Well cementing plug assemblies and methods

Details Well cementing plug assemblies and methods Well cementing plug assemblies and methods

1996-10-11

1998-03-03

Suchfield, George A.

Wells

Processes

Cementing, plugging or consolidating

166153, 166155, E21B 3316

Patent

active

057224919

ABSTRACT:
An improved well cementing plug assembly adapted to be connected to a string of drill pipe or a circulation tool for use in a pipe during the cementing of the pipe in a well bore is provided. The top and bottom plugs are selectively releasable by activating balls dropped into the plug assembly. Different sizes of plugs can be used utilizing the same inner tubes and other assembly parts, and the top plug slides on its inner tube when a pressure differential is exerted on it thereby insuring a seal between the top and bottom plugs when the plugs are landed on a float shoe or the like.

REFERENCES:
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patent: 3796260 (1974-03-01), Bradley
patent: 4624312 (1986-11-01), McMullin
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patent: 5020597 (1991-06-01), Braddick et al.
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patent: 5191932 (1993-03-01), Seefried et al.
patent: 5392852 (1995-02-01), Laurel et al.
patent: 5413172 (1995-05-01), Laurel
patent: 5522458 (1996-06-01), Watson

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