Apparatus and method for cementing a liner in a well bore
This patent describes an apparatus for cementing a liner string in a well bore. The apparatus consists of: a liner string insertible in a well bore; an operating string of smaller diameter than the internal diameter of the liner string and insertible therein; means connecting the operating string within the internal diameter of the liner string operable by rotation of the operation string to release the operating string form the liner; a plug carrying body connected to the lowermost extent of the operating string; a top plug having an interior; a first pressure releasable collet latch securing the top plug to the plug carrying body whereby the top plug is releasably supported from the plug carrying body; a longitudinally space bottom plug having an interior; a second pressure releasable collet latch securing the bottom plug to the top plug, whereby the bottom plug is releasably supported from the top plug; a longitudinally shiftable top sleeve located within the interior of the top plug for locking the top plug to the plug carrying body until the second pressure-releasable collet latch securing the bottom plus is released; a longitudinally shiftable bottom sleeve located below the longitudinally shiftable top sleeve for initially locking the bottom plug to the top plug; wherein the plug carrying body is provided with an internal recess and wherein the top plug is provided with a plurality of upwardly extending collet fingers, each of the collet finger terminating in a lug, the collet lugs being received within the internal recess when the top plug is secured to the plug carrying body.
- Assignee:
- Baker Hughes Inc., Houston, TX
- Patent Number(s):
- US 4842069
- OSTI ID:
- 5629235
- Country of Publication:
- United States
- Language:
- English
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