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Paddy
| Diamond Glossary (алмазы и бриллианты - глоссарий терминологии) |
A borehole drill bit having cutters that expand on pressure. also called expansion bit, paddy bit.
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Pickard core barrel, английский
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.
Oversize hole, английский
- A borehole the diameter of which is excessive because of the whipping action or eccentric rotation of the drill string and bit.
- Ствол скважины, имеющий диаметр больше номиналь ного диаметра режущего бурового инструмента р
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