Overview:
- Casing surveys with proper running gear provide the best directional measurement
- Use of a ccl or gamma-ray for wireline correlation ensures measured depth accuracy
- Pre-and-post job field calibrations monitor mass unbalance performance
- Drop surveys save time by enabling surveys while tripping
In-Run Quality Control
- Gyrocompass
• Inclination QC is generally the same as with
- MWD systems
• Comparison against theoretical ERH is the primary QC measure
• Additional measures include gyro output stability and gyro bias stability.
- Continuous Surveying
• Zero-velocity drift checks are used to compensate for bias, mass unbalance, and
- Earth Rate effects
• QC measures ensure that drift variation matches predicted values
....
View the entire Presentation:
Gyro Technology in Oil and Gas
Ben Hawkinson and Steve Mullin - SDC and Gyrodata