Drill bit air clearing system

Details Drill bit air clearing system Drill bit air clearing system

E - Fixed Constructions

21

B

252/73, 255/78

E21B 10/00 (2006.01) E21B 10/18 (2006.01) E21B 10/22 (2006.01)

Patent

CA 1081686

ABSTRACT OF THE DISCLOSURE An earth boring drill employing roller cutters is provided with a peripheral seal surrounding the bearing shaft and engaging a peripheral surface of the open end of the cutter to prevent entry of solids to and retain lubricant in the bearing. The drill bit is provided with one or more passageways arranged for pressurization with air provided through the drill string and having an opening into the space between the leg of the drill bit and the adjacent rotating surface of the cutter. The size of the passageway is preferably related to the size of the peripheral clearance between the cutter and the leg of the drill bit, such that a positive pressure of air is maintained in said peripheral space to blow out detritus which would tend to erode the seal.

322926

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