Definition of drill string in English:

drill string

noun

单词	drill string
释义	Definition of drill string in English: drill string noun A structure consisting of coupled lengths of pipe or casing, which occupies the hole made in drilling for oil or gas. 钻杆组，钻具组 Example sentencesExamples The first end of the shaft is connectable to the drill string of a horizontal boring machine. You keep adding to the drill string until you reach the total depth of the well. A 400-ton heave compensator keeps the drill string stable relative to the sea floor. Vibration of the drill string may also reduce the friction between the drill string and the hole, resulting in lower torque requirements. Mud is injected into the drill string, up a borehole and through the blowout preventor adjacent the sea floor.
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