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ISCWSA
Directional Survey Tool Error Model Results
 
Copsegrove Developments has implemented the ISCWSA MWD and Gyro survey tool error models in it's software package. This page contains the results and diagnostic files that may help others with their own implementation. The results cannot be guaranteed as accurate, but offer a set of data for use when comparing results.
 
The Diagnostic Files report the error terms in a standardised order to allow electronic file comparison. This order is given in a MS Excel file of the Error Sources.
 
 
ISCWSA MWD Error Models Rev. 4 (05-Jun-2015)
 
For completeness and reference, the various revisions of the ISCWSA MWD models have been compiled into a similar format to the OWSG Tool Error Model sets. They are available in the Microsoft Excel format from the link below: 
 
 
 
ISCWSA MWD Error Model Rev. 3
 
The current version of the MWD Error Model is Revision 4 [See MWD Error Model page] which is a toolface independent model.
 

The following diagnostic files are from the Copsegrove Developments Ltd software system. The results have been calculated assuming the ISCWSA well test profile azimuths are in True North.

 
Diagnostic Files (text Files):
 
 
If you find any errors, please contact us.
 
 
ISCWSA MWD Error Model Rev. 2
 
Revision 2 of the MWD model has been replaced by the toolface independent model Revision 3.
 
These results need to be read inconjuction with paper SPE 67616
 
MWD Rev.2 Results Summary - This PDF document updates SPE 67616 Table 3 with the Rev.2 MWD results.
 
Diagnostic Files (text Files):
 
 
 
 
 
Note: Test 5 and 6 have not been included as they use bias terms which are not recommended.
 
 
MWD Test Profile Differences
 
Test Profile Differences - This PDF document gives some possible reasons why your results may be different to those in the Diagnostic Files.
 
Gyro Error Model
 
The following diagnostic files are from the Copsegrove Developments Ltd software system. The results have been calculated assuming the test profile azimuths are in True North as in the MWD error model.
 
Diagnostic Files (text Files):
 
 
Gyro TypeISCWSA#1ISCWSA#2ISCWSA#3

Gyro Model#1

XY-Static

ISCWSA1_Gyro_1 

ISCWSA2_Gyro_1

ISCWSA3_Gyro_1 

Gyro Model#2

Z-Continuous

ISCWSA1_Gyro_2 

ISCWSA2_Gyro_2 

ISCWSA3_Gyro_2

Gyro Model#3

XY-Static & Continuous

ISCWSA1_Gyro_3 

ISCWSA2_Gyro_3 

Gyro Model#4

Z + XY Continuous

Gyro Model#5

XYZ-Continuous

ISCWSA1_Gyro_5 

ISCWSA2_Gyro_5 

ISCWSA3_Gyro_5

Gyro Model#6

XYZ-Static

ISCWSA1_Gyro_6

ISCWSA2_Gyro_6 

ISCWSA3_Gyro_6