Combined Effects of Wellbore Curvature, Connector, and Friction Force on Tubular Buckling Behaviors

SPE Journal ◽  
2019 ◽  
Vol 24 (05) ◽  
pp. 2083-2096 ◽  
Author(s):  
Wenjun Huang ◽  
Deli Gao
Keyword(s):  
Potential Energy ◽  
Friction Force ◽  
Energy Method ◽  
Combined Effects ◽  
Mechanical Behaviors ◽  
Buckling Loads ◽  
New Model ◽  
Column Model ◽  
Helical Buckling ◽  
Relevant Factors

Summary A tubular buckling model is built, while considering the combined effects of wellbore curvature, tubular connector, and friction force. On the basis of certain assumptions, the expressions of critical helical–buckling loads are deduced with the equivalent beam–column model and energy method and the amendment factors of critical buckling loads because of relevant factors are obtained. The results from the new model are compared with those from previous models and experiments. The roles of relevant factors in tubular mechanical behaviors are discussed. It is indicated that wellbore curvature affects equivalent tubular–string weight, the connectors affect potential energy, and friction force leads to dissipative energy in the buckling–initiation process. Critical helical–buckling loads are most likely underestimated if the combined effects are not considered.

Onset and Post Buckling of Pipe-in-Pipe’s Helical Buckling Using Improved Energy Method

2018 ◽  
Author(s):  
Lixin Gong
Keyword(s):  
Potential Energy ◽  
Energy Method ◽  
Normal Force ◽  
Horizontal Wells ◽  
Energy Methods ◽  
Buckling Mode ◽  
Buckling Behavior ◽  
Post Buckling ◽  
Helical Buckling ◽  
Remarkable Agreement

The purpose of this paper is to present theoretical solutions based on an improved energy method for predicting the helical buckling (HB) behavior of pipes in vertical, inclined, and horizontal wells. The energy method has been applied to solve the pipe-in-pipe’s (PIP) helical buckling behavior since Lubinski, et al [2] in the 1950’s. However, in the preceding studies, the energy methods are not yet completely correct because the pipe’s potential energy of the distributed contact normal force induced by the helical buckling was considered to be negligible. This deficiency caused improper deductive procedures. In this paper, the energy method is improved by adding the term of the potential energy of the distributed contact normal force. With this improvement, not only can the PIP’s critical helical buckling forces be successfully derived, but it also provides a deeper insight on the PIP’s helical buckling onset, as well as the post helical buckling behavior. For inclined and horizontal wells, equations are provided to determine the critical forces required to initiate the helical buckling mode for both “long” and “short” pipes. In addition, the post buckling behavior is also described, and a new concept of helical buckling zone (HBZ) for “short” pipes is introduced based on the force-pitch plots as an area in-between the helical buckling’s onset curve and the classical Lubinski curve. Finite element ABAQUS models have also been utilized to confirm the analysis using the improved energy method. And the ABAQUS results show remarkable agreement with the theoretical solutions.

Buckling Analysis of Symmetric Cross-Ply Laminated Annular Plates with Carbon Nanotubes

2014 ◽  
Vol 592-594 ◽  
pp. 901-905
Author(s):  
Pankaj Kumar ◽  
Pandey Ramesh
Keyword(s):  
Carbon Nanotubes ◽  
Boundary Condition ◽  
Carbon Nanotube ◽  
Aspect Ratio ◽  
Energy Method ◽  
Buckling Analysis ◽  
Buckling Load ◽  
Buckling Loads ◽  
Annular Plates ◽  
Buckling Behavior

The Paper presents the buckling response of composite annular plates with under uniform internal and external radial edge loads using energy method. For the equation of stability Trefftez rule is used. The paper consists of buckling behavior of laminate (90/0) s, influence of some parameters such as thickness, boundary condition, aspect ratio on buckling loads and modes are investigated. Present results are compared with other papers. In this paper the effect of % weight of carbon nanotube (MWCNT) on the buckling load is also investigated.

scholarly journals Relevant Factors in the Process of Socialization, Involvement and Belonging of Descendants in Family Businesses

Innovar ◽  
2017 ◽  
Vol 27 (63) ◽  
pp. 61-76 ◽  
Author(s):  
Melquicedec Lozano Posso ◽  
David Urbano
Keyword(s):  
Human Resources ◽  
Family Business ◽  
Family Businesses ◽  
New Model ◽  
Quantitative Survey ◽  
The Family ◽  
Knowledge Leadership ◽  
Relevant Factors

This research works toward the identification of the factors that comprise the process of socialization, involvement and initial belonging of descendants in family businesses and the key relationships between them. By means of a qualitative detailed study of four cases, complemented by a quantitative survey of 274 Colombian family businesses, the authors generate a new model that takes into account both factors explored in previous research as well as others identified in this study. Findings confirm the specific dependency of each stage on the subsequent ones; socialization influences involvement, which in turn influences the belonging of the descendants to the family business, with a strong presence of factors such as knowledge, leadership, mode, timing, and motivation. Those responsible for the orientation of potential successors may examine these findings in order to optimize their preparation efforts and support of family human resources for the continuity of the business.

scholarly journals Modeling and analysis of mesh stiffness for straight beveloid gear with parallel axes based on potential energy method

2018 ◽  
Vol 12 (7) ◽  
pp. JAMDSM0122-JAMDSM0122 ◽  
Author(s):  
Chaosheng SONG ◽  
Siwei ZHOU ◽  
Caichao ZHU ◽  
Xingyu YANG ◽  
Zufeng LI ◽  
...  
Keyword(s):  
Potential Energy ◽  
Energy Method ◽  
Mesh Stiffness ◽  
Modeling And Analysis ◽  
Potential Energy Method

scholarly journals Prediction Model of Mechanical Extending Limits in Horizontal Drilling and Design Methods of Tubular Strings to Improve Limits

2017 ◽  
Vol 2017 ◽  
pp. 1-18
Author(s):  
Wenjun Huang ◽  
Deli Gao ◽  
Yinghua Liu
Keyword(s):  
Optimal Design ◽  
Horizontal Well ◽  
Weight Ratio ◽  
Design Model ◽  
Constraint Factor ◽  
Horizontal Drilling ◽  
Buckling Loads ◽  
Drilling Parameters ◽  
Helical Buckling

Mechanical extending limit in horizontal drilling means the maximum horizontal extending length of a horizontal well under certain ground and down-hole mechanical constraint conditions. Around this concept, the constrained optimization model of mechanical extending limits is built and simplified analytical results for pick-up and slack-off operations are deduced. The horizontal extending limits for kinds of tubular strings under different drilling parameters are calculated and drawn. To improve extending limits, an optimal design model of drill strings is built and applied to a case study. The results indicate that horizontal extending limits are underestimated a lot when the effects of friction force on critical helical buckling loads are neglected. Horizontal extending limits firstly increase and tend to stable values with vertical depths. Horizontal extending limits increase faster but finally become smaller with the increase of horizontal pushing forces for tubular strings of smaller modulus-weight ratio. Sliding slack-off is the main limit operation and high axial friction is the main constraint factor constraining horizontal extending limits. A sophisticated installation of multiple tubular strings can greatly inhibit helical buckling and increase horizontal extending limits. The optimal design model is called only once to obtain design results, which greatly increases the calculation efficiency.

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