| 摘要 |
A tubular upset extension apparatus which prolongs the usefulness of upsetted tubing joints used in drilling oil, gas and water well bore holes. The upset extension apparatus is fitted onto hollow bore tubing having shortened and specially threaded box and pin joints and a beveled peripheral shoulder at the inner terminal of the threads. The upset extension apparatus likewise has a hollow bore and specially threaded male and female ends which are rotatably engagable with the shortened tubing upsets. An exterior, non-bore penetrating circumferential groove is defined by the point of intersection of the shoulders of the upset extension and the shortened tubing upset. The circumferential groove receives a cosmetic weld, non-thread and non-bore penetrating weld which rigidly secures the upset extension to the shortened upset and maintains the internal and external integrity of the engaged sections.
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