1. Williamson H.S. (2000) “Accuracy Prediction for Directional Measurement While Drilling”. Paper SPE 67616, SPE Drilling and Completion 15 (4), December 2000.
2. Torkildsen T., Harvardstein S.T., Weston J., Ekseth R. (2008) “Prediction of Wellbore Position Accuracy When Surveyed With Gyroscopic Tools”. Paper SPE 90408, SPE Drilling and Completion, March 2008.
3. Ekseth, R., Torkildsen, T., Brooks, A., Weston, J., Nyrnes, E., Wilson, H., Kovalenko, K. 2007. “High-Integrity Wellbore Surveys: Methods for Eliminating Gross Errors”. Paper SPE 105558 presented at the SPE/IADC Drilling Conference, Amsterdam, 20–22 February 2007.
4. Ekseth, R., Weston, J., Ledroz, A., Smart, B., Ekseth, A. 2011. “Improving the Quality of Ellipse of Uncertainty Calculations in Gyro Surveys to Reduce the Risk of Hazardous Events like Blowouts or Missing Potential Production through Incorrect Wellbore Placement”. Paper SPE 140192 presented at SPE/IADC Drilling Conference, Amsterdam, 1-3 March 2011
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