E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 10/60 (2006.01) E21B 7/18 (2006.01) E21B 7/24 (2006.01) E21B 21/00 (2006.01)
Patent
CA 2069953
A drilling bit having an irrigation system which uses an irrigating fluid. The bit comprises a hollow drill head (14) housing at least one fluidic oscillator (23, 23') which includes an accelerator nozzle (26, 26') supplied by said fluid and opening into a cavity (46, 46') in which a dividing element (34, 34') is mounted which is provided with a ridge (36, 36') located slightly downstream from the nozzle. Said dividing element defines in said cavity two passages (42, 44, 42', 44') towards which the fluid is alternately directed in pulsed jets. Said passages are linked respectively to two series of channels (16 to 22) which open onto the outer surface of the head (14) through a plurality of outlet openings (21) which are oriented so that the pulsed jets they give out are directed to selected portions of the head that need to be cleaned, cooled or lubricated.
2069953 9108371 PCTABS00105 L'invention concerne un outil de forage à système d'irrigation au moyen d'un fluide d'irrigation. L'outil comprend une tête de forage creuse (14) dans laquelle est logée au moins un oscillateur fluidique (23; 23') comportant une tuyère d'accélération (26; 26') alimentée par ledit fluide et qui débouche dans une cavité (46; 46') dans laquelle est montée un élément diviseur (34; 34') pourvu d'une arête (36; 36') située lègèrement en aval de la tuyère, ledit élément diviseur définissant dans ladite cavité deux passages (42, 44; 42', 44') vers lesquels le fluide est dirigé alternativement en jets pulsés, lesdits passages communiquant respectivement avec deux séries de canaux (16 à 22) débouchant sur la surface extérieure de la tête (14) par une pluralité d'orifices de sortie (21) orientés avec des inclinaisons telles que les jets pulsés de fluide qu'ils émettent soient dirigés vers les parties choisies de la tête à nettoyer, à refroidir ou à lubrifier.
Besson Alain
Robic
Total Compagnie Francaise Des Petroles
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