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Title: Defining coiled tubing limits -- A new approach

Abstract

The burst, collapse and axial load operating limits for Coiled Tubing (CT) are currently established using the Von Mises incipient yield criterion. This criterion has historically been used to calculate the limits for oil country tubular goods (OCTG). The limits according to this criterion are based on the point at which the pipe material reaches a load state in which it begins to yield. Because of the bending that occurs when the CT is spooled on and off the reel, and when it is bent over the guide arch, the CT is already far beyond the yield point before it enters a well. Thus, this criterion does not really apply to CT. This paper describes a research project currently in progress. The purpose of this project is to define a new set of CT limits based on criteria other than incipient yield. This new approach to setting CT operating limits takes into account the internal residual stresses in the CT which are a consequence of repeated bending cycles and the accompanying change in material properties.

Authors:
; ; ;
Publication Date:
Sponsoring Org.:
Gas Research Inst., Chicago, IL (United States)
OSTI Identifier:
434036
Report Number(s):
CONF-960525-
TRN: IM9709%%470
Resource Type:
Conference
Resource Relation:
Conference: 28. offshore technology conference, Houston, TX (United States), 6-9 May 1996; Other Information: PBD: 1996; Related Information: Is Part Of 28. annual offshore technology conference: Proceedings. Volume 4: Field drilling and development systems; PB: 942 p.
Country of Publication:
United States
Language:
English
Subject:
02 PETROLEUM; PIPES; STANDARDS; MECHANICAL PROPERTIES; FIELD PRODUCTION EQUIPMENT; LIMITING VALUES; OIL WELLS; YIELD STRENGTH; RESIDUAL STRESSES

Citation Formats

Newman, K R, Sathuvalli, U B, Stone, L R, and Wolhart, S. Defining coiled tubing limits -- A new approach. United States: N. p., 1996. Web.
Newman, K R, Sathuvalli, U B, Stone, L R, & Wolhart, S. Defining coiled tubing limits -- A new approach. United States.
Newman, K R, Sathuvalli, U B, Stone, L R, and Wolhart, S. 1996. "Defining coiled tubing limits -- A new approach". United States.
@article{osti_434036,
title = {Defining coiled tubing limits -- A new approach},
author = {Newman, K R and Sathuvalli, U B and Stone, L R and Wolhart, S},
abstractNote = {The burst, collapse and axial load operating limits for Coiled Tubing (CT) are currently established using the Von Mises incipient yield criterion. This criterion has historically been used to calculate the limits for oil country tubular goods (OCTG). The limits according to this criterion are based on the point at which the pipe material reaches a load state in which it begins to yield. Because of the bending that occurs when the CT is spooled on and off the reel, and when it is bent over the guide arch, the CT is already far beyond the yield point before it enters a well. Thus, this criterion does not really apply to CT. This paper describes a research project currently in progress. The purpose of this project is to define a new set of CT limits based on criteria other than incipient yield. This new approach to setting CT operating limits takes into account the internal residual stresses in the CT which are a consequence of repeated bending cycles and the accompanying change in material properties.},
doi = {},
url = {https://www.osti.gov/biblio/434036}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Dec 31 00:00:00 EST 1996},
month = {Tue Dec 31 00:00:00 EST 1996}
}

Conference:
Other availability
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