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Influence of design features on the structural integrity of threaded pipe connections

Timothy Galle (UGent) , Wim De Waele (UGent) , Patrick De Baets (UGent) and Jeroen Van Wittenberghe (UGent)
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Abstract
When drilling and completing High Pressure High Temperature (HPHT) wells, the applied casing and tubing have to be able to withstand extreme conditions. Very often, the threaded connections are the most critical components in the entire chain. The overall design of several threaded and coupled (T&C) connections (eg. VAM TOP, JFEBear and the newest PatriotTC) is very similar. However, even by modifying one single feature of the geometry, an improved structural integrity (eg. fatigue resistance, leak tightness or collapse strength) can be obtained. This paper gives an overview of the most important geometrical features and discusses their alleged effects on the structural integrity of the coupling. At first, different thread designs were compared with each other and the effects on maximum allowable torque during make-up and tension during service conditions were evaluated. Secondly, literature shows that the use of an adequate torque shoulder is favourable, especially during the make-up stage. When designing connections for purposes involving gasses, a gastight seal is required. The third part of this paper discusses the influences on the sealability and performance limits when making changes to the sealing area. At last, the effect of overall changes (such as stress relief grooves) in the design and their consequences during running is shortly discussed. Based on this review, design guidelines for ‘optimized’ premium T&C couplings can be formulated.
Keywords
Design, Pipeline, Threaded Connection

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Chicago
Galle, Timothy, Wim De Waele, Patrick De Baets, and Jeroen Van Wittenberghe. 2011. “Influence of Design Features on the Structural Integrity of Threaded Pipe Connections.” In Sustainable Construction and Design, ed. Jeroen Van Wittenberghe, 2:237–245. Ghent, Belgium: Ghent University, Laboratory Soete.
APA
Galle, T., De Waele, W., De Baets, P., & Van Wittenberghe, J. (2011). Influence of design features on the structural integrity of threaded pipe connections. In J. Van Wittenberghe (Ed.), SUSTAINABLE CONSTRUCTION AND DESIGN (Vol. 2, pp. 237–245). Presented at the Sustainable Construction and Design 2011 (SCAD), Ghent, Belgium: Ghent University, Laboratory Soete.
Vancouver
1.
Galle T, De Waele W, De Baets P, Van Wittenberghe J. Influence of design features on the structural integrity of threaded pipe connections. In: Van Wittenberghe J, editor. SUSTAINABLE CONSTRUCTION AND DESIGN. Ghent, Belgium: Ghent University, Laboratory Soete; 2011. p. 237–45.
MLA
Galle, Timothy, Wim De Waele, Patrick De Baets, et al. “Influence of Design Features on the Structural Integrity of Threaded Pipe Connections.” Sustainable Construction and Design. Ed. Jeroen Van Wittenberghe. Vol. 2. Ghent, Belgium: Ghent University, Laboratory Soete, 2011. 237–245. Print.
@inproceedings{1176947,
  abstract     = {When drilling and completing High Pressure High Temperature (HPHT) wells, the applied casing and tubing have to be able to withstand extreme conditions. Very often, the threaded connections are the most critical components in the entire chain. The overall design of several threaded and coupled (T\&C) connections (eg. VAM TOP, JFEBear and the newest PatriotTC) is very similar. However, even by modifying one single feature of the geometry, an improved structural integrity (eg. fatigue resistance, leak tightness or collapse strength) can be obtained. This paper gives an overview of the most important geometrical features and discusses their alleged effects on the structural integrity of the coupling. At first, different thread designs were compared with each other and the effects on maximum allowable torque during make-up and tension during service conditions were evaluated. Secondly, literature shows that the use of an adequate torque shoulder is favourable, especially during the make-up stage. When designing connections for purposes involving gasses, a gastight seal is required. The third part of this paper discusses the influences on the sealability and performance limits when making changes to the sealing area. At last, the effect of overall changes (such as stress relief grooves) in the design and their consequences during running is shortly discussed. Based on this review, design guidelines for {\textquoteleft}optimized{\textquoteright} premium T\&C couplings can be formulated.},
  author       = {Galle, Timothy and De Waele, Wim and De Baets, Patrick and Van Wittenberghe, Jeroen},
  booktitle    = {SUSTAINABLE CONSTRUCTION AND DESIGN},
  editor       = {Van Wittenberghe, Jeroen},
  isbn         = {9789490726010},
  issn         = {2032-7471},
  language     = {eng},
  location     = {Ghent, Belgium},
  number       = {2},
  pages        = {237--245},
  publisher    = {Ghent University, Laboratory Soete},
  title        = {Influence of design features on the structural integrity of threaded pipe connections},
  volume       = {2},
  year         = {2011},
}