Agenda
- GDIS Introduction
- Calibration and QC
- GDIS test parameters
- GDIS field test results
- Run Summary
- GDIS QC
- Survey comparison methodology
- Definitive survey comparisons
- Conclusions and Further work
GDIS Introduction
- GDIS
- MEMS solid state gyro
- Robust and low power
- Traditionally low accuracy
- 3 axis gyro reduced noise level
- Accurate flipping mechanism
- 2 minute survey time (Best survey pumped up)
- Continuous TF during sliding (3 axis gyro)
- Multiple surveys on every connection
- Module based system
- RPM/downlink/Pumps off survey triggers
GDIS Survey QC and Calibration
- QC
- Earth Rate
- Latitude
- Standard deviation Indicator (through rotation cycle)
- Shock & Vibration indicator
- Standard Deviation
- Calibration
- True North referenced stand
- Tool rotated at known references
- RT and HT
GDIS Test Parameters
- GDIS Test parameters
- Setting up for success
- Run in memory mode
- Run on platforms
- Multiple locations
- Variation in inclination and azimuth
- Temp limitation
- Develop empirical and lab based error model
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MEMS MWD gyro (GDIS)Field Test Analysis
Ross Lowdon