> For the complete documentation index, see [llms.txt](https://docs.innova-drilling.com/introduction/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.innova-drilling.com/introduction/innova-engineering-manual/well-seeker-x-manual/appendix-c-acknowledgements.md).

# Appendix C - Acknowledgements

ISCWSA – Collision Avoidance Calculations – Current Common Practice

ISCWSA – Error Model Revisions – Steve Grindrod – 08/10/09

ISCWSA – Standards – Hugh Williamson – 28/02/01

MWD TOOLFACE INDEPENDANT ERROR TERMS – Copesgrove Developments Ltd – 04/11/09

SPE9223 – BOREHOLE POSITON UNCERTAINTY, ANALYSIS OF MEASURING METHODS AND DERIVATION OF SYSTEMATIC ERROR MODEL – C.J.M Wolff, J.P. de Wardt

SPE11382 – CALCULATION OF NMDC LENGTH REQUIRED FOR VARIOUS LATITUEDS DEVELOPED FROM FIELD MEASUREMENTS OF DRILL STRING MAGNETISATION – S.J. Grindrod, J.M. Wolff – 20/02/83

SPE18051 – INSTRUMENT PERFORMANCE MODELS AND THIER APPLICATION TO DIRECTIONAL SURVEYING OPERATIONS –John L. Thorogood – 1990

SPE21261 – SIMPLIFIED EQUATIONS FOR PLANNING DIRECTIONAL AND HORIZONTAL WELLS –M.L. Wiggins, H.C. Juvkam Wold – 02/11/90

SPE36863 – AN IMPROVED METHOD FOR COMPUTING WELLBORE POSITION UNCERTAINTY AND ITS APPLICATION TO COLLISION AND TARGET INTERSECTION PROBABILITY ANALYSIS – Andrew G. Brooks, Harry Wilson – 22/10/96

SPE67616 – ACCURACY PREDICTION FOR DIRECTIONAL MEASUREMENT WHILE DRILLING – H.S. Williamson – 01/12/00

SPE84246 – A COMPENDIUM OF DIRECTIONAL CALCULATIONS BASED ON THE MINIMUM CURVATURE METHOD – S.J. Sawaryn, J.L. Thorogood – 01/03/05

SPE90408 – PREDICTION OF WELLBORE POSITION ACCURACY WHEN SURVEYED WITH GYROSCOPIC TOOLS – Torgeir Torkildsen, Stein T. Havardstein, John Weston, Roger Ekseth – 01/03/08

SPE110014 - A COMPENDIUM OF DIRECTIONAL CALCULATIONS BASED ON THE MINIMUM CURVATURE METHOD: PART 2 – S.J. Sawaryn – 11/11/07


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