Oil well pipe joint
AssigneeSumitomo Metal Industries, Ltd.
InventorsKunihiro Fukui, Minoru Nishihara, Toshiro Mase, Yoshiyasu Morita, Hisakazu Kawashima
Life of this patent
Estimating the term…
Abstract
An oil well pipe joint comprising a metal-to-metal sealing portion without thread is disclosed. A metal-plated or resin-coated layer exhibiting improved resistance to galling is provided on the outer peripheral surface of a thread-free lip portion which constitutes part of the metal-to-metal sealing portion on an externally-threaded member. At the metal sealing portion, satisfactory sealing properties are maintained under severe corrosive conditions, enabling the joint to be connected and disconnected over 10 times, and usually over 25 times.
Claims10
An oil well pipe joint having a metal-to-metal sealing portion, which comprises:
- an externally-threaded pipe member including at the outer end a lip portion having a peripheral surface free from threads;
- and
- an internally-threaded pipe member including at the inner end an inner surface which corresponds to said peripheral surface and which is free from threads;
- characterized in that a galling resistant layer exhibiting improved resistance to galling is provided only on said externally-threaded pipe member and at least on the threadfree lip portion thereof.
Dependencies are inferred from the claim text.