(a) Saddlery a kind of bit with a rotating ball or bead fitted on the mouthpiece; (b) Mechanics a drilling bit in which the cutting teeth are on…
| 单词 | θ213365 |
| 释义 | society > occupation and work > equipment > oil and natural gas recovery equipment > [noun] > drilling equipment > drilling bits (6) roller bit1858 (a) Saddlery a kind of bit with a rotating ball or bead fitted on the mouthpiece; (b) Mechanics a drilling bit in which the cutting teeth are on… rock bit1875 a bit (bit, n.1 6) used for drilling hard formations. spudding bit1907 a drilling bit used in spudding. underreamer1912 A drilling bit that can be used to drill a hole below the casing, of sufficient size for the casing to be lowered further. oil string1921 the innermost casing (tubing) in an oil well, extending down to the oil-producing rock. spudder1922 A small drilling rig used for spudding. |
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