NDLI: Effects on Plasticity and Structural Integrity of Tube Expansion

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Khan, Rashid Pervez, Tasneem Qamar, Sayyad Zahid
Copyright Year	2012
Abstract	This paper presents an investigation of the effects of cold expansion on plasticity and structural integrity of expandable tubulars. Down-hole tubular expansion has proven itself to be a vital technology in oil well applications. One of the challenges faced by researchers and field engineers in implementing and making down-hole tubular expansion technology cost effective is to conserve the structural integrity of tubular after the expansion process. Cold expansion affects the mechanical properties and induces residual stresses in the tubular, which could reduce its collapse, burst and fatigue ratings. Hence, a knowledge of variation of properties is required in correctly predicting the life span of tubular under given operational conditions. Cold expansion of tubulars under down-hole conditions is simulated at different strain rates using finite element method. The strain rates are varied by changing the velocity of mandrel used to expand the tubular. It is found that there are variations in contact pressure at tubular-mandrel interface, effective stress, equivalent plastic strain and thickness reduction during expansion process. These variations ultimately influence post-expansion properties of the tubular particularly the collapse and burst strengths, and hence its structural integrity. However, length shortening and surplus deformation have negligible effect on post-expansion properties of tubular.
Sponsorship	Pressure Vessels and Piping Division
Starting Page	607
Ending Page	616
Page Count	10
File Format	PDF
ISBN	9780791855027
DOI	10.1115/PVP2012-78654
Volume Number	Volume 3: Design and Analysis
Conference Proceedings	ASME 2012 Pressure Vessels and Piping Conference
Language	English
Publisher Date	2012-07-15
Publisher Place	Toronto, Ontario, Canada
Access Restriction	Subscribed
Subject Keyword	Collapse Deformation Oil wells Plasticity Mechanical properties Fatigue Engineers Residual stresses Finite element methods Pressure Stress
Content Type	Text
Resource Type	Article

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