20 the reciprocating rock drill comprises a wearing drill bit 22 wearing drill bit 22 is connected to a reciprocating piston 24 moving within piston casing 26 venturi 34 positioned between the reciprocating piston 24 and the inner pipe directs and accelerates exhaust air from the reciprocating piston 24 to the inner pipe 6 the compressed air 36 is of sufficient velocity to pick up and carry all drill cuttings 38 to the surface of the well bore through the inner pipe 6 shroud 28 is located between the piston casing 26 and the formation 30 in relatively air tight and frictional engagement with the inner wellbore wall 32 shroud 28 prevents compressed air 36 and drill cuttings from escaping up the formation annulus 40 between the outside wall 16 of the outer pipe 12 of the concentric drill string 4 and the inner wellbore wall 32 in another embodiment of the present invention compressed air can be pumped down the inner pipe 6 and the drill cuttings and exhaust compressed air carried to the surface of the well bore through concentric drill string annulus 20 reverse circulation drilling of the present invention can also use drilling mud or drilling fluids as well as air to power a rotary drill bit to cut the rock in the well bore powerful mud pumps push mud or fluids down concentric drill string annulus 20 drill cuttings drilling mud and fluids travel up the inner pipe 6 to surface of the wellbore where they are put into a mud tank or pit in the alternative drilling mud or drilling fluids can be pumped down the inner pipe 6 and the drilling mud or drilling fluids and drill cuttings travel up the concentric drill string annulus 20.