Patent ID: 7686103

Claim:
A method of creating a helical groove in a bore hole formed in a strata comprising: a. providing a drill bit having: i. an elongate bit body having a forward end and a rearward end, ii. a first stationary cutter located at the forward end and having a cutting edge that defines a periphery; iii. a first rotatable cutter having a cutting edge that in a first position does not extend beyond the periphery and in a second position extends beyond the periphery; b. rotating the bit in a first rotation direction such that the first rotatable cutter is in the first position and moving the bit in a first axial direction into the strata to create the bore hole having a nominal diameter and an axial length; and, c. subsequently rotating the bit in a second rotation direction opposite the first rotation direction such that the first rotatable cutter is in the second position and moving the bit in a second axial direction opposite the first axial direction to create the helical groove within at least a portion of the axial length of the bore hole wherein the helical groove has a groove depth that extends radially beyond the nominal diameter.