E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 10/42 (2006.01) E21B 17/10 (2006.01)
Patent
CA 2687544
A rotary drill bit having blades with gage pads disposed on exterior portions thereof to improve steerability of the rotary drill bit during formation of a directional wellbore without sacrifice of lateral stability. One or more of the gage pads may include radially tapered exterior portions and/or cut out portions to assist with reducing wear of the associated gage pad. For some applications, a rotary drill bit may be formed having blades with gage pads having a relatively uniform exterior surface. Hard facing material and/or buttons may be disposed on exterior portions of the gage pad to form a radially tapered portion to improve steerability, reduce wear of the gage pad and/or improve ability of the rotary drill to form a wellbore having a generally uniform inside diameter, particularly during directional drilling of the wellbore.
L'invention concerne un trépan rotatif ayant des pales avec des tampons de calibre disposés sur des portions extérieures pour améliorer la capacité de direction du trépan rotatif pendant la formation d'un sondage directionnel sans sacrifier la stabilité latérale. Un ou plusieurs des tampons de calibre peuvent comprendre des portions extérieures radialement effilées et/ou des portions découpées pour contribuer à réduire l'usure du tampon de calibre associé. Pour certaines applications, un trépan rotatif peut être formé avec des pales ayant des tampons de calibre de surface extérieure relativement uniformes. Un matériau de surfaçage dur et/ou des boutons peuvent être disposés sur des portions extérieures du tampon de calibre pour former une portion radialement effilée afin d'améliorer la capacité de direction, réduire l'usure du calibre et/ou améliorer la capacité du trépan rotatif à former un sondage ayant un diamètre intérieur généralement uniforme, en particulier pendant un forage directionnel du sondage.
Ashlie Riun
Chen Shilin
Gowling Lafleur Henderson Llp
Halliburton Energy Services Inc.
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