For very soft formations with unconfined compressive strength less than 4,000 psi, which bit type is suitable? A) TCI B) PDC C) Milled Tooth D) Diamond
Understand the Problem
The question is asking about the suitable type of drill bit for very soft formations with a specific compressive strength. We need to identify which bit type (from the options given) is most appropriate for formations with an unconfined compressive strength of less than 4,000 psi.
Answer
PDC bits are suitable for very soft formations with unconfined compressive strength less than 4,000 psi.
The final answer is PDC (Polycrystalline Diamond Compact) bits.
Answer for screen readers
The final answer is PDC (Polycrystalline Diamond Compact) bits.
More Information
PDC bits are preferred for very soft formations due to their efficient cutting action and ability to handle low compressive strength materials.
Tips
A common mistake is confusing PDC bits with TCI or Milled Tooth bits, which are used for harder formations.
Sources
- Drilling Rock: Choosing the Proper Tool | Trenchless Technology - trenchlesstechnology.com
- Oteri, Vincent Akpojevwe.pdf - UiS Brage - uis.brage.unit.no
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