Monday, 13 November 2017

PDC Bit Body Design


PDC Body design matrix and steel

The bit body may be 

  1. Steel Body :
    A- The bit body is forged or milled from steel (steel-bodied bits).

    B-  The cutters on a steel body bit are manufactured as studs.

    C- The stud can be set with a fixed backrake and/or siderake (visit the cutter design subject).

    D- Field experience with the steel body bit indicates that face erosion is a problem, but this has been overcome to some extent by application of a hardfacing compound.

    E- Steel body bits also tend to suffer from broken cutters as a result of limited impact resistance (Figure 20). This limited impact resistance is because there is no support to the stud cutter.

    F- They are preferable as they can be easily repaired but suffer from erosion.

  2. Matrix Body :
    A- Matrix Body Bits are constructed in a cast from tungsten carbide (matrix bit).

    B- They are more resistant to erosion but are prone to bit balling in soft clay formations due to their low blade height compared with steel bodied bits.

    C- Matrix body bits have an economic disadvantage because the raw materials used in their manufacture are more expensive.




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