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Утяжеленная бурильная труба (убт)
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Drill collar, английский
Drilling collar. a length of extra heavy wall drill rod or pipe connected to a drill string directly above the core barrel or bit, the weight of which is used to impose the major part of the load required to make the bit cut properly. a drill collar is usually of nearly the same outside diameter as the bit or core barrel on which it is used. not to be confused with guide rod.
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Разбурить, русский
Drift (внутреннего диаметра), английский
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