Advances in critical buckling load assessment for tubulars inside wellbores

Shide

et al. 2017

Shock and Vibration

A model of a multibody system is established to investigate the dynamic response of an oil tube-shock absorber-perforating gun system in downhole perforation-test joint operation. In the model, the oil tube and perforating gun are modeled as elastic rods and the shock absorber is modeled as single particle system with damping and a spring. Two force continuity conditions are used to simulate the interactions among the three components. The perforation impact load is determined by an experiment of underwater explosion of perforating bullets. Using the model, the effects of charge quantity of perforating bullet, the number of shock absorbers, and the length of oil tube on the dynamic response of oil tube and packer are investigated. On this basis, a basic principle of the combination design of shock absorber and oil tube is proposed to improve the mechanical state of downhole tools. The study results can provide theoretical support for the design of downhole perforation-test joint operation.

“…To investigate the perforation impact load on this mechanical behavior, an equation for calculating critical helical buckling load of tube string is used as follows [25]:…”

Section: Buckling Mechanical Behavior Of Oil Tube Stringmentioning

confidence: 99%

Study on Dynamic Response of Downhole Tools under Perforation Impact Load

Shide

et al. 2017

Shock and Vibration

Proceedings of the 4th Unconventional Resources Technology Conference

“…Characterization of buckling behavior of pipe in directional wells has been the focus of many other industry efforts and academic studies. Hajianmaleki and Daily (2014a) and Gao and Huang (2015) have recently published reviews on a vast amount of literature associated with tubular buckling inside vertical, inclined, horizontal, and curved wellbores. Most of the work on formulating relationships for buckling initiation loads and post-buckling side load responses have been focused on continuous pipes.…”

Section: Tubular Bucklingmentioning

confidence: 99%

Centralizer Selection and Placement Basis for Overcoming Liner Running Challenges in Extended-Reach Horizontal Three Forks Shale Completions

Long¹,

Abshire²,

Dall’Acqua³

2016

The URTeC Technical Program Committee accepted this presentation on the basis of information contained in an abstract submitted by the author(s). The contents of this paper have not been reviewed by URTeC and URTeC does not warrant the accuracy, reliability, or timeliness of any information herein. All information is the responsibility of, and, is subject to corrections by the author(s). Any person or entity that relies on any information obtained from this paper does so at their own risk. The information herein does not necessarily reflect any position of URTeC. Any reproduction, distribution, or storage of any part of this paper without the written consent of URTeC is prohibited.

“…However, the tubular string buckling in well engineering is more complex since other factors are involved such as wellbore constraint, tubular gravity, boundary conditions, friction force, torque, and so on. Until now, a lot of research on tubular string buckling has been done and newly results are continually published to promote the understanding of tubular string buckling (Hajianmaleki, 2014). In brief, the previous studies have developed from the following aspects (Gao and Huang, 2015): (1) Critical buckling loads and buckling configurations under different buckling modes in vertical (Lubinski, 1950;Mitchell, 1988;, horizontal, straightly inclined (Paslay and Bogy, 1964;Wu, 1992;Tan, 1993;Mitchell, 1997; and curved wellbores Mitchell, 1999); (2) The effects of torque, boundary condition (Mitchell, 1982;Sorenson and Cheatham, 1986;, friction force, connectors (Mitchell, 2003;Mitchell and Stefan, 2006;Huang and Gao, 2015), etc; (3) Research methods including beam-column model (Lubinski, 1977), buckling differential equation (Mitchell, © 2016.…”

Section: Introductionmentioning

confidence: 99%

A study of tubular string buckling in vertical wells

Gao

International Journal of Mechanical Sciences

2016

A new model depicting the full phase of tubular string buckling in vertical wellbores is proposed. The buckling modes of the tubular string are divided into: no buckling, 2D lateral buckling, 3D lateral buckling, continuous contact buckling and helical buckling. For the 2D lateral and 3D lateral buckling, the tubular string is respectively depicted by two and four suspended sections; for the continuous contact and helical buckling, the tubular string includes four suspended sections and one continuous contact section. With the suspended and continuous contact sections respectively depicted by beam-column model and buckling differential equation, the general buckling configurations of the entire tubular string are deduced. Substituting relevant continuity, boundary and stability conditions, the tubular string buckling problem is converted into a system of nonlinear equations. Solving these equations with iteration method, the critical buckling loads and the buckling configurations under different buckling modes for a weightless tubular string are obtained. Later, the weightless model is extended to the case for a tubular string with weight. On the basis of the new buckling model, the axial force and torque transfer along the tubular string under the coupling effect of friction force and buckling is discussed. The results show that the existence of tubular string weight increases the complexity of buckling mechanism and calculation. The continuous contact between the tubular string and wellbore reduces the axial force and torque transfer along the tubular string. To increase the axial force and torque transfer and inhibit buckling, the installation of stabilizers of low friction and buckling inhibition on the buckling-prone sections is wiser than unilaterally increasing the diameter and thickness of the tubular string. Compared with the previous results, the new model provides a more sophisticated description of tubular string buckling in vertical wellbores.