Plug 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. It comprises an operating string of smaller diameter than the internal diameter of the liner string and insertable therein; means connecting the operating string within the internal diameter of the liner string operable by rotation of the operating string to release the operating string from the liner; a plug carrying body connected to the lower most extent of the operating string; a top plug releasably supported from the plug carrying body and a longitudinally spaced bottom plug releasably supported from the top plug; pressure-releasable means securing the top plug to the plug carrying body, the bottom plug to the top plug, and retainer means on the bottom plug, respectively; shiftable means for locking the top plug to the plug carrying body until the pressure-releasable means securing the bottom plug are released; and means for hydraulically balancing the pressure-releasable means securing the retainer means on the bottom plug.
- Assignee:
- Baker Hughes Inc., Houston, TX (United States)
- Patent Number(s):
- A; US 5052488
- Application Number:
- PPN: US 7-472769
- OSTI ID:
- 5797804
- Country of Publication:
- United States
- Language:
- English
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