Drill bit and other downhole tools

Details Drill bit and other downhole tools Drill bit and other downhole tools

E - Fixed Constructions

21

B

E21B 10/00 (2006.01) E21B 10/46 (2006.01) E21B 12/00 (2006.01) E21B 17/00 (2006.01) E21B 17/10 (2006.01) E21B 41/00 (2006.01)

Patent

CA 2161874

Various steel, downhole tools and components of drill string, including as examples, a PDC drill bit (10), a rotary rock bit (100), a cross-over sub (40), a stabilizer (51), a reamer or hole enlarger (70), and coring bit (120), are selectively treated to cause certain of their parts to be electro-negative with respect to steel, and certain other parts to either have the same electro-negativity as steel, or to be treated electro-positive with respect to steel.

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