A sleeve arrangement

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 17/10 (2006.01)

Patent

CA 2377829

Sleeve arrangement (1) for a rock drill, comprising a sleeve (3), which is non- rotating during drilling and is arranged on an outer sleeve device (5), which belongs to the rock drill and is also non-rotating during drilling, which sleeve arrangement, at intervals during the drilling, is subjected to a drilling fluid pressure and will be held in a rotation-proof position with the aid of adjustable supporting units (7), the supporting units (7) being arranged so as to be held against a bore hole wall (9) with a friction which is low enough to be surmountable in the axial direction by means of downward pressure of a drilling tube (11) during drilling and high enough to friction- lock against possible rotation under the influence of the drilling tube (11) as this rotates. The sleeve arrangement (1) comprises at least one supporting unit (7, 7a) which is directly acted upon in the radial direction by the drilling fluid and has protruding elements (13) which can engage in a bore hole wall (9) such that the sleeve arrangement (1) is non-rotatable in the peripheral direction in relation to the bore hole wall (9), and the at least one supporting unit (7) is arranged in a corresponding recess (15) located in the sleeve (3).

L'invention concerne un ensemble (1) manchon de perforatrice de roches comprenant un manchon (3), qui ne tourne pas pendant le perforage et est monté sur un dispositif (5) à manchon extérieur intégré à la perforatrice de roches et ne tournant pas non plus pendant le perforage, l'ensemble manchon étant soumis, à intervalles déterminés pendant le perforage, à la pression d'un fluide de forage et étant maintenu dans une position de résistance à la rotation au moyen d'unités (7) de support réglables. Les unités (7) de support sont montées de manière à être maintenues contre une paroi (9) du trou de forage et elles présentent une friction assez faible pour être maîtrisée dans la direction axiale grâce à une pression vers le bas exercée par un tube (11) de forage lors du perforage, et assez élevée pour bloquer par friction une rotation éventuelle provoquée par le tube (11) de forage lorsqu'il tourne. L'ensemble (1) manchon comprend au moins une unité (7, 7a) de support directement actionnée dans la direction radiale par le fluide de forage et comportant des éléments (13) en saillie pouvant s'engager dans une paroi (9) du trou de forage de telle sorte que l'ensemble (1) manchon ne puisse pas tourner dans une direction périphérique par rapport à la paroi (9) du trou de forage, l'unité (7) de support étant disposée dans un creux (15) correspondant pratiqué dans le manchon (3).

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