Drilling bits for plastic formations

Details Drilling bits for plastic formations Drilling bits for plastic formations

E - Fixed Constructions

21

B

255/74

E21B 10/00 (2006.01) E21B 10/16 (2006.01) E21B 10/54 (2006.01)

Patent

CA 1105447

ABSTRACT OF THE INVENTION Drilling bits are disclosed which are particularly efficient drilling devices when used in soft plastic under- ground formations which normally are difficult or impossible to drill with conventional drilling bits. The bits of this invention are characterized by having relief openings formed in the individual cutting elements to provide extrusion of the soft formation face into removable chips.

340433

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