| 摘要 |
Proper alignment of threads when joints of casing are made up in hostile environments, such as on off-shore floating platforms subject to being buffeted by wave action, is provided by means of an improved box and pin connector. The pin has a substantially tapered threaded section whose small diameter end terminates in a lower guide section and whose large diameter is adjacent a larger diameter upper guide section. The box has a complementary section of internal oppositely tapered threads to mate with those on the pin as well as a smaller lower receptacle to receive the lower guide section on the pin and a larger receptacle to receive the upper guide section on the pin. The upper and lower guide sections on the pin and complementary receptacles in the box guide the threads into proper alignment. The threads are sufficiently tapered so that the guide sections and complementary receptacles are mutually, partially engaged prior to engagement of the threads. The threads have a back slant that prevents expansion of the box.
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