A gripper assembly for anchoring a tool within a downhole passage and for possibly assisting movement of the tool within the passage. The gripper assembly includes an elongated mandrel and flexible toes that can be radially displaced to grip onto the surface of the passage. The toes are displaced by
A gripper assembly for anchoring a tool within a downhole passage and for possibly assisting movement of the tool within the passage. The gripper assembly includes an elongated mandrel and flexible toes that can be radially displaced to grip onto the surface of the passage. The toes are displaced by the interaction of a driver slidable on the mandrel and a driver interaction element on the toes. In one embodiment, the toes are displaced by the interaction of rollers and ramps that are longitudinally movable with respect to one another. In another embodiment, the toes are displaced by the interaction of toggles that rotate with respect to the toes.
대표청구항▼
What is claimed is: 1. A tool for use within a passage, the tool comprising: an elongated body; and a gripper assembly for anchoring the tool within the passage, the gripper assembly having an expanded position and a retracted position, the gripper assembly in the expanded position being configured
What is claimed is: 1. A tool for use within a passage, the tool comprising: an elongated body; and a gripper assembly for anchoring the tool within the passage, the gripper assembly having an expanded position and a retracted position, the gripper assembly in the expanded position being configured to contact an inner surface of the passage, the gripper assembly comprising: an elongated beam oriented generally parallel to the body, the beam having ends rotatably engaged with elements of the gripper assembly; a driver longitudinally movable with respect to the beam; and a driver interaction element positioned radially inward of the beam; wherein longitudinal movement of the driver with respect to the beam and the driver interaction element causes the driver to interact with the driver interaction element substantially without sliding friction therebetween, said interaction varying a radial position of a portion of the beam. 2. The tool of claim 1, wherein the driver interaction element is substantially longitudinally fixed with respect to the beam. 3. The tool of claim 1, wherein longitudinal movement of the driver with respect to the driver interaction element causes a radially outward force to be applied to an inner surface of the beam. 4. The tool of claim 1, wherein the driver interaction element includes a ramp, the driver including a roller configured to roll against the ramp when the driver moves longitudinally with respect to the ramp, wherein the radial position of the beam portion varies as the roller rolls against the ramp. 5. The tool of claim 1, wherein the driver interaction element includes a first ramp portion and a second ramp portion, the driver including a first roller and a second roller, the rollers configured roll against the ramp portions when the driver moves longitudinally with respect to the ramp portions, wherein the radial position of the beam portion varies as the rollers roll against the ramp portions. 6. The tool of claim 1, wherein the driver includes a ramp, the driver interaction element including a roller configured to roll against the ramp, wherein the roller and the beam portion move radially as the roller rolls against the ramp. 7. The tool of claim 1, wherein the driver interaction element comprises a toggle having a first end rotatably engaged with the driver and a second end rotatably engaged with respect to the beam in a manner such that the second end and the beam portion have substantially the same radial position, wherein longitudinal movement of the driver with respect to the beam varies an angle between a longitudinal axis of the body and an orientation of the toggle, wherein a radial displacement of the beam portion with respect to the longitudinal axis increases as said angle increases. 8. The tool of claim 7, wherein the second end of the toggle is pivotably secured directly to the beam. 9. The tool of claim 7, wherein the beam includes a toggle recess that receives the second end of the toggle in a manner that allows the second end to rotate within the recess. 10. The tool of claim 1, wherein the gripper assembly further comprises a piston longitudinally movable with respect to the beam and longitudinally fixed with respect to the driver, the piston configured to be moved longitudinally by exposing the piston to fluid. 11. The tool of claim 10, wherein the gripper assembly further comprises a spring biasing the piston away from the driver interaction element. 12. The tool of claim 1, wherein radial positions of the ends of the beam are substantially fixed. 13. A tool for use within a passage, the tool comprising: an elongated body; and a gripper assembly for anchoring the tool within the passage, the gripper assembly having an expanded position and a retracted position, the gripper assembly in the expanded position being configured to contact an inner surface of the passage, the gripper assembly comprising: an elongated beam oriented generally parallel to the body, the beam having ends rotatably engaged with elements of the gripper assembly; a driver longitudinally movable with respect to the beam, the driver including a first roller; and a first ramp portion positioned radially inward of the beam, wherein longitudinal movement of the driver with respect to the beam and the first ramp portion causes the first roller to roll against the first ramp portion; wherein a radial position of a portion of the beam varies as the first roller rolls against the first ramp portion. 14. The tool of claim 13, wherein the driver further includes a second roller, the gripper assembly further comprising a second ramp portion positioned radially inward of the beam, wherein longitudinal movement of the driver with respect to the beam and the ramp portions causes the first and second rollers to roll against the first and second ramp portions. 15. A tool for use within a passage, the tool comprising: an elongated body; and a gripper assembly for anchoring the tool within the passage, the gripper assembly having an expanded position and a retracted position, the gripper assembly in the expanded position being configured to contact an inner surface of the passage, the gripper assembly comprising: an elongated beam oriented generally parallel to the body, the beam having ends rotatably engaged with elements of the gripper assembly; a ramp longitudinally movable with respect to the beam; and a roller positioned radially inward of the beam, wherein longitudinal movement of the ramp with respect to the beam causes the roller to roll against the ramp; wherein the roller and a portion of the beam move radially as the roller rolls against the ramp. 16. A tool for use within a passage, the tool comprising: an elongated body; and a gripper assembly for anchoring the tool within the passage, the gripper assembly having an expanded position and a retracted position, the gripper assembly in the expanded position being configured to contact an inner surface of the passage, the gripper assembly comprising: an elongated beam oriented generally parallel to the body, the beam having ends rotatably engaged with elements of the gripper assembly; a driver longitudinally movable with fespect to the beam; and a toggle positioned radially inward of the beam, the toggle having a first end rotatably engaged with the driver and a second end rotatably engaged with respect to the beam such that radial positions of the second end and a portion of the beam are substantially the same, wherein longitudinal movement of the driver with respect to the beam varies an angle between a longitudinal axis of the body and an orientation of the toggle; wherein a radial displacement of the beam portion with respect to the longitudinal axis increases as said angle increases. 17. The tool of claim 16, wherein the second end of the toggle is pivotably secured directly to the beam. 18. The tool of claim 16, wherein the beam includes a toggle recess that receives the second end of the toggle in a manner that allows the second end to rotate within the recess.
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