Drill bit having adjustable total flow area

Details Drill bit having adjustable total flow area Drill bit having adjustable total flow area

E - Fixed Constructions

21

B

E21B 10/18 (2006.01) E21B 10/38 (2006.01) E21B 10/60 (2006.01) E21B 21/10 (2006.01)

Patent

CA 2392937

A drill bit is disclosed which includes a bit body having a plurality of ports therein arranged to provide a flow path between an interior of a drill string and the exterior of the bit body. At least one flow relief is disposed in one of the ports. The at least one flow relief is adapted to provide an increase in total flow area of the bit upon application to the bit of a selected fluid flow condition. A method for is also disclosed changing a total flow area of a drill bit, which includes pumping drilling fluid through the drill bit and operating a flow relief disposed in the bit to change the total flow area of the bit.

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