| 主权项 |
1. An apparatus for controlling vibrations of a drill string and applying a force to a drill bit, the apparatus comprising:
a body having an uphole end and a downhole end, wherein the body comprises a first piston positioned at the uphole end and a second piston positioned at the downhole end; a first biasing member operatively associated with the first piston, wherein the first biasing member urges the first piston outward from the body to provide a first force in an uphole direction to the drill string engaged with the uphole end; a second biasing member operatively associated with the second piston, wherein the second biasing member urges the second piston outward from the body to provide a second force in a downhole direction to the drill bit engaged with the downhole end; and an outer housing and an inner member within the housing, wherein a first end of the inner member engages the first biasing member and a second end of the inner member engages the second biasing member, wherein compression of the first biasing member enables the first piston to move within the outer housing and external to the inner member, and wherein compression of the second biasing member enables the second piston to move within the outer housing and external to the inner member, wherein a vibration from the drill string compresses the first biasing member such that the first force resists the vibration and maintains the body and the drill bit in a generally consistent orientation relative to the drill string, and wherein an uphole force from the drill string, the drill bit, or combinations thereof, compresses the second biasing member such that the second force prevents movement of the drill bit in an uphole direction. |
