In a 6" hole provided the mud is weighted to a normal hydrostatic gradient you are probably seeing a slight negative correction depending on whose tool you are looking at. You can check the appropriate service company chart book and see what borehole size the tool is normalized to making sure the tool model you are using is applicable. As long as the ratio of counts being received at the long space and short space detectors are within tolerance the
DRHO should read close to zero. Small holes and certain mud properties will give a negative reading whereas lost pad contact in a rugose hole will give a positive DRHO.
