Operator Training - Drilling Principles India

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    Operator training

    Drilling principles

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    DRILLING PARAMETERS

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    DRILLING PARAMETERS

    What do we need for drilling?

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    What do we need for drilling?

    PERCUSSION

    FEED

    ROTATION

    FLUSHING

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    DRILLING PARAMETERS

    Percussion

    Create the stress wave

    Energy Piston RodShank

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    Percussion

    Piston velocity at impact : 10 m/s

    Energy Piston Stress wave Rod

    Stress wave (compressive force) accelerate to velocityof sound in steel, approx. 5140 m/second

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    Percussion

    The rock is crushed and the bit advances0,5 -1,0 mm

    Piston Shank Rod

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    Efficiency of the stress wave:

    Energy transmission into the rock. This is governed by

    the cross sectionnal area of the rod. the lenght of the stress wave (piston length). the rock penetration resistance of the bit (bit design and rock charasteristics). the weight of the bit.

    DRILLING PARAMETERS

    Percussion

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    DRILLING PARAMETERS

    Controling the stress wave:The most critical issue in controlling the stress wave is toavoid tensile reflections waves.

    The tensile stresses are directly responsible for prematurefailure due to fatigue.

    The tensile stresses are transmitted through the coupling by

    the thread surfaces. The Temperature of the shank is an indicator of tensile

    stress

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    Percussion

    DRILLING PARAMETERS

    Drilling into cavity will create extremely high tensile stresses

    Drilling with underfeed (or poor flushing) will lead to a initial gap between thebit and the rock. In the beginning of the bit indentation the situationresembles the previous case.

    Drilling with too low penetration resistance is close to the underfeedsituation (but with lower tensile amplitude). On the other hand tensilestresses will take place consistentently, not occasionally as with underfeed.

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    Percussion

    DRILLING PARAMETERS

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    Percussion

    Too high: short steel lifeToo low: poor penetration

    Lower pressure needed when:

    - collaring

    - uncoupling

    - hitting fractured and layered rock

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    DRILLING PARAMETERS

    What do we need for drilling?

    PERCUSSION

    FEED

    ROTATION

    FLUSHING

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    DRILLING PARAMETERS

    Used for keep the bitin contact with therock

    Feed

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    DRILLING PARAMETERS

    Under feeding

    Feed

    Video

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    DRILLING PARAMETERS

    Feed

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    DRILLING PARAMETERS

    Feed

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    PERCUSSION

    FEED

    ROTATION

    FLUSHING

    What do we need for drilling?

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    DRILLING PARAMETERS

    GOOD RPM

    For create an indexingdistance between twopercussion impacts

    Rotation

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    DRILLING PARAMETERS

    RPM TOO HIGH RPM TOO SLOW

    Rotation

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    Rotation

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    How to check if the RPM is correct practicaly?

    Rotation

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    DRILLING PARAMETERS

    PERCUSSION

    FEED

    ROTATION

    FLUSHING

    What do we need for drilling?

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    DRILLING PARAMETERS

    Flushing

    Removal of cuttings:

    Water, Air or Foam

    Space between hole and rod:

    Important for bailing velocity

    Insufficient flushing:

    reduced penetration rate

    risk of jamming

    Excessive wear of the rock tools