Pack-off tool
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United States of America Patent
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-
Nov 21, 1995
Grant Date -
N/A
app pub date -
Feb 28, 1994
filing date -
Aug 31, 1991
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A pack-off tool comprises a main tubular body including an expandable sealing element located between two non-expandable ring members and being mounted on a mandrel and in sealing engagement therewith at axially spaced locations. The tubular body is axially compressible into a radially extended configuration for sealing engagement with a bore wall. A communicating bore extends through the body between the sealing locations. In use, a high pressure on one side of the tool pushes between the high pressure side of the tubular body and the bore wall, through the communicating bore and into a space between the tubular body and the mandrel, and tends to push the other, lower pressure side of the body outwardly into tighter sealing engagement with the bore wall.
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