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Pickard core barrel
| Diamond Glossary (алмазы и бриллианты - глоссарий терминологии) |
A double-tube core barrel in x-group sizes. the distinguishing feature of the pickard barrel is that when blocked the inner barrel slides upward into the head, closing the water ports and stopping the flow of the circulating liquid, and no additional drilling can be done without irreparably damaging the bit until the barrel is pulled and the blocked inner tube cleared.
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Circulating, английский
Additional, английский
- Дополнительный 33
- Дополнительный; добавочный
Distinguish, английский
Отличать; различать; различаться
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Pilot reaming bit, английский
A box-threaded, diamond-set, annular-shaped bit designed to be coupled to a pilot and used to ream a borehole to a specific casing size. see pilot 1 for description of the pilot to which the reaming bit is attached.
Paddy, английский
A borehole drill bit having cutters that expand on pressure. also called expansion bit, paddy bit.
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