| 单词 | drill string |
| 释义 | > as lemmasdrill string drill string n. (a) a string wound round the shank of a drill in order to rotate it; (b) Oil Industry a column of drill pipe together with the bit and associated parts; a drilling string (cf. string n. 15b). ΘΚΠ society > occupation and work > equipment > piercing or boring tools > [noun] > drill > types of bit > parts of bit drill string1678 router bit1872 crown1873 router1874 society > occupation and work > equipment > oil and natural gas recovery equipment > [noun] > drilling equipment surface casing1877 string1895 tubular goods1922 drill pipe1932 pup joint1937 drill string1948 turbodrill1948 tubular1975 1678 J. Moxon Mech. Exercises I. i. 6 You may sometimes require..several Drill-strings; the strongest strings for the largest Drills. 1948 Petroleum Handbk. (Shell Internat. Petroleum Co.) (ed. 3) v. 82 The great weight needed to push the bit downward into the formations is concentrated at the bottom of the drill string. 1975 Offshore Progress—Technol. & Costs (Shell Briefing Service) 6 As the rig rises and falls with the heaving surface of the sea,..constant weight must be maintained through the drillstring on the drilling bit. 1979 R. Piper Story of Oil vi. 23 When boring for oil, a separate engine, apart from the one that raises and lowers the drill string, is needed to turn the drill stem. 1984 A. C. Duxbury & A. Duxbury Introd. World's Oceans iii. 83 (in figure) Acoustical sensor on drill string determines drill bit position. < as lemmas |
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