A structure consisting of coupled lengths of pipe or casing, which occupies the hole made in drilling for oil or gas.
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.