Vacuum, vacuum-pressure, or pressure reverse circulation bit

Details Vacuum, vacuum-pressure, or pressure reverse circulation bit Vacuum, vacuum-pressure, or pressure reverse circulation bit

E - Fixed Constructions

21

B

255/25, 255/73

E21B 10/00 (2006.01) E21B 10/18 (2006.01) E21B 21/12 (2006.01)

Patent

CA 1048486

VACUUM, VACUUM-PRESSURE, OR PRESSURE REVERSE CIRCULATION BIT Abstract of the Disclosure Drill cuttings are effectively removed from the bottom of a bore before they can adversely affect the operation of the bit. The bit includes a body member rotatably supporting individ- ual cutter members. A shield means projects from the body member proximate the cutter members. A first portion of the shield means has an outside diameter substantially equal to the outside diameter of the cutter means and substantially equal to the diameter of the bore and a second portion having an outside diameter substantially less than the outside diameter of the cutter members and sub- stantially less than the diameter of the bore. A first passage extending through the bit is adapted to provide communication with a vacuum source to assist in removing the drill cuttings. A second passage extending through the bit is adapted to provide communication with a gas pressure source to assist in removing the drill cuttings. 1a

243678

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