| 摘要 |
<p>A threaded connection (10) for tubular members comprising a box connector (12,14) having axially spaced threaded sections (20,22) and a thread-free section (24) therebetween, the threaded sections of the box connector defining a two-step thread, a pin connector (16,18) having axially spaced threaded sections (26,28) and a thread-free section therebetween, the threads in the box connector mating with the threads on the pin connector, there being at least one annular relief (34,36) in the thread-free portion of at least one of the pin connector and the box connector, an axially facing pin torque shoulder (32) being formed on the box connector, a metal-to-metal seal (24,30) being formed between the thread- free sections of the pin and box connectors when the pin torque shoulder and the box torque shoulder are engaged, the annular relief being adjacent the metal-to-metal seal.</p> |
