E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
255/73
E21B 10/00 (2006.01) E21B 10/18 (2006.01) E21B 21/12 (2006.01)
Patent
CA 1054140
VACUUM, VACUUM-PRESSURE, OR PRESSURE REVERSE CIRCULATION BIT HAVING JET-ASSISTED VACUUM 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 indi- vidual 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 substantially 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 along the length of the bit is adapted to provide communication with a gas pressure source to assist in removing the drill cuttings. The second pasaage has a portion in communication with the first passage to provide a pressurized jet-assist to the vacuum removal of the drill cuttings. -1a-
247877
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