Drill bit having enhanced cutting structure and stabilizing...

B - Operations – Transporting – 21 – K

Patent

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B21K 5/04 (2006.01) B23P 15/32 (2006.01) E21B 10/42 (2006.01) E21B 10/54 (2006.01) E21B 10/56 (2006.01)

Patent

CA 2155392

A fixed cutter drill bit includes sets of cutter elements mounted on the bit face, each set including at least two cutters that are mounted at generally the same radial position with respect to the bit axis. The cutter elements of a set are positioned on different blades of the bit and are mounted having their cutting faces are out-of-profile, such that certain elements in the set are exposed to the formation material to a greater extent than other cutter elements in the same set, or mounted with differing degrees of backrake, or both. The cutter elements in a set may have equal diameters or may vary in size and shape. The bit exhibits increased stability or vibration resistance, and drills initially as a "light-set" bit and later as a "heavy set" bit.

Outil de forage fixe comprenant des groupes d'éléments de coupe installés sur la surface de l'outil. Chaque groupe possède au moins deux éléments de coupe qui sont généralement installés à la même position radiale par rapport à l'axe de l'outil. Les éléments de coupe d'un groupe sont placés sur différentes lames de l'outil et ils sont installés de façon à ce que leurs surfaces de coupe soient en position hors profil, de sorte que certains éléments du groupe sont plus exposés aux matériaux de la formation que d'autres éléments du même groupe, ou ils sont installés avec divers degrés d'inclinaison arrière, ou bien les deux. Les éléments de coupe d'un groupe peuvent être de diamètres égaux ou être de dimension ou de forme variées. L'outil démontre une stabilité ou une résistance aux vibrations plus grandes et fore initialement comme un outil légèrement serti, et, plus tard, comme un outil très serti.

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