Expandable bit

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 10/32 (2006.01) E21B 10/62 (2006.01) E21B 37/00 (2006.01)

Patent

CA 2405970

An expandable drill bit for use with earth drilling equipment. The bit includes arms held in a closed position, so that the bit may be inserted through casing or a small bore hole. The arms are expandable to create an expanded drill bit having a crown profile common to a solid crown bit. The arrangement of the arms provides a short gauge length so that the expanded bit is steerable downhole. Embodiments of the expandable drill bit are detailed to show mechanisms for actuating the arms between the open and closed positions.

Trépan extensible utilisé avec du matériel de forage du sol, comprenant des bras maintenus en position fermée, de façon que le trépan puisse être inséré à travers un tubage ou un trou de forage de faible diamètre. Les bras sont extensibles de manière à fournir un trépan extensible d'un profil de couronne habituel pour un trépan massif. L'agencement des bras permet d'obtenir une courte longueur standard, de sorte que le trépan, une fois expansé, peut être dirigé en puits. Des formes d'exécution du trépan extensible sont spécifiées afin d'illustrer les mécanismes d'actionnement des bras entre les positions ouverte et fermée.

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