Restriction sub with deformable plastic sleeve
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United States of America Patent
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-
Jan 12, 1993
Grant Date -
N/A
app pub date -
Mar 9, 1992
filing date -
Mar 9, 1992
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In accordance with an illustrative embodiment of the present invention, a restriction sub apparatus for use during well cementing operations includes a tubular body having an internal annular recess, and a plastic restriction sleeve mounted in the recess, such sleeve having an inner diameter which is less than the inner diameter of the body so that when a drive plate on a cement displacement plug encounters the inner portion of the sleeve during downward movement, such inner portion is progressively deformed and bulged inward until the bulge dissipates into a recessed region near the bottom end of the sleeve. The resistance afforded by the plastic sleeve to downward movement of the plug provides a positive pressure surge indication at the surface that the plug is located at a particular depth in the casing.
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