Patent ID: 7686103
Filing Date: 2010-03-30
Classification: E21B,E21D,Y10T

Abstract:
1. A method of creating a helical groove in a bore hole formed in a strata comprising: a. providing a drill bit having: 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.