Tubular Bending and Pull-Out Forces in High-Curvature Well Bores
Tubular Bending and Pull-Out Forces in High-Curvature Well Bores
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DOI：
10.1115/1.2905787
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发表时间：
1991-06
影响因子：
3
通讯作者：
D. Dareing;C. A. Ahlers
中科院分区：
文献类型：
--
作者：
D. Dareing;C. A. Ahlers
本文主要研究在排水井和水平井中，大曲率井眼中的管柱所受的阻力。这些类型的井眼的狗腿严重度比常规定向钻井中通常发现的狗腿严重度高得多。本研究的目的是确定抗弯刚度对拔出模式下阻力的重要性。分析方法将管视为受拉的多跨曲梁，并求解每个跨上的径向位移、斜率、剪力和弯矩。计算表明，如果在高曲率井眼中没有局部严重的狗腿叠加，则弯曲刚度是次要因素。
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.