I read on a few posts here on FR that they frack conventional well also, have to have Thackney to chime in on that.
Fracking also helps old conventional wells to get more % out of it that would other wise be left in the ground.
Fracking has been employed on conventional wells since the late forties.
The only thing that's new about today's fracking is that it is employed in tandem with hortizontal drilling -- which is now also being tried on older conventional wells.
As you might expect, fracking equipment and formulae for fracking fluids have also undergone about 70 years of technological advances in the interim. But the concept is the same -- fracture the formation and release the fluids (and/or gasses).