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Jack and circle
| Diamond Glossary (алмазы и бриллианты - глоссарий терминологии) |
The apparatus consisting of a power¬ful jack and a steel-toothed circle on which the jack moves. the circle is attached to the drill floor, centered on the borehole collar, and used to tighten or loosen the joints in a string of drill tools.
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Buoyant weight, английский
The apparent weight of a string of drill tools suspended in a liquid-filled borehole. the apparent weight is the weight of the drill string in air less the weight of the liquid displaced by the drill string when suspended in a liquid-filled borehole.
Rose-bit dropper, английский
The annular-shaped ring at the top of the deflection wedge, the outside diameter of which is the same as the diameter of the borehole in which it is installed, by means of which the wedge is attached to a rose bit and drill-rod string when lowered into position in the borehole.
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