... comparing the average footage drilled with the new-style bit on 73 runs to 196 runs with conventional hammer bits. Utilizing the new bit technology enabled the operator to drill approximately 58% more footage at high ROP. The increased durability has reduced the number of bits/trips required to complete...

... a new approach, which characterizes rocks by their drilling difficulty , is used to establish field trends. Considering offsets, or anticipated performance requirements, bit development and/or selection is done with the aid of two new parameters – stress and durability equivalencies. Finally...