E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 10/26 (2006.01) E21B 10/32 (2006.01) E21B 17/10 (2006.01)
Patent
CA 2289367
A tool for expanding a hole size while drilling tool is disclosed. The tool utilizes a mechanically actuated mandrel and extendable cutting lugs designed in a configuration with fewer moving parts than previous designs. The cutting lugs have multiple cutting elements attached. The cutting lugs are driven between two cylindrical diameter surfaces to achieve a large differential between the retracted and extended positions of the tool, and to provide sufficient stability to allow the tool to be used in the extended position while drilling forward. The lugs are internally assembled and tapered to closely match the slots in the body of the tool for additional stability and to prevent complete passage through the tool for prevention of catastrophic failure. The tool has a locking mechanism to allow the tool to remain in the extended position when the weight is removed from the tool. In an alternate embodiment, the cutting lugs may be replaced with stabilizing lugs having a wear resistant surface or mounted with wear resistance elements to form an expanding drill string stabilizer.
Gowling Lafleur Henderson Llp
Sheshtawy Adel
LandOfFree
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