Patent ID: 8196677

Claim:
A horizontal direction drilling system comprising a power pack coupled to a source of compressed air and a water reservoir, the power pack including (i) a controller, (ii) an air flow valve coupled to the controller and operable to control the flow of compressed air from the source of compressed air, (iii) an oiler driven by compressed air, the oiler operable to inject a predetermined quantity of lubricant into the flow of compressed air, and (iv) a pump driven by compressed air, the pump operable to inject a quantity of water from the water reservoir into the flow of compressed air such that the air, oil, and water form a mixture, wherein the controller is operable to vary the flow of compressed air through the power pack, and a steerable horizontal drill including an air powered reciprocating hammer, and a drill head, the steerable horizontal drill receiving the mixture to power the reciprocating hammer, wherein the drill head includes a drill face and the mixture exits the steerable horizontal drill through the drill face.