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Runback
| Diamond Glossary (алмазы и бриллианты - глоссарий терминологии) |
- To retract feed mechanism to its starting position when rechucking.
- To drill slowly downward toward the bottom of the hole when the drill string has been inadvertently or deliberately lifted off-bottom during a rechucking operation.
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Inadvertent, английский
Небрежный, неумышленный.
Deliberate, английский
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Sand blast, английский
- A stream of sand forcibly projected by air or steam for removing scale from metals or to remove enough matrix metal from the crown of a worn impregnated bit to expose new diamonds to act as new cutting points. see blast
- A mudcap in which sand is used instead of mud.
- (grit blast) the use of sand or grit at high velocity through air pressure to clean surfaces.
Run in, английский
- To lower the assembled drill rods, core barrel, and bit, or other types of pipe, casing, or drill string into a borehole.
- To drill the first few inches slowly at the beginning of a core run or when collaring a borehole.
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