| 摘要 |
A coupled version of a threaded connection (10) includes first threads (16, 38) and second threads, (20, 34) on both elongate tubulars (14, 30) and a coupling (45). An integral joint version (50) preferably includes a first and second tapered threads (58, 60) on each of the connected tubular bodies (54, 56). The coupling preferably includes a dope entrapment cavity in one of the connected tubulars between the first and second threads. A tapered metal seal surface is provided preferably between the first and second threads. The second thread in a preferred embodiment is a hook thread with a negative rake angle. In another embodiment, the pin ends of a coupled connection may engage, with seals provided between the first and second threads on each tubular.
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