Results 181 to 190 of about 1,768 (208)

New Concepts for Helical Buckling

SPE Drilling Engineering, 1988
Summary An approximate analytic solution for the helical buckling of tubing with weight has been determined. This solution has good accuracy except near the neutral point. The solution used by Lubinski to solve the helical-buckling problem is shown to be a special case of this new analytic solution. It is generally accepted that Lubinski'
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Study of Helical Buckling of Pipes in Horizontal Wells

Proceedings of SPE Production Operations Symposium, 1993
ABSTRACT This paper studies helical buckling, and also critical (sinusoidal) buckling, of pipes (tubing and drillstring) in horizontal wells. The large frictional drag of helically buckled pipes is also studied. Helical buckling is developed from critical (sinusoidal) buckling as the axial load keeps increasing.
Jiang Wu, H. C. Juvkam-Wold
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The Twist and Shear of Helically Buckled Pipe

Proceedings of SPE/IADC Drilling Conference, 2003
Summary The effect of torque on buckling was first recognized while designing hollow propeller shafts for ships. If buckling could be caused by torque, then perhaps torque could be induced by helical buckling. This effect has not been extensively studied because the assumption has always been that the effect was too small to be of ...
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Effects of Well Deviation on Helical Buckling

SPE Drilling & Completion, 1997
ABSTRACT Current helical buckling models are valid for vertical wells, but the validity of these solutions for deviated wells was not known. This paper describes the numerical solution of the non- linear buckling equations for arbitrary well deviation.
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Pathological Growth-Induced Helical Buckling of Blood Vessels

Journal of Elasticity
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Gui, T., Yin, S., Li, B., Feng, X.
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An Analysis of Helical Buckling of Long Tubulars in Horizontal Wells

Proceedings of SPE International Oil and Gas Conference and Exhibition in China, 1998
Abstract It is difficult to determine real helical configuration by the current energy method. This paper describes an analytical solution based on equilibrium method, which represents the real configuration of helically buckled tubular subjected to axial and torsion loading in horizontal wells. New results of axial
Gao Deli, FengWu Liu, BingYe Xu
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The helical buckling analysis of coiled tubing in offshore pipelines

Ships and Offshore Structures, 2018
Buckling deformation of pipe in actual bore hole will limit the maximum running depth and is likely to further damage the drilling pipe, causing huge losses.
Feng Guan, Hua Qin, Chen An, Qifeng Jiang, Shaohu Liu, Weiguo Ma, Ting Yang, Jiwei Wu   +7 more
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Simple Frictional Analysis of Helical Buckling of Tubing

SPE Drilling Engineering, 1986
Summary Previous analyses of helical buckling of tubing have not considered frictional forces. In this paper, differential equations are derived and solved for two simplified cases of interest: downward motion of the tubing—e.g., when buckling occurs during the landing of the tubing—and upward motion of the tubing—e.g., when buckling ...
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The Buckling Behavior of Rectangular-Bar Helical Compression Springs

Journal of Applied Mechanics, 1994
Buckling design charts are presented for rectangular-bar helical compression springs with clamped ends, demonstrating the 1 effect of the number of turns of the spring.
L. E. Becker, W. L. Cleghorn
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Measurement and Analysis of Induced Torsion in Helically Buckled Tubing

Proceedings of SPE/IADC Drilling Conference, 2005
Summary In the original publication on helical buckling by Lubinski et al. (1962), it was assumed that no torsion can be developed in buckled tubular string (Lubinski–Woods problem) if there is no casing-to-tubing friction and tubing remains in an elastic range of bending.
A. Zdvizhkov, S. Miska, R. Mitchell
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