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RESEARCH PAPERS: Drilling/Equipment Manufacturing

Post-Yield Strain Tests of 20-in. Casing With Weld-on Connectors

[+] Author and Article Information
W. R. Blackstone, T. L. Blose

Hydril Company, Houston, Tex. 77205

J. W. Galate

Enertech Engineering and Research Company, Houston, Tex. 77098

J. Energy Resour. Technol 105(4), 554-559 (Dec 01, 1983) (6 pages) doi:10.1115/1.3230969 History: Received November 15, 1982; Revised June 07, 1983; Online October 22, 2009

Abstract

Soils in permafrost regions may undergo significant subsidence due to thawing. Oil well surface casing embedded in such soils may be subjected to strains well beyond yield, whatever the casing properties might be. To deal with this, the State of Alaska has issued a specification defining the amount of axial strain that the casing, together with its connectors, must be able to withstand without parting. This paper presents full-scale tension and compression test data demonstrating that a particular weight and grade of 20-in. casing with premium weld-on connectors is a system exceeding those requirements. It is shown that, in tension, the material ultimate strength is reached first in the casing. Similarly, it is shown that, in compression, the casing buckles plastically before the connector fails.

Copyright © 1983 by ASME
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