Cutters for downhole cutting devices

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 10/567 (2006.01)

Patent

CA 2657454

Improved cutter design as well as an improved design for downhole cutters, such as mandrel cutters and rotary cutter mills. A cutter is described with a rectangular, rounded "lozenge" shape. The cutter presents a cross-sectional cutting area having a pair of curvilinear end sections (23) and an elongated central section (24). Preferably, the overall length of the cutter is 1.5 times the width. The cutter may also include a raised cutter edge (18) for chip breaking during cutting.

La présente invention se rapporte à une conception de haveuse améliorée ainsi qu'à une conception améliorée pour les haveuses de fond de trou, tels que les haveuses de pic à deux pointes et les broyeurs à lames. Une haveuse est décrite comme ayant une forme rectangulaire de <= losange >= arrondi. La haveuse présente une zonede havage transversale ayant une paire de sections d'extrémité curvilignes et une section centrale allongée. De préférence, la longueur totale de la haveuse est égale à 1,5 fois la largeur. La haveuse peut également inclure une arête de haveuse surélevée pour le broyage de copeaux au cours du havage.

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