A method for limiting the speed of a hoist mounted to a mobile well service rig involves determining a safe speed limit that ensures the hoist's capable stopping time is less than the maximum allowed time for stopping. In some examples, the maximum allowed time for stopping is based on the wellstring's modulus of elasticity and independent of the hoist's braking characteristics. The capable stopping time, however, is independent of the wellstring's modulus of elasticity and dependent on the hoist's braking characteristics.


    Access

    Download


    Export, share and cite



    Title :

    Electric well service rig with speed limiter


    Contributors:

    Publication date :

    2023-02-07


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    English


    Classification :

    IPC:    B66D Haspeln , CAPSTANS / E21B EARTH OR ROCK DRILLING , Erd- oder Gesteinsbohren



    Speed limiter

    YUAN DEJIE / ZHENG HAIJIANG | European Patent Office | 2016

    Free access

    Speed limiter

    ZOU JIACHUN / DAI YONGQIANG / LIU KUN et al. | European Patent Office | 2023

    Free access

    Speed limiter

    YAN GENYE | European Patent Office | 2015

    Free access

    Speed limiter

    KII YUJI / MARUYAMA TASUKU / MATSUURA MUNENORI | European Patent Office | 2015

    Free access

    Speed limiter

    ZOU JIACHUN / DING MINGXING / YAO RONGKANG et al. | European Patent Office | 2024

    Free access