Rotary drilling is described as a a drilling method in which a hole is drilled by a rotating bit to which a downward force is applied. The bit is fastened to and rotated by the drill stem, which also provides a passageway through which the drilling fluid is circulated. Additional joints of drill pipe are added as drilling progresses.
Ref: 123443/2006-10-14

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Drilling (Drilling -is described as the use of such a ...)

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