Apparatus for blocking communication between well bore intervals
The patent describes an apparatus adapted to be moved into the upwardly-opening axial bore of a central member of a packer anchored in a well bore for selectively closing communication between formation intervals above and below the packer and comprising: a tubular body adapted to be telescopically disposed within an internally-threaded upper bore portion and a smooth-wall lower bore portion in the central packer member; seal means on the body for sealingly engaging the smooth-wall bore to block communication therethrough around the body; a mandrel telescopically arranged within the body and adapted for longitudinal movement between upper and lower positions; bypass means cooperatively arranged for closing communication through the body in one position of the mandrel and for opening the communication in the other position and the mandrel; latching means including a plurality of flexible collet fingers dependently secured around the body having externally-threaded enlarged heads cooperatively arranged for threadedly engaging the internally-threaded bore portion to anchor the body within the central packer member; and retaining means including a retaining member cooperatively mounted on the mandrel and movable against the collet fingers in response to upward movement of the mandrel for threadedly engaging the enlarged heads within the internally-threaded bore portion.
- Assignee:
- Arlington Automatics, Inc., Grand Prarie, TX
- Patent Number(s):
- US 4638860
- OSTI ID:
- 6904290
- Country of Publication:
- United States
- Language:
- English
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