Tool joint rebuilding
Abstract
Abstract THE OUTER PERIPHERY OF A WORN DOWN TOOL JOINT ON THE END OF A DRILL PIPE IS RESTORES TO DESIRED DIAMETER BY APPLYING A WELD BEAD TO THE OUTER PERIPHERY OF THE TOOL JOINT, THE JOINT BEING ROTATED AND THE WELD ROD PERIODICALLY, I.E. ONCE EACH REVOLUTION, TRANSLATED, THE WIDTH OF ONE WELD BEAK, PARALLEL TO THE JOINT AXIS, DURING APPLICATION OF THE WELD METAL. COOLING OF THE JOINT DURING WELDING IS EFFECTED BY PLUGGING THE PIPE INTERIOR ADJACENT THE TOOL JOINT AND ADMITTING WATER TO THE PIPE ADJACENT THE PLUG, THE WATER FLOWING BACK THROUGH THE TOOL JOINT AND OUT THE END OF THE PIPE. AN OPEN AIR TANK RECEIVES THE HOT WATER FROM THE PIPE. THE WATER COOLS IN THE TANK AND IS RECIRCULATED BY A PUMP BACK INTO THE PIPE ADJACENT THE PLUG. THE PLUG IS AN EXPANDABLE BLADDER CARRIED ON THE END OF A COMPRESSED AIR PIPE BY MEANS OF WHICH THE BLADDER IS INSERTED THROUGH THE INTERNAL UPSET OF THE PIPE AND EXPANDED.
Inventors
- 👤 William R Garrett
Bibliographic Details
Claims Analysis
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-10-11 | 1975-04-12 | 1975-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-11 | 1979-04-12 | 1979-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-11 | 1983-04-12 | 1983-10-12 | $7700.00 | Window Closed / Lapsed |