Threaded joint for oil-well pipe
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United States of America Patent
Stats
-
May 16, 1989
Grant Date -
N/A
app pub date -
Feb 12, 1988
filing date -
Feb 23, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A threaded joint for oil-well pipe comprises a box having an internal thread, a pin having an external thread, a metal-to-metal sealing contact provided at the unthreaded tips of the box and pin, and a film of grease applied on the surface of the internal and external threads. The cross-sectional area of a void containing the screw axis left between the meshed internal and external threads is at least 0.6 mm.sup.2 per pitch.
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