Dull Bit Grading
Dull bit grading is the method of evaluating the condition of a drill bit used for drilling after it is pulled out of the hole. The method uses a system developed by the International Association of Drilling Contractors (IADC). The pulled-out bit is inspected to identify wear and damage to the cutting structure and other parts of the bit. A precise dull bit grading can help to identify the effects of operating parameters and drilling dysfunctions in drilling a particular formation type. It provides vital clues to improve bit design and optimize bit selection for different drilling scenarios