Sub-surface release plug assembly with primary and secondary release mechanisms
AssigneeHalliburton Company
InventorsDavid F. Laurel, Steven N. Rolen
Life of this patent
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Abstract
A sub-surface release plug assembly for use in cementing an outer casing annulus around a well casing comprising a top plug releasably connected to a drill string by a collet mechanism and a bottom plug releasably attached to the top plug by a sleeve assembly extending through the top plug. The assembly further comprises primary and secondary release means for releasing said plugs thereby ensuring that the plugs are released in said casing during cementing operations.
Claims18
A subsurface release apparatus for use in a well casing, said apparatus comprising:
- an upper plug means for releasably connecting to a drill string by a first releasing mechanism;
- a lower plug means for releasably attaching to said upper plug means;
- and
- said first releasing mechanism comprising a first release means actuatable at a first predetermined pressure in said drill string and a second release means actuatable a second predetermined pressure in said drill string.
A subsurface release apparatus for use in a well casing, said apparatus comprising:
- an upper plug means for releasably connecting to a drill string by a first releasing mechanism;
- a lower plug means for releasably attaching said upper plug means by a second releasing mechanism;
- and
- each of said first and second releasing mechanisms comprising a primary releasing means and a secondary releasing means.
Dependencies are inferred from the claim text.