| 摘要 |
<p>In the preferred embodiment, this invention provides a threaded pipe coupling (12) for connection with a conventional threaded pipe end (10) so as to effect improved sealing against internal fluid pressure and against external fluid pressure as may be required in an oil or gas well. The coupling form causes the thread contact pressure to be greater at a maximum (16) and minimum (18) thread contact diameters than exists at intermediate points (18) along the length of thread contact. An auxiliary plastic seal (27) that will undergo-thermal cycling is also provided.</p> |
