Abstract
The results of a directional survey are given in terms of azimuth and inclination of a borehole at a certain depth. In this chapter it will be assumed that all the necessary corrections (magnetic declination, gyro drift) have been applied to the survey results. This information must then be analysed to calculate the actual position of the wellbore at that survey station relative to the surface location. In order to do this the incremental distances ΔV, ΔE, ΔN between the successive survey stations must be calculated. With the coordinates of the upper station known, the coordinates of the lower station can be found by addition. The horizontal coordinates of a point are referred to as the “Northing” (or latitude) and the “Easting” (or departure).
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Further Reading
“A guide to accurate wellbore survey calculations”, P. Dailey, Drilling-DCW,May 1977.
“Directional survey calculation”, J. T. Craig and B. V. Randall, Petroleum Engineer,March 1976.
“Borehole position uncertainty. Analysis of measuring methods and derivation of systematic error model”, C. J. M. Wolff and J. P. deWardt, S.P.E. paper no. 9223.
“Analysis of uncertainty in directional surveying” J. E. Walstrom, A. A. Brown and R. P. Harvey, Journal of Petroleum Technology,April 1969.
“Program challenges directional survey accuracy claims”, M. Stephenson, Oil and Gas Journal,20 August 1984.
“An improved method for computing directional surveys”, G. J. Wilson, Journal of Petroleum Technology,August 1968.
“Synthesis of International Geomagnetic Reference field values”. D. R. Barra-dough and S. R. C. Martin. HMSO, Report No. 7111.
“Directional Drilling Survey Calculation Methods and Terminology”, API Bulletin D20,1985.
“Directional Survey Calculation Methods Compared and Programmed”. N. P. Callas, P. C. Novak, J. R. Henderson, Oil and Gas Journal,22 Jan 1979.
“How to get the best results from well surveying data”, J. L. Thorogood, World Oil,April 1986.
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© 1987 T. A. Inglis
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Inglis, T.A. (1987). Survey Calculations. In: Directional Drilling. Petroleum Engineering and Development Studies, vol 2. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-1270-5_9
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DOI: https://doi.org/10.1007/978-94-017-1270-5_9
Publisher Name: Springer, Dordrecht
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