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Use of Von Mises for connection when casing under compression

  • 1.  Use of Von Mises for connection when casing under compression

    Posted 06-12-2013 06:59 AM
    This message has been cross posted to the following Discussions: Well Integrity and SPE Connect Feedback .
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    While checking for casing connections, I calculated VON MISES at each critical point: Surface, TOC, Preveious casing shoe, float collar & float shoe. VON MISES always gives +ve value. So if at some point casing is under axial compression then should I use ratio of Connection compressive yield strength (lbf) to Von Mises stress(lbf) as safety factor available in my design?

    I have used, Von Mises stress (lbf) = Von Mises stress (psi) x critical cross section area of connection (inch2), is it correct?My calculated safety factor should be greater than 1.25 for N-80 casing or different design factor is required for connection under compression.


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    Varun Asthana
    DRILLING ENGINEER
    Hindustan Oil Expl. Co. Ltd.
    ChennaiTN
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