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Center for Deep Earth Exploration (CDEX)

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Turbine Driven Coring System (TDCS)

The TDCS coring system is designed specifically for hard rock formations. The TDCS uses the drilling mud pumped down through the drill pipe to power an internal turbine system and extend the cutting shoe. Being able to keep the drill pipe stationary, or in a non-rotating state, while coring adds a distinct advantage in concentrating the strength and friction of the coring bit on the formation.

Objectives

  • Concept of TDCS

    Concept of TDCS

  • TDCS characteristics

    • Wireline coring tool, developed for Chikyu
    • Targeting hard or brittle rocks
    • Low WOB, high RPM
    • Ship heave is absorbed at a piston/cylinder

    Specifications

    • Core OD: 60 mm
    • Core Length: 4.5 m
    • Rotation: 0 – 1,300 RPM
    • Torque: 200 – 1,000 N-m
    • WOB: 5 – 10 kN
    • Pump Discharge: 800 -1,100 LPM
    • Flow rate at shoe: 100 – 150 LPM
    • Pressure loss: 4 – 7MPa
    • Total length: 17 m
    • Outer barrel OD/ID: 140/216 mm
  • Turbine Motor unit and blade

    Turbine Motor unit and blade

  • Various kinds of cutting Shoe to the hardness of the layers

    Various kinds of cutting Shoe to the hardness of the layers


    Rock core in a land examination

    Rock core in a land examination

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