The role of the ISCWSA Error Model Maintenance Group is to define the mathematical framework for modelling the uncertainty in wellbore surveying. This allows different companies to implement a consistent set of algorithms for error modelling.
In general, the ISCWSA does not define or supply the detailed magnitudes, (or error models, tool codes or IPM files) for a particular survey tool. It is our position, that the tool provider is the one who is best placed to assess the uncertainty when using their equipment. Therefore users should request tool codes from their tool provider.
The ISCWSA does not supply, check, certify or warrant the error models created by tool providers.
However, the ISCWSA has specified a generic MWD tool error model. It comes in eight variants for the various combinations of:
- standard MWD or axially (short collar) corrected surveys
- from a fixed or floating platform
- with or without sag correction
....
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Role of ISCWSA Error Model Committee - Rev2