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When the hydraulic pressure is removed from the well, small grains of hydraulic fracturing proppants (either sand or aluminium oxide) hold the fractures open. Hydraulic fracturing began as an experiment in 1947, and the first commercially successful application followed in 1950.
Fracking is a new method for extracting natural gas from shale rocks. Wells are drilled down to these and then heavy mud injected to hydraulically fracture the shale rocks. Thâ¦e fractures release the gas trapped in the rocks which is then extracted at thew well head.