Torque&Drag in a drillpipe (Johancsik, 1984)

  • Thread starter Thread starter Ekaterina Wiktorski
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The discussion revolves around understanding Torque and Drag (T&D) calculations using the Johancsik model from 1984. A key point of confusion is the definition and calculation of F1, which is identified as an axial force related to drag. Participants clarify that once drag is calculated for one element, it can be used as F1 for subsequent elements in the calculation. Reference is made to page 22 of vdPoll's thesis, which discusses the stress-strain behavior relevant to drilling applications. Overall, the conversation aims to clarify the methodology for accurately performing T&D calculations in drilling scenarios.
Ekaterina Wiktorski
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Hi! Is anyone experienced With T&D calculations using above mentioned model:
upload_2016-3-22_11-14-21.png
upload_2016-3-22_11-13-14.png
?
I have a trouble to understand what exactly F1 is and how to calculate it. I know it is an axial force, so it is drag? And once you calculate drag for one element, you use it as F1 to calculate drag in 2ns element, is it correct?
 

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Page 22 in vdPoll thesis An investigation of the stress-strain behaviour of a GRE cylindrical structure used for a drilling-with-casing application and its influence on torsional vibrations
 
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