Damage index for Mud motor performance

Greetings to the professional audience.

Kindly ask to share your experience regarding Damage Index (DI) vs drilling time analysis and relation to drilling parameters ( ROP, WOB, RPM). 

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Update 21-November-2022:

The DI is a accumulative wear which is applicable to the PDM elastomer as well as for a bit to be able to control the while-drilling-parameters optimization process. Just as comparizon of the principle, it is like Tonemiles for the drilling line.

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