Bit Selection and Hydraulics
The choice of bit should take into account the degree of re-active torque produced. For instance some PDC bits can make motor tool face control difficult resulting in erratic hole, increased torque and drag and low ROP’s.
The use of motor bearing tri-cone bits is often preferred for these sections.
Design Criteria for Selection of Tri-cone Bits
When selecting tri-cone bits it is necessary to consider:
- the maximum penetration rate required to limit open hole time
- extended bearing life to reduce . . .