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Ap1.3.5 Relative Contribution of the Various Error Terms For the ISCWSA#1 test well (typical North Sea Extended reach well), the plots below show the relative contribution of the various error sources to the overall ellipse dimensions. The values below have been calculated based upon revision 2 of the MWD model. All the values here are quoted in Earth referenced (NEV) frame and it must be remembered that being independent the terms are summed by the RSS method.
90
Totals NN
80
ABX NN
ABY NN
ABZ NN
70
AMIC NN
AMID NN
60
ASX NN
ASY NN
ASZ NN
50
DBHG NN
DECG NN
40
DRFR NN
DSFS NN
DSTG NN
30
MBX NN
MBY NN
MBZ NN
20
MSX NN
MSY NN
10
MSZ NN
SAG NN
XYM1 NN
0
0
1000
2000
3000
4000
5000
6000
7000
8000
9000
XYM2 NN
-10
Figure 86a: North Axis Errors.
25
Totals EE
ABX EE
ABY EE
ABZ EE
20
AMIC EE
AMID EE
ASX EE
ASY EE
ASZ EE
15
DBHG EE
DECG EE
DRFR EE
DSFS EE
10
DSTG EE
MBX EE
MBY EE
MBZ EE
MSX EE
5
MSY EE
MSZ EE
SAG EE
XYM1 EE
XYM2 EE
0
0
1000
2000
3000
4000
5000
6000
7000
8000
Figure 86b: East Axis Errors.
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