Elastic-plastic behavior and limit load analysis of casings

Nobuo Morita

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Citations (Scopus)

Abstract

Most companies producing from high compaction reservoirs continue using casings even if they find that these casings have been elongated or compressed exceeding the yield stress (Furui, et al., 2011). The magnitude of elongation and compression of these casings are often 3 to 5% while the strains at the yield strength are supposed to be 0.3-0.5%. Since casings are actually used beyond casing yield strength, field engineers should take into account the casing properties during plastic deformation. In this study, extension, compression and radial loading tests were conducted from H-40 to V-150 casings up to failure. The tests gave the following results: Under extension tests, the casings were uniformly deformed beyond the yield strength. The uniform deformation continued while the casings were stretched by 4 to 25% until non-uniform deformation was induced. The constitutive relations were constructed simulating the elastic and plastic deformations up to the failure. The radial compression tests showed stability of casings was maintained until the stresses at four cross-points of the stress concentration areas exceeded the yield strength. The higher grade casings did not significantly increase the maximum strength after yielding while lower grade casings significantly increased the strength while being stretched or compressed uniformly after yielding. The analyses show that the casings were uniformly deformed until the maximum strength so that they were usable. The peak load of the uniform deformation is the limit load since they rupture after the uniform deformation. When casings are compressed or extended by geo-technical loadings, thicker casings with a lower grade prevent rupture and kinks while higher grade casings tend to rupture with a large formation deformation. When casings are compressed by directional geo-technical load, the casings start losing the load-support capability after the stresses at four cross-points of the casings exceed the yield stress. Selecting a proper grade and thickness of casings are the key for mitigating casing failure where the data of casing deformation beyond the yield strength are essential information for casing designing using gcomechanical models.

Original languageEnglish
Title of host publicationSociety of Petroleum Engineers - IADC/SPE Asia Pacific Drilling Technology Conference 2014: Driving Sustainable Growth Through Technology and Innovation
PublisherSociety of Petroleum Engineers
Pages568-592
Number of pages25
ISBN (Print)9781634393454
Publication statusPublished - 2014
EventIADC/SPE Asia Pacific Drilling Technology Conference 2014: Driving Sustainable Growth Through Technology and Innovation - Bangkok
Duration: 2014 Aug 252014 Aug 27

Other

OtherIADC/SPE Asia Pacific Drilling Technology Conference 2014: Driving Sustainable Growth Through Technology and Innovation
CityBangkok
Period14/8/2514/8/27

Fingerprint

Load limits
Yield stress
plastic
Plastics
rupture
compression
plastic deformation
Plastic deformation
loading test
Elastic deformation
analysis
Stress concentration
Elongation
Loads (forces)
compaction
Compaction
Engineers
test
Industry

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geotechnical Engineering and Engineering Geology

Cite this

Morita, N. (2014). Elastic-plastic behavior and limit load analysis of casings. In Society of Petroleum Engineers - IADC/SPE Asia Pacific Drilling Technology Conference 2014: Driving Sustainable Growth Through Technology and Innovation (pp. 568-592). Society of Petroleum Engineers.

Elastic-plastic behavior and limit load analysis of casings. / Morita, Nobuo.

Society of Petroleum Engineers - IADC/SPE Asia Pacific Drilling Technology Conference 2014: Driving Sustainable Growth Through Technology and Innovation. Society of Petroleum Engineers, 2014. p. 568-592.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Morita, N 2014, Elastic-plastic behavior and limit load analysis of casings. in Society of Petroleum Engineers - IADC/SPE Asia Pacific Drilling Technology Conference 2014: Driving Sustainable Growth Through Technology and Innovation. Society of Petroleum Engineers, pp. 568-592, IADC/SPE Asia Pacific Drilling Technology Conference 2014: Driving Sustainable Growth Through Technology and Innovation, Bangkok, 14/8/25.
Morita N. Elastic-plastic behavior and limit load analysis of casings. In Society of Petroleum Engineers - IADC/SPE Asia Pacific Drilling Technology Conference 2014: Driving Sustainable Growth Through Technology and Innovation. Society of Petroleum Engineers. 2014. p. 568-592
Morita, Nobuo. / Elastic-plastic behavior and limit load analysis of casings. Society of Petroleum Engineers - IADC/SPE Asia Pacific Drilling Technology Conference 2014: Driving Sustainable Growth Through Technology and Innovation. Society of Petroleum Engineers, 2014. pp. 568-592
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