Application of Moments in Qualitative Analysis on Borehole Trajectory Curving

Abstract:

There are many calculation methods of horizontal borehole trajectory, such as cubic spline interpolation function which is based on three-moment equation. By calculating the moments of deviation and azimuth from cubic spline interpolation function respectively, it is easy obtain functions of deviation and azimuth change rate and average borehole curvature to analysis on curving of borehole trajectory. So it is one of the most common methods. However, the moments are always be neglected. Moments of deviation and azimuth, which could be used to qualitatively estimate borehole trajectory curving, are first proposed tentatively in this paper. Synthetically employing other useful parameters of estimation borehole trajectory curving, tens of high-angle directional and horizontal wells’ drilling data is computed and analyzed. Contrast to the variation characteristics of deviation and azimuth change rate, the deviation and azimuth moments have the similar change tendency respectively. The results of this study signify that the proposed parameters could provide some reference for assessment on borehole trajectory curving.

• Periodical: Applied Mechanics and Materials (Volumes 713-715)
• Pages: 1635-1639
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.713-715.1635
• Online since: January 2015
• Authors: Rui Yuan, Yu Qiu Sun*
• Keywords: Borehole Trajectory, Cubic Spline Interpolation Function, Moments, Three-Moment Equation

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