Control device for drilling a bore hole

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 17/10 (2006.01) E21B 4/18 (2006.01) E21B 7/06 (2006.01)

Patent

CA 2179893

The invention relates to A rock drill guide tool. A sleeve arrangement (8) is placed around a tubular drill tube (9) which rotates during a drilling operation and through which drilling liquid is supplied under pressure during drilling intervals. The sleeve arrangement includes a plurality of support units (15, 16) which can be projected out into contact with the wall of a drill hole and which are placed circularly in the sleeve arrangement. The support units are intended to he moved out into engagement with the wall of a drill hole during drilling intervals, so as to prevent the sleeve arrangement from rotating during a drilling operation. The support units (15, 16) are adapted to be held against the drill hole with a frictional force which is sufficiently low to enable it to become overcome in an axial direction by downward pressure of the drill tube during a drilling operation and sufficiently high to latch the sleeve against rotation by the drill tube as the drill tube rotates. The support units (15, 16) are placed in at least two ring sections of the sleeve arrangement and are provided with elements (19; 20) which project out against the wall of a drill hole. These elements engage the rock so as to cut grooves into the wall of a drill hole as the drill is moved down during a drilling operation. The outwardly projecting elements of all shoulder ring sections are placed mutually sequentially in an axial direction along straight lines, so that the outwardly projecting elements that are located behind the foremost elements in each line of elements as seen in the drilling direction will move in grooves cut in the rock by the foremost elements as the drill moves downwards.

L'invention concerne un outil de guidage de marteau pneumatique. On place un fourreau (8) autour d'un tube de forage (9) rotatif pendant une opération de forage et dans lequel le liquide est envoyé sous pression pendant les intervalles de forage. Ce fourreau renferme une pluralité de supports (15, 16) disposés en cercle pouvant être sortis et venir en contact avec la paroi d'un puits. Ces supports sont conçus pour être sortis et venir en contact avec la paroi d'un puits pendant les intervalles de forage de manière à empêcher le fourreau de tourner pendant une opération de forage. Ces supports (15, 16) sont également conçus pour être maintenus contre le puits par une force de friction suffisamment faible pour qu'ils soient entraînés dans un sens axial par la pression descendante du tube de forage pendant une opération de forage, et suffisamment élevée pour empêcher le fourreau de tourner sous l'effet du tube de forage lorsque ce dernier tourne. Les supports (15, 16) sont placés dans au moins deux colliers du fourreau et sont dotés d'éléments (19, 20) saillants et venant contre la paroi d'un puits. Ces éléments viennent contre la roche de manière à former des rainures dans la paroi du puits à mesure que le marteau descend pendant l'opération de forage. Ces éléments saillants vers l'extérieur de toutes les sections d'épaulement circulaires sont placés séquentiellement dans le sens axial, le long de droites, de sorte que ceux qui sont placés derrière les éléments les plus en avant dans chaque ligne d'éléments conformément selon le sens de forage se déplacent dans les rainures formées dans la roche par les premiers éléments à mesure que le marteau descend.

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