Dictionary:Fig D-27
FIG. D-27. Drill-collar usage. A heavy drill collar puts weight on the bit without bending the drill pipe. Increasing the weight on the drill bit by pushing on the drill stem might cause it to bend, resulting in a crooked hole.
FIG. D-27. Drill-collar usage. A heavy drill collar puts weight on the bit without bending the drill pipe. Increasing the weight on the drill bit by pushing on the drill stem might cause it to bend, resulting in a crooked hole.
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