Question

Which list below lists bit type in order of softest to hardest rock application?

a)Milled-teeth tricone
b)insert tricone
c)PDC

Answer 1

In drilling operations for different rock hardness, the drill bits ranked from softest to hardest rock applications are: milled-teeth tricone, insert tricone, and PDC.

Step-by-step explanation:

The question pertains to the relative hardness of different types of drill bits used in drilling operations within the context of geological applications. Specifically, these tools are ranked according to their suitability for soft to hard rock formations. The correct order from the softest to hardest rock applications for the given bit types would be:

1. Milled-teeth tricone: Suited for soft rock formations, these bits have steel teeth which are milled directly into the cone's surface. They work by scraping and gouging the rock.
2. Insert tricone: These bits are more suitable for medium-hard rock formations as they possess tungsten carbide inserts instead of milled teeth, offering greater resistance and longevity than milled-teeth bits.
3. PDC (Polycrystalline Diamond Compact): The hardest and most durable, used for hard rock formations. PDC cutters consist of a layer of synthetic diamond, providing superior wear resistance and longevity.