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PDC bit rock interaction

A Polycristaline Diamond Compact bit (PDC bit) is composed of a steel or carbide tungstene matrix where different elements (PDC cutters, PDC trimmers, impact arrestors) are bound. To analyse the response (effort versus displacement) of a PDC bit, we have the following approach :

  • Assume the kinematic
  • Model elementary element / rock interaction
  • Sum all elementary forces

PDC rock interaction

View of chip formation

View of chip formation

The main element interacting with the formation is the PDC cutter. The kinematic approach enables to define cutter / rock interaction geometries according to bit design, PDC design and orientation and displacemnt of the bit.

Idealization of forces acting upon PDC cutter

Idealization of forces acting upon PDC cutter

Our PDC / rock interaction model was developped with our accademic partners on strongly validated through numerous lab tests. The mechanical behaviour of the formation at failure is analysed to calculate the forces at the cutting face, chamfer and wear flat.

Bit rock interaction

The elementary forces calculated with the PDC / rock interaciton model are summed to define the global relation between the kinematic and the forces and moment acting on the bit. Our model provides the axial and lateral responses of the bit and was validated on a full scale experiment.