Constant force downhole anchor tool
AssigneeHalliburton Energy Services, Inc.
InventorsNikhil M. Kartha, Mark S. Holly
Life of this patent
Estimating the term…
Abstract
A downhole tool anchor is disclosed. In one implementation, a downhole anchor tool may include a housing, an axial drive in the housing, a rack connected to the axial drive, a pinion in the housing, the pinion having teeth that engage teeth on the rack, a gear tube within the pinion, the gear tube having internal threads, a slip rod having external threads that engage the internal threads within the gear tube, and a radial bearing coupled to the gear tube, the radial bearing having a slip rod alignment member that prevents the slip rod from free spinning in the gear tube.
Claims20
A downhole tool anchor comprising:
- a housing;
- an axial drive in the housing;
- a rack connected to the axial drive;
- a pinion in the housing, the pinion having teeth that engage teeth on the rack;
- a gear tube connected to the pinion, the gear tube having internal threads;
- and
- a slip rod having external threads that engage the internal threads within the gear tube and having a wellbore engagement surface at an end of the slip rod;
- a bearing coupled to the gear tube;
- and
- a slip rod alignment member that prevents the slip rod from free spinning in the gear tube.
A method for anchoring a downhole tool in a wellbore, the method comprising:
- positioning a downhole anchor at a location in the wellbore, the anchor including a housing, an axial drive in the housing, a rack connected to the axial drive, a pinion in the housing, the pinion having teeth that engage teeth on the rack, a gear tube connected to the pinion, the gear tube having internal threads, a slip rod having external threads that engage the internal threads within the gear tube and having a wellbore engagement surface at an end of the slip rod, a bearing coupled to the gear tube, and a slip rod alignment member that prevents the slip rod from free spinning in the gear tube;
- moving the axial drive in an axial direction within the housing, causing the pinion to rotate;
- extending the slip rod radially outward from the housing until an end of the slip rod engages an inner surface of the wellbore casing.
A system for anchoring tools in wellbore, the system comprising:
- a downhole tool having a housing, an axial drive in the housing, a rack connected to the axial drive that is connected to a pinion;
- wherein the pinion is coupled to a gear tube having internal threads that mate with external threads on a slip rod having a wellbore engagement surface at an end, the gear tube being coupled to a bearing, the downhole tool also having a slip rod alignment member that prevents the slip rod from free spinning in the gear tube.
Dependencies are inferred from the claim text.