This paper presents a numerical study of the design of spoolable, continuous (often referred to as coiled tubing) composite tubing for oilfield applications. The composite tubing offers several advantages over traditional tubing such as lower weight, better fatigue characteristics, low ovality and intrinsic conductors built into the tubing which can be used for actuating downhole tools or monitoring the reservoir. However, significant drawbacks are in the more complicated design and analysis of the tubing. The design parameters are first determined for general applications, followed by simplified laminate plate analysis (modified for the curved geometry) and finally finite element analysis to verify the plate approximations. Design modifications are required and the iteration process continues. The simplified plate analysis is performed by optimizing stress fields of possible laminates (thousands) using thin laminated plate theory. The application is for thick cross-sections; therefore, the results have to be checked using a suitable tool-in this case finite element analysis.
Comparison of FEA and classical plate theory for thick-walled composite tubing
1998
Seiten
Aufsatz (Konferenz)
Datenträger
Englisch
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