The collapse strength of tubulars with recess patterns machined into their walls is an important topic for oil field downhole tools, especially in hollow carrier perforating gun systems. This paper presents a study of the plastic collapse behavior of thick-walled tubulars (those with an outside diameter to thickness ratio of approximately ten) having different patterns of circular recesses (blind holes partially machined into the tubing wall) that are subjected to external pressure. An empirical relationship between the reduction in collapse strength and the periodic distribution of recesses was constructed to account for the weakening effects of recess diameter, recess depth, axial spacing, angular phasing, etc. This strength reduction factor was introduced into the Tamano formula to predict collapse strength of recessed tubulars. Applicability of this empirical formula was validated with the aid of nonlinear, postbuckling finite element analyses (FEA). The strength reduction factor in combination with the Tamano formula provides a simple way of parametrically predicting the collapse strength of tubulars having circular recess patterns.
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Rosharon, TX 77583
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March 2017
Research Papers
Plastic Collapse Behaviors of Tubulars with Recess Patterns—Application in Hollow Carrier Perforating Guns
David Iblings,
Rosharon, TX 77583
David Iblings
Schlumberger
, Rosharon, TX 77583
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Aleksey Barykin,
Rosharon, TX 77583
Aleksey Barykin
Schlumberger
, Rosharon, TX 77583
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Mohamed Mehdi
Mohamed Mehdi
1
1Corresponding authors.
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Haifeng Zhao
David Iblings
Schlumberger
, Rosharon, TX 77583
Aleksey Barykin
Schlumberger
, Rosharon, TX 77583
Mohamed Mehdi
1Corresponding authors.
Manuscript received January 28, 2016; final manuscript received September 6, 2016; published online November 21, 2016. Assoc. Editor: Ioannis Kougioumtzoglou.
ASME J. Risk Uncertainty Part B. Mar 2017, 3(1): 011004 (6 pages)
Published Online: November 21, 2016
Article history
Received:
January 28, 2016
Revision Received:
September 6, 2016
Accepted:
September 6, 2016
Citation
Zhao, H., Iblings, D., Barykin, A., and Mehdi, M. (November 21, 2016). "Plastic Collapse Behaviors of Tubulars with Recess Patterns—Application in Hollow Carrier Perforating Guns." ASME. ASME J. Risk Uncertainty Part B. March 2017; 3(1): 011004. https://doi.org/10.1115/1.4034660
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