Rotary drill bit with improved steerability and reduced wear

Details Rotary drill bit with improved steerability and reduced wear Rotary drill bit with improved steerability and reduced wear

E - Fixed Constructions

21

B

E21B 10/43 (2006.01)

Patent

CA 2682365

A rotary drill bit having blades with cutting elements disposed on exterior portions thereof may be formed with either a continuous cutting zone or a substantially continuous cutting zone between the last cutting element on each blade and an adjacent gage pad. Such rotary drill bits may have improved steerability during the formation of a directional wellbore and/or may experience substantially reduced wear on gage pads and/or portions of each blade adjacent to respective gage pads. For some rotary drill bits an additional cutter may be disposed in one or more gage pads adjacent to the last cutting element. For other rotary drill bits a gage cutter may be disposed between and in close proximity to both the last cutting element and adjacent portions of the associated gage pad.

L'invention concerne une pointe de forage tournante comportant des lames avec des éléments de coupe disposés sur des parties extérieures de celle-ci. La pointe de forage tournante peut être formée soit avec une zone de coupe continue soit avec une zone de coupe sensiblement continue entre le dernier élément de coupe sur chaque lame et un plot de calibrage. De telles pointes de forage tournantes peuvent présenter une maniabilité améliorée au cours de la formation d'un trou de sondage directionnel ou peuvent subir une usure sensiblement réduite sur des plots de calibrage et/ou des parties de chaque lame adjacentes aux plots de calibrage respectifs. Pour certaines pointes de forage tournantes, un outil tranchant supplémentaire peut être disposé dans un ou plusieurs plots de calibrage adjacents au dernier élément de coupe. Pour d'autres pointes de forage tournantes, un outil tranchant de calibrage peut être disposé à la fois entre le dernier élément de coupe et les parties adjacentes du plot de calibrage associé et en étroite proximité par rapport à ces derniers.

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