Tool for lowering into centered position within a well bore
Patent
·
OSTI ID:6632834
This patent describes a tool which may be lowered within and raised from a centered position within a well bore beneath the lower open end of a well conduit within the well bore, comprising a wire line manipulatable body adapted to be moved vertically through the well conduit, a plurality of arms mounted on the body for movement between inner positions in which their outer ends may pass vertically through the well conduit and outer positions in which the outer ends engage the well bore in circumferentially space relation, means yieldably urging the arms toward their outer positions, means in addition to the arms for sensing the entry of the body into a bore of the well conduit near its lower end, and means for holding the arms in their inner positions, as the body is lowered within the well conduit and then when the sensing means is lowered into the bore, releasing the arms for movement by the urging means to their outer positions when the arms are below the lower end of the well conduit, the arms being forced to their inner positions when raised with the body against the lower end of the well conduit, and the holding means being returned to its arm holding position upon continued raising of the body to a position in which its sensing means moves above the bore.
- Assignee:
- AVA International Corp., Houston, TX
- Patent Number(s):
- US 4776397
- OSTI ID:
- 6632834
- Country of Publication:
- United States
- Language:
- English
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