Patent ID: 6622803
Filing Date: 2003-09-23
Classification: E21B

Abstract:
A stabilizer for use in a drill string for drilling a bore hole, comprising:a) a stabilizer body adapted to be mounted in said drill string; b) a first stabilizer blade affixed to said stabilizer body, said first stabilizer blade having a distal end adapted to engage said bore hole; c) a sleeve rotatably mounted on said stabilizer body; d) at least a pair of circumferentially displaced second stabilizer blades projecting radially outward from said sleeve, said pair of second stabilizer blades rotating in a common circumferentially extending plane axially displaced from said first stabilizer blade; and e) a locking mechanism for locking said sleeve in first and second circumferential orientations, wherein when said sleeve is in said first circumferential orientation, the midpoint between said pair of second blades is substantially axially aligned with said first stabilizer blade.