Results 171 to 180 of about 1,768 (208)
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Prediction of Helical / Sinusoidal Buckling
SPE/IADC Asia Pacific Drilling Technology, 1996Abstract A set of equations for helical and sinusoidal buckling under an ideal condition, where weight and frictional effects are not considered have been derived based on experimental and FEA data. An experimental method was developed canceling out frictional effects and FEA was carried out independently on both ...
H. Hishida +3 more
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On the buckling of helical compression springs
International Journal of Mechanical Sciences, 1992zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Becker, L. E., Cleghorn, W. L.
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SPE Drilling Engineering, 1988
Summary A new solution to helical buckling is presented yielding real helical shapes of buckled pipes with a varying helix pitch. This solution has been developed with the beam/column equation. The change in length and the bending stress can be computed from the helical-buckling solution. In addition, a new equation for tool clearance in
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Summary A new solution to helical buckling is presented yielding real helical shapes of buckled pipes with a varying helix pitch. This solution has been developed with the beam/column equation. The change in length and the bending stress can be computed from the helical-buckling solution. In addition, a new equation for tool clearance in
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On Lateral and Helical Buckling of a Rod in a Tubing
Journal of Canadian Petroleum Technology, 2006Abstract The paper analyzes lateral and helical buckling of a rod sub-merged in fluid in tubing. The purpose of the paper is to revisit the controversy regarding the formula for the helical buckling load that still exists in the literature. The relation between the critical helical buckling force and the helix-pitch
S.A. Lukasiewicz, C. Knight
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Helical Buckling of Tubing Sealed in Packers
Journal of Petroleum Technology, 1962Abstract Most gas wells and flowing oil wells are completed and treated through a string of tubing and a packer. Changes in temperature and in pressure inside or outside the tubing will:if free motion of the tubing inside the packer is permitted, increase or decrease the length of the tubing; orif free motion is ...
Arthur Lubinski, W.S. Althouse
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The Twist of a Helically Buckled Casing
Journal of Engineering for Industry, 1975When a casing buckles in three dimensions, torques, as well as bending moments, are developed. Since well casing is joined with threaded collars, it is necessary to know the magnitude of the twist of the casing to evaluate the risk of buckling failure.
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The Pitch of Helically Buckled Pipe
SPE/IADC Drilling Conference, 2005Abstract The most fundamental question about helically buckled pipe is "What is the pitch?" The original development by Lubinski and Woods1 used the method of virtual work to determine a specific constant pitch. Since any constant pitch will solve the buckling equations, what is special about this solution?
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Numerical Analysis of Helical Buckling
Proceedings of SPE Deep Drilling and Production Symposium, 1986Abstract The equilibrium equations for a helically buckled tubing with weight are solved by an approximate method that produces a generalized form of Lubinski's force-pitch relationship. This new solution provides a method for evaluating the range of application of Lubinski's results.
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Analysis of the Strength of Helical Buckling Tubing String
Applied Mechanics and Materials, 2014Deformation of helical buckling appears on tubing string under axial compressive loads, and it may even make the tubing string fail when the loads are excessively large. To make clear stress distribution and variation of helical buckling tubing string, the formulas of equivalent stresses inside and outside of the tubing string are deduced based on the ...
Da Hu Zhong +3 more
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Interactions between Torque and Helical Buckling in Drilling
SPE Annual Technical Conference and Exhibition, 1995Abstract The effects of torque on helical buckling are a concern in coiled tubing drilling. These effects are also important in conventional drilling of long horizontal wells. This paper presents theoretical models for the effects of torque on helical buckling, normal contact force, and pitch of helix in the curved well ...
X. He, G.W. Halsey, A. Kyllingstad
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