Outline
- Wellbore position
- Inclination measurements
- Azimuth measurements
- Error models for Magnetic tools
- Error models for Gyro tools
- Error models and gross errors
- Conclusions and Recommendations
Azimuth
- Magnetic Reference
- Magnetic Tools
- Very stable sensors
- Variable reference
- Magnetic Tools
- Earth Rate Reference
- Rate Gyro tools
- Very stable reference
- Variable sensors
- Self oriented with the Earth Rate.
- Rate Gyro tools
- Continuous Mode
- Rate gyro tools
- Dependent of one initialization point
- Rate gyro tools
Quality Control for Magnetic Tools
- Internal Test in each shot
- Total Magnetic Field (H Total)
- Total Gravity (G Total)
- Dip angle
- Additional tests
- Repeated measurements with additional down-hole sensors
- Rotation Shot Misalignment Test Tool misalignment components For BHA-fixed tool
Rate Gyro - Gyro Compass Mode
- Accelerometers provide Inclination and Tool Face
- Gyro provides the direction to true North
....
View the entire Presentation:
Wellbore Position, Quality Control, Gross Errors and Error Models
Nestor Eduardo Ruiz, Gyrodata