Page | 168
B4 - MWD Defined Error Magnitudes – Revision 3 The table below defines all MWD error magnitudes at revision 3. The revision 4 changes introduce look up tables for the reference magnitude field terms DEC-G and DBH-G. Some models may also include DEC-R and DBH-R to take into account random fluctuations in the reference field. These are not explicitly includes in the standard model. Error Code Description MWD MWD with Axial Interference Correction 1 ABXY-TI1 Accelerometer bias xy – term1 0.004ms -2 2 ABXY-TI2 Accelerometer bias xy – term2 0.004ms -2 3 ABZ Accelerometer bias z-axis 0.004ms -2 4 ASXY-TI1 Accelerometer scale factor xy – term1 0.0005 5 ASXY-TI2 Accelerometer scale factor xy – term2 0.0005 6 ASXY-TI3 Accelerometer scale factor xy – term3 0.0005 7 ASZ Accelerometer scalefactor z-axis 0.0005 8 MBXY-TI1 Magnetometer bias xy – term1 70nT 9 MBXY-TI2 Magnetometer bias xy – term2 70nT 10 MBZ Magnetometer bias z-axis 70nT 11 MSXY-TI1 Magnetometer scale factor xy – term1 0.0016 12 MSXY-TI2 Accelerometer scale factor xy – term2 0.0016 13 MSXY-TI3 Magnetometer scale factor xy – term3 0.0016 14 MSZ Magnetometer scalefactor z-axis 0.0016 15 DEC Constant declination error 0.36˚ 0.36˚ 16 DBH cl n on o d p nd n on h ho zon lcompon n ofE h’sf ld 5000nT 5000nT 17 SAG BHA Sag 0.2˚ 0.2˚ 18 AZ Constant axial magnetic interference 0.25˚ 19 AMID Direction dependant axial magnetic interference 0.6˚ 20 XYM1 xy misalignment 1 0.06˚ 0.06˚ 21 XYM2 xy misalignment 2 0.06˚ 0.06˚ 22 XYM3 xy misalignment 3 0.06˚ 0.06˚ 23 XYM4 xy misalignment 4 0.06˚ 0.06˚ 24 ABIXY-TI1 Accelerometer bias xy – axial interference correction – term1 0.004ms -2 25 ABIXY-TI2 Accelerometer bias xy – axial interference correction – term2 0.004ms -2 26 ABIZ Accelerometer bias z-axis when axial interference correction applied. 0.004ms -2 27 ASIXY-TI1 Accelerometer scale factor xy – axial interference correction – term1 0.0005 28 ASIXY-TI2 Accelerometer scale factor xy – axial interference correction – term2 0.0005 `29 ASIXY-TI3 Accelerometer scale factor xy – axial interference correction – term3 0.0005 30 ASIZ Accelerometer scalefactor z-axis when axial interference correction applied. 0.0005 31 MBIXY-TI1 Magnetometer bias xy – axial interference correction – term1 70nT 32 MBIXY-TI2 Magnetometer bias xy – axial interference correction – term2 70nT 33 MSIXY-TI1 Magnetometer scale factor xy – axial interference correction – term1 0.0016 34 MSIXY-TI2 Magnetometer scale factor xy – axial interference correction – term2 0.0016
Made with FlippingBook flipbook maker