Buckling and Lockup of Tubulars in Inclined Wellbores

1995 ◽  
Vol 117 (3) ◽  
pp. 208-213 ◽  
Author(s):  
J. Wu ◽  
H. C. Juvkam-Wold
Keyword(s):  
Contact Force ◽  
Inclination Angle ◽  
Compressive Load ◽  
Buckling Load ◽  
Entire Length ◽  
Frictional Drag ◽  
Axial Compressive Load ◽  
Helical Buckling

This paper studies sinusoidal and helical buckling of tubulars in inclined wellbores and the “lockup” of tubulars due to buckling. The results show that tubular buckling starts from the tubular bottom in low-inclination wellbores, where the axial compressive load is largest due to tubular weight. In high-inclination wellbores it may start from the top portion of the tubular, where the axial compressive load is largest due to frictional drag. This clarifies the confusion on whether or not the tubular buckles at once on its entire length in inclined wellbores. New sinusoidal and helical buckling load equations are presented to better predict tubular buckling in inclined wellbores (0–90 deg). The lower the wellbore inclination angle, the smaller the axial compressive load required to initiate tubular buckling. However, a certain nonzero axial compressive load is still needed to buckle the tubulars in vertical wellbores. When tubulars buckle helically, a large wall contact force will be generated, and the “slack-off” weight at the surface will not be fully transmitted to the tubular bottom due to large resultant frictional drag. The “lockup” of tubulars may even occur, where the tubular bottom load cannot be increased by slacking-off weight at the surface.

scholarly journals Uncertainty in Loading and Control of an Active Column Critical to Buckling

2012 ◽  
Vol 19 (5) ◽  
pp. 929-937 ◽  
Author(s):  
G.C. Enss ◽  
R. Platz ◽  
H. Hanselka
Keyword(s):  
Compressive Load ◽  
Buckling Load ◽  
Buckling Mode ◽  
Design Constraint ◽  
Critical Buckling Load ◽  
Axial Compressive Load ◽  
Load Carrying ◽  
And Control ◽  
Important Design ◽  
Weight Structures

Buckling of load-carrying column structures is an important design constraint in light-weight structures as it may result in the collapse of an entire structure. When a column is loaded by an axial compressive load equal to its individual critical buckling load, a critically stable equilibrium occurs. When loaded above its critical buckling load, the passive column may buckle. If the actual loading during usage is not fully known, stability becomes highly uncertain.This paper presents an approach to control uncertainty in a slender flat column structure critical to buckling by actively stabilising the structure. The active stabilisation is based on controlling the first buckling mode by controlled counteracting lateral forces. This results in a bearable axial compressive load which can be theoretically almost three times higher than the actual critical buckling load of the considered system. Finally, the sensitivity of the presented system will be discussed for the design of an appropriate controller for stabilising the active column.

scholarly journals Experimental and Numerical Analyses on the Buckling Characteristics of Woven Flax/Epoxy Laminated Composite Plate under Axial Compression

Polymers ◽  
2021 ◽  
Vol 13 (7) ◽  
pp. 995
Author(s):  
Venkatachalam Gopalan ◽  
Vimalanand Suthenthiraveerappa ◽  
Jefferson Stanley David ◽  
Jeyanthi Subramanian ◽  
A. Raja Annamalai ◽  
...  
Keyword(s):  
Environmental Sustainability ◽  
Composite Plate ◽  
Compressive Load ◽  
Laminated Composite ◽  
Green Composite ◽  
Laminated Composite Plate ◽  
Axial Compressive Load ◽  
Number Of Layers ◽  
Structural Applications ◽  
Ply Orientation

The evolution of a sustainable green composite in various loadbearing structural applications tends to reduce pollution, which in turn enhances environmental sustainability. This work is an attempt to promote a sustainable green composite in buckling loadbearing structural applications. In order to use the green composite in various structural applications, the knowledge on its structural stability is a must. As the structural instability leads to the buckling of the composite structure when it is under an axial compressive load, the work on its buckling characteristics is important. In this work, the buckling characteristics of a woven flax/bio epoxy (WFBE) laminated composite plate are investigated experimentally and numerically when subjected to an axial compressive load. In order to accomplish the optimization study on the buckling characteristics of the composite plate among various structural criterions such as number of layers, the width of the plate and the ply orientation, the optimization tool “response surface methodology” (RSM) is used in this work. The validation of the developed finite element model in Analysis System (ANSYS) version 16 is carried out by comparing the critical buckling loads obtained from the experimental test and numerical simulation for three out of twenty samples. A comparison is then made between the numerical results obtained through ANSYS16 and the results generated using the regression equation. It is concluded that the buckling strength of the composite escalates with the number of layers, the change in width and the ply orientation. It is also noted that the weaving model of the fabric powers the buckling behavior of the composite. This work explores the feasibility of the use of the developed green composite in various buckling loadbearing structural applications. Due to the compromised buckling characteristics of the green composite with the synthetic composite, it has the capability of replacing many synthetic composites, which in turn enhances the sustainability of the environment.

Challenging ICD & Swell Packers Completion Running in 3D Complex ERD Well With Continuous Swiveling to Break Frictional Drag and Helical Buckling

2018 ◽  
Author(s):  
Rudra Pratap Narayan Singh ◽  
Phalgun Paila ◽  
Rashid Khudaim Al-Kindi ◽  
Khalid Ahmed Al-Wahedi ◽  
Cliff Kirby ◽  
...  
Keyword(s):  
Frictional Drag ◽  
Helical Buckling

Axial Crushing of Multicorner Sheet Metal Columns

1989 ◽  
Vol 56 (1) ◽  
pp. 113-120 ◽  
Author(s):  
W. Abramowicz ◽  
T. Wierzbicki
Keyword(s):  
Sheet Metal ◽  
Compressive Load ◽  
Structural Plasticity ◽  
Finite Deformations ◽  
Kinematic Parameters ◽  
Arbitrary Angle ◽  
Axial Compressive Load ◽  
Crushing Force ◽  
Thin Walled ◽  
Theory And Experiments

A method is developed for predicting crush behavior of multicorner prismatic columns subjected to an axial compressive load. The corner element of an arbitrary angle is analyzed first using rigorous methods of structural plasticity with finite deformations and rotations. On that basis, crush predictions are made for multicorner columns with an even number of corners. Static crush tests on square, hexagonal, and rhomboidal thin-walled columns are also reported here. Good correlation between the theory and experiments was obtained for the magnitude of a mean crushing force and kinematic parameters describing the process of progressive folding.

scholarly journals Fatigue Damage in Diameter-enlargement Part Formed by Cyclic Bending and Axial Compressive Load

2014 ◽  
Vol 3 ◽  
pp. 1499-1504
Author(s):  
Xia Zhu ◽  
Kenichiroh Hosokawa ◽  
Keiji Ogi ◽  
Manabu Takahashi ◽  
Nagatoshi Okabe
Keyword(s):  
Fatigue Damage ◽  
Compressive Load ◽  
Cyclic Bending ◽  
Axial Compressive Load
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