Overview:
• Add the Bz test to the standard set of QC tests for nonaxial interference corrected surveys
• Evaluate the Bh & Bv QC tests
• ISCWSA peer review welcomed
Total Magnetic Field/Dip Test
• Earth’s magnetic field strength and dip angle calculated from tool’s magnetometer and accelerometer outputs
• Compared with the Reference Field values
• Error model estimations for the directional sensors and the reference field define how well the two should agree
Drilling at 90/90
• Azimuth is sensitive to axial interference, Bt and Dip are not
• Standard QC tests are insensitive to excessive axial interference
– SPE 133417 (ISCWSA)
• Stimulus for finding new QC test
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Alternative MWD Magnetic QC-test
Inge Edvardsen - Baker Hughes