A structure consisting of coupled lengths of pipe or casing, which occupies the hole made in drilling for oil or gas.
- 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.
- You keep adding to the drill string until you reach the total depth of the well.
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