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Reverse feed
| Diamond Glossary (алмазы и бриллианты - глоссарий терминологии) |
To move bit and drill stem backwards away from borehole bottom while drill stem is rotated.
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Rack back, английский
To move the drilling machine away from the borehole collar by sliding it on its base, using the rack-and-gear pinion to facilitate moving the machine. see rack 1.
Blank off, английский
To line a specific portion of a borehole with casing or pipe for the purpose of supporting the side-walls or to prevent ingress of unwanted liquids or gas. also called case, case off, seal off.
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