Hydraulic fracturing, or fracking hidráulica1 stimulation (also known by the English term fracking) is a technique to enable or enhance the extraction of gas and oil from underground. The procedure involves drilling a vertical well in which, once reached the desired depth, pressure inject some material in the soil with the aim of expanding existing fractures in the bedrock that contains the gas or oil and are typically less than 1 mm, thus favoring its exit to the outside. Usually the injected material is water with sand and chemicals, which seeks to promote cracking or even the dissolution of the rock.