System, method and cutterhead for dry full-area drilling

Details System, method and cutterhead for dry full-area drilling System, method and cutterhead for dry full-area drilling

E - Fixed Constructions

21

B

E21B 21/00 (2006.01) E21B 10/28 (2006.01) E21B 10/60 (2006.01) E21B 17/10 (2006.01) E21B 21/16 (2006.01) E21D 9/10 (2006.01) E21D 9/13 (2006.01)

Patent

CA 2182605

In a method for use in dry, rotary, crushing full-area drilling, use is made of suction air alone for removing cuttings produced during drillings. To carry out the method, two suction nozzles (13) are arranged on the underside of a cutterhead (1), These nozzles together have a substantially diametrical extent and the length of a radius on the cutterhead and are provided with suction intakes (14A) in the vicinity of the periphery of the cutterhead. The suction intakes (14A) are connectible a common suction channel (11) in the drill string (6) of the cutterhead. The suction channel (11) has substantially constant diameter.

Un procédé de forage rotatif à sec par broyage sur surface pleine consiste à utiliser exclusivement de l'air d'aspiration pour éliminer des déchets de forage. Pour appliquer ce procédé, on dispose deux ajutages d'aspiration (13) sur la face intérieure d'une tête de coupe (1). Ces ajutages présentent conjointement une portée diamétrale et séparément une longueur correspondant au rayon de la tête, et ils sont dotés d'entrées d'aspiration (14A), situées près de la périphérie de cette tête de coupe, pouvant être raccordées à une conduite d'aspiration commune (11) intégrée au train de tiges (6) de la tête. Cette conduite d'aspiration (11) représente un diamètre pratiquement constant.

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