DIRECTIONAL

High accuracy hole deviation survey

Can be measured in drill rods/casing or open hole

Can be run in multishot mode (independent measurements at regular intervals) or continuous mode (faster survey where all measurements are taken relative to previous point)

Uses magnetometers & accelerometers instead of gyro

Can be stacked with other geophysical probes

Cannot measure in drill rods/steel casing

Align drill rig and rod angle prior to drilling

High-resolution drill collar coordinates and elevation

Acoustic scan of borehole wall, for complete hole profile

Can measure casing thickness to monitor wear (e.g. paste lines, utility wells, etc).

Locate fracture and breakout zones

Calculate hole volume for grout calculations

Analyze hole shape for geologic stress estimation

Requires fluid in hole

Mechanical caliper for measuring hole diameter

Applications similar to Acoustic Caliper above

Works in wet or dry hole

Inspect quality of cement bond between casing and formation

Prevent water migration between isolated aquifers