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Center for Deep Earth Exploration (CDEX)

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High Strength and High Performance Drill Pipe

To drill into the Mantle, we need to lower drill pipe from the ship to reach the sea floor at about 4,000 m. From there, another 7,000 m of drill pipe is needed to reach below the sea floor down to the Mantle – at least 11,000 m of drill pipe! With this length of drill pipe, the forces that are combining to tear it apart, the weight of the drill pipe itself, dynamic tension owing from the motion of the vessel, bending moment, and additional forces including torque and hoop force during actual drilling operations, should be minimized as much as possible. Added to this is the importance of preventing drill pipe fatigue failure during long duration drilling operations. Taking all these needs into consideration, CDEX is developing 12,000 m-class high-strength and high-performance drill pipe.

Objectives

  • Aluminum drill pipe bending strength experiment

    Aluminum drill pipe bending strength experiment

  • Slip-crush experiment at Blohm+Voss GmbH.
  • Slip-crush experiment at Blohm+Voss GmbH.

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