Dull bit grading is a standard method to grade the bit and it will also help personnel to understand bit performance better. However, it is sometimes very difficult to understand the meaning of the codes showing in the grading because you’ve never seen these dull characteristics before. Especially, there are new people who start to work in the oilfield therefore it is very critical to have them learn the correct way to do the bit grading in a short period of time.
One of my friends shares this very useful dull bit grading created by Smith Bit company and I can say that this is an excellent book to help you grade the bit correctly.
