| 摘要 |
A Helical Bearing anchor catcher for the insertion into a well conduit to anchor well equipment in both linear directions and rotation in one direction. The device has a helical groove in either the mandrel or the drag body to accommodate the helical bearing. The helical bearing has holes within it to accommodate shear pins. The shear pins translate the linear motion from the helical bearing to the drag body. The drag body has a conical surface which contacts slips to drive them outward and grip the inner well conduit wall. Once the slip grips the inner well conduit wall the mandrel and the attached well equipment can not move linearly in either direction or rotate any further in the setting direction within the well conduit. The anchor catcher can be unset by rotating the mandrel in the direction opposite to the setting direction. The drag body, pins, and helical bearing all move downward away from the slip. The slip then moves away from the inner well conduit wall allowing the anchor catcher to be moved to a different location within or removed from the well conduit. A secondary unsetting method is provided by applying tension above that of the maximum shear force of the pins causing the pins to shear. The mandrel will move upwards along with the cone element away from the slips allowing the slipsto move away from the inner well conduit wall allowing the anchor to be removed from the well conduit.
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