Drill bit 1
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what is a bit
the tool used to crush/scrape rock. bit selection has a big impact on well cost.
what is shear failure
occurs by exceeding the shear strength, involves the use of a bit tooth to shear, or cut, the rock into small pieces
what is compressive failure?
occurs by exceeding the compressive strength, requires that the load placed on the rock exceeds its compressive strength.
Rock failure will occur if?
- 1. The compressive strength of the rock exceeds the load (WOB)
- 2. The load is removed before it is transmitted from the bit tooth to the formation (RPM)
What is Mohr theory/criterion
Failure occurs when shear stress. ζ
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