Tubular Bending and Pull-Out Forces in High-Curvature Well Bores

[+] Author and Article Information
D. W. Dareing, C. A. Ahlers

Mechanical Engineering Department, University of Florida, Gainesville, FL 32611

J. Energy Resour. Technol 113(2), 133-139 (Jun 01, 1991) (7 pages) doi:10.1115/1.2905787 History: Received July 02, 1990; Revised April 11, 1991; Online April 16, 2008


This paper is concerned with drag forces developed on tubulars in high-curvature well bores typically found in drainhole and horizontal drilling. The dog-leg severity of these types of boreholes are considerably higher than those typically found in conventional directional drilling. The objective of the study was to determine the significance of bending stiffness on drag forces in the pull-out mode. The method of analysis treats the tubular as a multi-spanned curved beam under tension and solves for radial displacements, slope, shear and bending moment over each span. Calculations show that bending stiffness is a minor factor provided there are no locally severe dog legs superimposed in the high-curvature well bore.

Copyright © 1991 by The American Society of Mechanical Engineers
Topics: Force
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