Rock drilling element, drill string and method for...

E - Fixed Constructions – 21 – B

Patent

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E21B 17/10 (2006.01)

Patent

CA 2606120

The present invention relates to a rock drilling element for percussive drilling that is designed to reduce the stress usually developed on a thread joint (5) when the shock wave transmits from a slender portion to a thicker part. The rock drilling element has an elongated body comprising a first portion (10A) and a second portion (10B). The first portion (10A) has a female (16) or male thread intended to be connected to a drill rod (1) or a drill tube. The first portion (10A) has an outer diameter (D1) approximately equal to the major diameter of said thread (16). The second portion (10B) has a male (15) or female thread intended to be connected to a drill bit or a guide tube. The second portion (10B) forms a guide portion for radial guiding in a hole being drilled. The length of the first portion (10A) is at least 500 mm, such that the thread joint is moved away from an unfavorable reflection area. Furthermore, the present invention relates to a drill string and a method of transferring impact energy in a drill string.

La présente invention concerne un élément pour creuser la roche destiné à des applications de forage à percussion, permettant de réduire la tension qui apparaît en général au niveau d'un raccord fileté (5) lorsque l'onde de choc passe d'une partie mince à une partie plus épaisse. L'élément pour le forage de la roche comprend un corps allongé comportant une première partie (10A) et une seconde partie (10B). La première partie (10A) comprend un filetage femelle (16) ou mâle destiné à entrer en prise avec une tige de forage (1) ou un tube de forage. La première partie (10A) possède un diamètre externe (D1) approximativement égal au diamètre le plus grand dudit filet (16). La seconde partie (10B) comprend un filet mâle (15) ou femelle destiné à entrer en prise avec une tige de forage ou un tube de forage. La seconde partie (10B) forme une partie de guidage pour le guidage radial dans un trou en cours de forage. La longueur de la première partie (10A) est d'au moins 500 mm, de façon que le raccord fileté puisse être écarté d'une zone qui ne convient pas. La présente invention concerne également un train de tiges et un procédé de transfert de l'énergie de percussion dans un train de tiges.

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