Patent ID: 7389831

Claim:
A method for creating a horizontal borehole using a dual member drill string, the method comprising: rotating a cutting tool using a first member of the dual member drill string, wherein the cutting tool comprises a backreaming tool; introducing a product into the borehole created by the cutting tool; clearing spoils and drilling fluids by rotating an auger using a second member of the dual member drill string, wherein the auger is disposed within the product; and pulling the backreaming tool through the borehole using the dual member drill string; wherein the first member of the dual member drill string comprises an outer member of the drill string such that the backreaming tool is rotated by the outer member by applying a force to the outer member at a first end of the drill string; and wherein the second member of the dual member drill string comprises an inner member of the drill string such that the auger is rotated by the inner member by applying a force to the inner member at a first end of the drill string.