This density tool has two detectors at different spacings from a source of gamma radiation. The logs from each detector indicate the apparent density of the material surrounding the tool at a radius of investigation related to the spacing.
The Long Spaced Density detector (LSD) has a spacing of 48cm and the greatest depth of investigation.
The High Resolution Density detector (HRD) has a spacing of 24cm, this detector gives the greatest resolution but is more affected by borehole features such as linings and mud-cake.
Size:2250 x 38mm
2 – 5m / min
50 – 300mm*
Fluid filled or dry
Unlined or lined**
*For boreholes larger than 300mm this tool may be run sidewalled with multiple runs around different sides of the borehole.
**In lined or cased sections of boreholes these logs give qualitative information on the density of the borehole.