Drilling assembly and method

Details Drilling assembly and method Drilling assembly and method

E - Fixed Constructions

21

B

E21B 17/042 (2006.01) E21B 17/16 (2006.01)

Patent

CA 2514195

The present invention provides a drilling assembly and method that is especially useful for a bottom hole drilling assembly for drilling a borehole through an earth formation. In one embodiment, the drilling assembly is preferably comprised of a tungsten alloy which is sufficiently plastic to be able to withstand the bending, torsional, and compressive stresses which occur in a bottom hole drilling assembly. The tungsten alloy weight section may be axially moveable with respect to an outer tubular and when mounted within the bottom hole assembly, acts to place the outer tubular in tension to provide a stiffer bottom hole assembly.

La présente invention concerne un ensemble et un procédé de forage convenant particulièrement à un ensemble de fond de trou pour le forage d'un trou foré au travers d'une formation géologique. Pour un mode de réalisation, l'ensemble de forage est constitué de préférence d'un alliage au tungstène suffisamment plastique pour être capable de résister aux contraintes de flexion, de torsion et de compression survenant dans un ensemble de fond de trou. Le segment-masse en alliage de tungstène peut être axialement mobile par rapport à un élément tubulaire extérieur, et quand il est monté à l'intérieur de l'ensemble de fond de trou, il a pour effet d'infliger à l'élément tubulaire extérieur une tension amenant un raidissement de l'ensemble de fond de trou.

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