DIRECTIONAL

Gyroscopic Deviation
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)
Magnetic Deviation
Uses magnetometers & accelerometers instead of gyro
Can be stacked with other geophysical probes
Cannot measure in drill rods/steel casing
Rig Aligners
Align drill rig and rod angle prior to drilling
GPS Survey
High-resolution drill collar coordinates and elevation
Caliper
Acoustic Caliper
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



3-Arm Caliper
Mechanical caliper for measuring hole diameter
Applications similar to Acoustic Caliper above
Works in wet or dry hole
Cement Bond Log
Inspect quality of cement bond between casing and formation
Prevent water migration between isolated aquifers
