.~.~ With controllable passage between central conduit and space above packer or plug
DEFINITION
Classification: 166/131
(under subclass 118) Devices wherein there is a fluid passage between a central conduit which supports the packer or plug from the top of the well while it is being run into the well and the annular space above the packer or plug, between the central conduit and the surrounding conduit, the passage being controllable by a valve, closure or changeable restriction.
SEE OR SEARCH THIS CLASS, SUBCLASS:
123+, for devices as defined in this subclass wherein the passage is opened by detaching the central conduit.
127, for a device comprising a central chamber expanding anchors, spaced packers and a controllable passage between the chamber and the space above a lower packer outside of the chamber.
129+, for devices as defined in this subclass in which the passage between the central conduit and the space above the packer passes through the packer but outside the central conduit.
