Helical Buckling of Pipes in Extended Reach and Horizontal Wells—Part
                    1: Preventing Helical Buckling

Wu, Jingwen; Juvkam-Wold, H.C.; Lu, Ruoxi

doi:10.1115/1.2905992

Cited by 33 publications

(20 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Schuh et al presented an analysis of the influence of curvature on the critical buckling force. The author assumed Dawson's model for sinusoidal buckling as causing helical buckling, which produces very conservative calculations [19,20]. Paslay et al derived an approximation solution about prebuckling mode originally using an energy method applied to a general displacement field; however, the subsequent behavior of the cylinder is not predicted.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation and Analysis of Dynamic Buckling of Drill String in Horizontal Well

Ren

Wang

Zhao

et al. 2017

Shock and Vibration

View full text Add to dashboard Cite

Buckling of tubulars has been the subject of many researches in the past. However, the models in previous research always followed the same assumptions: the friction and rotation effects are ignored. The assumptions are relatively far from the reality. This paper focuses on the rotational drill string in horizontal well. The differential equation of the dynamic buckling is established considering some various factors, including friction, the drill string-borehole interaction, and rotation, and the equations of the critical load of the sinusoidal buckling and the spiral buckling are derived. Furthermore, the friction curve of the drill string and the critical load of the dynamic buckling during rotation are obtained. In addition, the influence of the rotational speed on the dynamic buckling and the axis orbit of the dynamic buckling are also gained. The results show that the critical load of the sinusoidal buckling has nothing to do with the rotational speed while the amplitude and the frequency of the dynamic buckling become larger with the increase of the rotational speed, and the dynamic buckling presents a completely different state with the development of the axial load at different speed ranges.

show abstract

Section: Introductionmentioning

confidence: 99%

Experimental Investigation and Analysis of Dynamic Buckling of Drill String in Horizontal Well

Ren

Wang

Zhao

et al. 2017

Shock and Vibration

View full text Add to dashboard Cite

show abstract

“…. computer simulator was developed by use of a 3D soft-string model and modeling the build/turn section by the minimum-ofcurvature method (Zhang 2007). The simulator computes the axial-force distribution along the string during running-in operations and allows the user to evaluate whether the string can still slide with its own weight and reach the target depth of the section.…”

Section: Experimental Vs Theoretical Results and Model Validationmentioning

confidence: 99%

Buckling of Buoyancy-Assisted Tubulars

Arslan¹,

Ozbayoglu

Miska

et al. 2014

SPE Drilling &Amp; Completion

View full text Add to dashboard Cite

Use of buoyancy provides multiple solutions to overcome the drag problem for wells with shallow and high step-out profiles. Although both full-and partial-flotation methodologies have been used successfully to extend the reach in many field cases, the influence of buoyancy on tubular instability has not been investigated yet. This paper presents an extensive experimental and analytical study, focusing on static tubular instability inside horizontal wellbores with emphasis on buoyancy. In terms of the experimental research, running tubulars into horizontal wellbores was simulated with four different pipes, varying buoyancy, and varying loading speed. Throughout the tests, axial loads both applied to the pipe and transmitted through the pipe were recorded simultaneously, with respect to pipe displacement. Experiments reveal that currently existing models give reasonable approximations as long as buoyancy is not included in the tests. The major interpretation from the experiments is contrary to what currently existing expressions imply (i.e., tubular buckles immediately as effective weight approaches zero; even for naturally buoyant conditions, considerable amount of axial load is still required for both buckling initiation and helix formation). As buoyancy increases further, results and predictions diverge from each other considerably. To eliminate the discrepancies between results and predictions, theoretical study was conducted. Empirical correlations that also consider the influence of buoyancy on critical buckling loads are presented. Finally, another pipe was also tested within different buoyancy conditions to validate the equations developed. Experimental results of this pipe closely match the new analytical findings. This experimental and analytical study provides useful results for future applications with buoyancy-assisted tubulars, in terms of practical engineering and design calculations.

show abstract

“…(8) and (9) and derive the following two coupled nonlinear equations, » -6(0 y) ]<^ vj = 0 (14) q + ' = 0 (15) Therefore, instead of solving Eqs. (8) and (9) for _y and z, the task now is to solve for cj) from Eq. (14).…”

Section: (5)mentioning

confidence: 99%

“…Lubinski et al [4] used energy method to derive the relation between the edge thrust and the pitch of the circular helix. Different formulations for the critical loads and postcritical configurations, considering the effects of the inclination angle of the well and friction drag, were presented by other researchers [5][6][7][8][9][10][11][12][13][14][15][16]. Recently, this problem was extended to the situation when the constraining tube is curved [17,18].…”

Section: Introductionmentioning

confidence: 98%

On an Elastic Rod Inside a Slender Tube Under End Twisting Moment

Chen¹,

2011

Journal of Applied Mechanics

View full text Add to dashboard Cite

In this paper, we study the deformation of a thin ela.itic rod constrained inside a cylindrical tube and under the action of an end twisting moment. The ends of the rod are clamped in the lateral direction. Unlike the previous works of others, in which only the fully developed line-contact spiral was considered, we present a complete analysis on the deformation when the dimensionless twisting moment M^. is increased from zero. It is found that the straight rod buckles into a spiral shape and touches the inner wall of the tube at the midpoint when M^ reaches 8.987. As A/j increases to 11.472, the contact point in the middle splits into two, leaving the midpoint floating in the air. As M^ increases to 13.022, the midpoint returns to touch the tube wall and the two-point-contact deformation evolves to a three-point-contact deformation. Starting from A/, = 13.098, the point contact in the middle evolves to a line contact, cmd the deformation becomes a pointUne-point contact conflguration and remains so thereafter. In the case when the linecontact pattern is fully developed, it is possible to predict the spiral shape analytically. The numerical results are found to agree very well with those predicted analytically. Finally, an experimental setup is constructed to observe the deformation evolution of the constrained rod under end twist.

show abstract

Helical Buckling of Pipes in Extended Reach and Horizontal Wells—Part 1: Preventing Helical Buckling

Cited by 33 publications

References 0 publications

Experimental Investigation and Analysis of Dynamic Buckling of Drill String in Horizontal Well

Experimental Investigation and Analysis of Dynamic Buckling of Drill String in Horizontal Well

Buckling of Buoyancy-Assisted Tubulars

On an Elastic Rod Inside a Slender Tube Under End Twisting Moment

Contact Info

Product

Resources

About