Numerical and theoretical analysis of burst pressures for casings with eccentric wear

Numerical and theoretical analysis of burst pressures for casings with eccentric wear With the development of multilateral and extended-reach wells, trajectories of wellbores are becoming more complicated, and operating conditions are extending to higher temperatures and higher pressures. For safe down-hole operations, accurate predictions of casing burst strength are crucial. Based on the elastic–plastic theory for large deformations, we propose a three-dimensional finite element model (FEM) for predicting the burst pressure of a pipe having geometric eccentricity. Using the cross-sectional shape, we divide eccentric casings into two types: crescent-shaped and eccentric cylinder; then, we verify the accuracy and reliability of FEM results by comparing them to a series of full-scale experimental data. To estimate burst pressure, we derive a modified theoretical equation for eccentric pipes. Finally, we discuss how burst pressure is affected by wear radius and pipe eccentricity. Our results show that eccentricity has important effects on burst strength, whereas effects of wear radius are small. Our modified theoretical equation provides results that are consistent with experimental data published by others; moreover, the equation is more accurate and extends over a wider range of applications than previous equations. The FEM approach and the modified theoretical equation presented in this study are appropriate for predicting the burst pressures of pipes employed in the oil and gas industries. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Petroleum Science and Engineering Elsevier

Numerical and theoretical analysis of burst pressures for casings with eccentric wear

Loading next page...
 
/lp/elsevier/numerical-and-theoretical-analysis-of-burst-pressures-for-casings-with-AeGZG6fZhh
Publisher
Elsevier
Copyright
Copyright © 2016 Elsevier B.V.
ISSN
0920-4105
eISSN
1873-4715
D.O.I.
10.1016/j.petrol.2016.05.024
Publisher site
See Article on Publisher Site

Abstract

With the development of multilateral and extended-reach wells, trajectories of wellbores are becoming more complicated, and operating conditions are extending to higher temperatures and higher pressures. For safe down-hole operations, accurate predictions of casing burst strength are crucial. Based on the elastic–plastic theory for large deformations, we propose a three-dimensional finite element model (FEM) for predicting the burst pressure of a pipe having geometric eccentricity. Using the cross-sectional shape, we divide eccentric casings into two types: crescent-shaped and eccentric cylinder; then, we verify the accuracy and reliability of FEM results by comparing them to a series of full-scale experimental data. To estimate burst pressure, we derive a modified theoretical equation for eccentric pipes. Finally, we discuss how burst pressure is affected by wear radius and pipe eccentricity. Our results show that eccentricity has important effects on burst strength, whereas effects of wear radius are small. Our modified theoretical equation provides results that are consistent with experimental data published by others; moreover, the equation is more accurate and extends over a wider range of applications than previous equations. The FEM approach and the modified theoretical equation presented in this study are appropriate for predicting the burst pressures of pipes employed in the oil and gas industries.

Journal

Journal of Petroleum Science and EngineeringElsevier

Published: Sep 1, 2016

References

You’re reading a free preview. Subscribe to read the entire article.


DeepDyve is your
personal research library

It’s your single place to instantly
discover and read the research
that matters to you.

Enjoy affordable access to
over 18 million articles from more than
15,000 peer-reviewed journals.

All for just $49/month

Explore the DeepDyve Library

Search

Query the DeepDyve database, plus search all of PubMed and Google Scholar seamlessly

Organize

Save any article or search result from DeepDyve, PubMed, and Google Scholar... all in one place.

Access

Get unlimited, online access to over 18 million full-text articles from more than 15,000 scientific journals.

Your journals are on DeepDyve

Read from thousands of the leading scholarly journals from SpringerNature, Elsevier, Wiley-Blackwell, Oxford University Press and more.

All the latest content is available, no embargo periods.

See the journals in your area

DeepDyve

Freelancer

DeepDyve

Pro

Price

FREE

$49/month
$360/year

Save searches from
Google Scholar,
PubMed

Create lists to
organize your research

Export lists, citations

Read DeepDyve articles

Abstract access only

Unlimited access to over
18 million full-text articles

Print

20 pages / month

PDF Discount

20% off