Drill bit and method for reducing formation fluid invasion and f

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

1991-09-16

1993-04-06

Britts, Ramon S.

Boring or penetrating the earth

Processes

Boring with specific fluid

175393, 175399, E21B 2100

Patent

active

051995115

ABSTRACT:
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 fluid circulates 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 into sealing engagement with the bottom of the borehole thereby further sealing freshly cut formation from drilling fluid.

REFERENCES:
patent: 4253533 (1981-03-01), Baker
patent: 4342368 (1982-08-01), Denman
patent: 4696354 (1987-09-01), King et al.
patent: 4776411 (1988-10-01), Jones
patent: 4780274 (1988-10-01), Barr
patent: 4792001 (1988-12-01), Zijsling
patent: 4887677 (1989-12-01), Warren et al.
patent: 4941538 (1990-07-01), King
patent: 4981183 (1991-01-01), Tibbitts
Eastman Christensen Coregard Brochure, "Low Invasion Coring System".
"New Coring System Reduces Filtrate Invasion", Gordon A. Tibbitts, M. G. Reed and M. McCarter, from "Advances in Core Evaluation, Accuracy and Precision in Reserves Estimation", May 23, 1990, Gordon & Breach Science Publishers.

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