Log well cuttings through a formation top

Practice the sequence you already learned for “Log well cuttings through a formation top” until the order feels automatic. Drill mud-logging order. A formation top is not called until lag is applied, the sample is washed, and the change is seen in more than one cup.

1. Compute lag so the sample matches the bit depth.
2. Catch the cuttings.
3. Wash the cuttings.
4. Describe lithology.
5. Note shows and gas.
6. Call a top only after the change holds across samples.
7. Notify the wellsite geologist and the company man.
8. Do not call a top from a single contaminated cup.