Threaded joint for oil well pipes
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United States of America Patent
Stats
-
Nov 3, 1998
Grant Date -
N/A
app pub date -
Nov 21, 1995
filing date -
Nov 22, 1994
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A threaded joint for an oil well pipe having (1) a tapered threaded having roughly the shape of a buttress thread, (2) a pin having a male thread and a box having a female thread, (3) a seal and a torque shoulder, characterized in that (i) the load flank angle of the threads is -20.degree. or greater and less than 0.degree., the stab flank angle is greater than 30.degree. and at most 60.degree. (ii) there is a positive amount of interference between the male threads and the female threads, and (iii) during and at the completion of make-up, the load flanks and the stab flanks are contacting each other, and there is a gap between the crests and the roots.
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