Drill bit and method for reducing formation fluid invasion...

Details Drill bit and method for reducing formation fluid invasion... Drill bit and method for reducing formation fluid invasion...

E - Fixed Constructions

21

B

E21B 10/00 (2006.01) E21B 7/00 (2006.01) E21B 10/42 (2006.01) E21B 10/46 (2006.01) E21B 10/60 (2006.01)

Patent

CA 2073995

DRILL BIT AND METHOD FOR REDUCING FORMATION FLUID INVASION AND FOR IMPROVED DRILLING IN IMPERMEABLE FORMATIONS ABSTRACT OF THE DISCLOSURE A drill bit and method in which polycrystalline diamond cutters mounted on a bit crown cut formation chips akin to the manner in which a grater cuts cheese. Chips in impermeable or plastic formations are extruded by the cutters into cavities internal to the bit via slots adjacent each cutter. Drilling fluidcirculates internally of the bit from the drill string and into the annulus above that portion of the bit bearing cutters. In one embodiment, the portion of the bit body upon which the crown is formed is made of an elastomer which is pressurized intosealing engagement with the bottom of the borehole thereby further sealing freshly cut formation from drilling fluid.

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