Drag bits with dropping tendencies and methods for making...

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 10/43 (2006.01) B23B 51/00 (2006.01) E21B 10/42 (2006.01)

Patent

CA 2605196

A bit having improved dropping tendencies includes a first plurality of cutters in an active region and a second plurality of cutters in a passive region. The second plurality of cutters has unique radial positions with respect to the first plurality of cutters. The first and the second pluralities of cutters also have cutting tips that extend to the primary cutting profile of the bit. A third plurality of cutters is located in the passive region with cutting tips positioned recessed from the primary cutting profile. A forth plurality of cutters is positioned as back up cutters in the active region and includes cutters positioned in radial locations such that they overlap, when viewed in rotated profile, with cutters in the third plurality of cutters. The fourth plurality of cutters has cutting tips positioned to extend to the primary cutting profile. The cutters on the bit are arranged such that an imbalance force vector exists on the bit when used to drill though earth formation.

Trépan offrant des propriétés de chute libre supérieures comportant un premier ensemble de couteaux dans une zone active et un deuxième ensemble de couteaux dans une zone passive. Les couteaux du deuxième ensemble ont des positions radiales uniques par rapport à ceux du premier ensemble. Le premier et le deuxième ensemble de couteaux comportent aussi des têtes de coupe qui s'étendent jusqu'au profil de coupe principal du trépan. Un troisième ensemble de couteaux, situé dans la zone passive, comporte des têtes de coupe positionnées en retrait par rapport au profil de coupe principal. Un quatrième ensemble de couteaux qui constitue un ensemble de rechange est situé dans la zone active et comprend des couteaux placés dans des positions radiales de manière à ce qu'ils chevauchent, lorsqu'on regarde dans le sens de la rotation, les couteaux du troisième ensemble. Les couteaux du quatrième ensemble comportent des têtes de coupe qui s'étendent jusqu'au profil de coupe principal. Les couteaux du trépan sont disposés de manière à ce que le trépan présente un vecteur de force de déséquilibre lorsqu'il est utilisé pour forer une formation terrestre.

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