rotary drilling
rotary drilling The process of cutting a borehole in which ground is cut or crushed by a rotating drill system, using a drill bit turned by means of a kelly. Engineering and shallow studies usually involve either a mast or an A-frame. Deep drilling is usually from a derrick. See also CABLE DRILLING. Compare PERCUSSION DRILLING.
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Cut , cut / kət/ • v. (cut·ting ; past and past part. cut ) [tr.] 1. make an opening, incision, or wound in (something) with a sharp-edged tool or object:… Cutting , Cutting
The Oxford English Dictionary notes that the first recorded reference to the word "tailor" was made in 1297. By that date, guilds for tailori… Crew Cut , Also known as a G.I., or government issue, haircut, the standard crew cut is a variation on the buzz cut, a regulation haircut given to servicemen in… cutout , cut·out / ˈkətˌout/ (also cut-out) • n. 1. a shape of a person or thing cut out of cardboard or another material. ∎ fig. a person perceived as charac… cutter , cut·ter / ˈkətər/ • n. 1. a person or thing that cuts something, in particular: ∎ a tool for cutting something, esp. one intended for cutting a parti… Chop , chop / chäp/ • v. (chopped , chop·ping ) [tr.] cut (something) into small pieces with repeated sharp blows using an ax or knife. ∎ (chop something of…
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rotary drilling