digging is now parallel to the ground above, but at an immense depth below the surface (anywhere around 7 , 000 to 12 , 000 feet). The well is surrounded by a protective steel casing, and it is surrounded by both steel and concrete when it is drilled past the underground aquifer level.