Torque&Drag in a drillpipe (Johancsik, 1984)

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SUMMARY

The discussion centers on Torque and Drag (T&D) calculations in drilling operations, specifically referencing the model by Johancsik (1984). Participants seek clarification on the axial force, denoted as F1, and its role in calculating drag. It is established that F1 represents the drag force for the first element, which is then utilized to determine the drag for subsequent elements. The reference to page 22 of vdPoll's thesis highlights the importance of understanding stress-strain behavior in drilling applications.

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  • Understanding of Torque and Drag calculations in drilling engineering
  • Familiarity with axial force concepts in mechanical systems
  • Knowledge of stress-strain behavior in materials
  • Experience with drilling models and simulations
NEXT STEPS
  • Review the Torque and Drag model outlined in Johancsik (1984)
  • Study the stress-strain behavior of materials as discussed in vdPoll's thesis
  • Explore advanced T&D calculation techniques for drilling operations
  • Investigate the impact of torsional vibrations on drilling performance
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Drilling engineers, mechanical engineers, and researchers focused on optimizing drilling operations and understanding Torque and Drag dynamics.

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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