12-letter words containing drill
- air drilling — Air drilling is a drilling method in which compressed air or nitrogen is used to cool the drill bit and lift cuttings out of the wellbore.
- breast drill — a geared drill that can be braced against the chest for additional leverage.
- drill collar — A drill collar is a thick tubular piece at the bottom of a drillpipe, which concentrates the weight on the rotating drill bit.
- drill string — (on a drill rig) the assemblage of drill pipes that link the drill bit to the mechanism that imparts rotary or reciprocating motion.
- drillability — Machinery, Building Trades. a shaftlike tool with two or more cutting edges for making holes in firm materials, especially by rotation. a tool, especially a hand tool, for holding and operating such a tool.
- drilling mud — a water-based or oil-based suspension of clays pumped into an oil well during drilling in order to seal off porous rock layers, equalize the pressure, cool the bit, and flush out the cuttings.
- drilling rig — rig (def 7).
- drillmasters — Plural form of drillmaster.
- hammer drill — a rock drill operated by compressed air in which the boring bit is not attached to the reciprocating piston
- quadrillions — Plural form of quadrillion.
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