Wellhead system
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United States of America Patent
Stats
-
Feb 2, 1988
Grant Date -
N/A
app pub date -
Jul 31, 1986
filing date -
Jul 31, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A pack-off assembly for a wellhead system including a tapered pack-off mounted on a pack-off nut (22) which has multi-start threads (40) for engaging similar mating multi-start threads (26) on a casing hanger (C). The casing hanger (C) is provided with a taper (20) which faces the surrounding cylindrical wall (16) of the wellhead (W) thus providing a tapered annulus (14). The pack-off, being tapered, is moved into the tapered annulus (14) by rotation of the pack-off nut (22) where the pack-off engages an abutment (30) and is compressed and expanded into sealing engagement with the internal (16) and external surfaces (20) on the wellhead (W) and casing hanger (C). In one embodiment, the multi-start threads (40, 26) on the running nut (22) and casing hanger (C) are tapered buttress threads and, in a second embodiment, the multi-start threads (40a, 26a) on the running nut 22 and casing hanger (C) are cylindrical square threads. This pack-off assembly is characterized as having better sealing capabilities, misalignment accommodation, minimum travel of the pack-off during setting, and ease of retrieval.
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