DRILL BIT WITH SELF-ADJUSTING GAGE PADS

摘要

A drill bit and a method of drilling a wellbore utilizing the drill bit is disclosed, including: providing a drill bit including a bit body and at least one movable member associated with a lateral extent of the bit body; conveying a drill string into a formation, the drill string having the drill bit at the end thereof; drilling the wellbore using the drill string; selectively extending the at least one moveable member from the lateral extent of the bit body at a first rate; and selectively retracting the at least one moveable member to a retracted position at a second rate that is less than the first rate.

主权项

1. A drill bit, comprising:
a bit body; a self-adjusting pad associated with the bit body; a rate control device coupled to the pad that extends from a bit surface at a first rate to reduce vibration and retracts from an extended position to a retracted position at a second rate in response to external force applied onto the pad to decrease friction and increase maneuverability, the rate control device including: a piston for applying a force on the pad; a biasing member that applies a force on the piston to extend the pad at the first rate; a fluid chamber associated with the piston; and a pressure management device for controlling a fluid pressure within the fluid chamber.