Drilling Bits

 

Drilling bits are essentially where the rubber meets the road in drilling the wellbore. There are two commonly used types of bits currently used in the industry: drag bits and roller cone bits. Drag bits typically have no moving parts, they consist of stationary cutters embedded within a matrix. The roller cone does have moving parts, the cone is essentially mounted on bearing that allows it to rotate, and the bearing in return is mounted to the bit leg.

Rock Failure Mechanism

Rock upon contact with the drill bit will fail, this will allow for the material to be broken up and removed from the well. However depending on the amount of force applied via the bit, the general characteristics of the rock and the use of fluid force, it will fail in a particular way.

  1. Wedging
  2. Scraping and grinding
  3. Erosion by fluid jet action
  4. Percussion or crushing
  5. Torsion or twisting
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