The IADC drill bit dull grading system has held up quite well until now, however with the introduction of large automated systems, machine learning, evolving drill bit products and the requirement for more detailed data per run there is a need to improve the system.

The current IADC PDC drill bit dull grading codes were created in 1987 and revised in 1992 along with the roller cone codes.  The IADC codes are a compact, text-based way to describe the bit condition, containing limited categorization and quantification information. 

However, the IADC codes have some known limitations:

• The code set is focused on justification for pulling the bit, reusability, and wear; but does not capture details needed for detailed root cause analysis
• Codes require human expertise and are subject interpretation, no independent verification possible
• Evolving knowledge is difficult to capture
• No possibility to include other data such as digital pictures, etc.
• Limited support for fully automated drilling system processes

Objectives of IADC upgraded grade system:

• Rework the IADC Dull Grade System Code set to better support root cause analysis
• Eliminate or reduce the subjectivity inherent in the current system
• Support human and automated bit dull grading systems
• Create a digital storage format including searchable metadata allowing bit dull grading information to be used by real time automated drilling systems.
• The digital storage format should also be capable to be used in machine learning tools, selection of next bit/BHA, parameter optimization, mud/formation interactions, as well as redesign efforts, etc.
• The reworked dull grading system shall be backwards compatible with the current IADC bit dull grading system if possible.

This forum will have a quick overview on these issues as well as cover the emerging automated bit-grading systems.