A coiled tubing injector (100), rollers (152) on the backside of grippers (106) on a gripper chain (102, 104) pass over at least one shallow groove or depression formed in, or gap between segments of, a planar roller contact surface of a skate (146, 148), thereby momentarily removing or reducing the force being applied by the skate (146, 148) to the grippers (106) as the grippers (106) pass through at least one predetermined location within a gripping zone of the coiled tubing injector (100). The reduction or removal of the force on the grippers (106) allows the grippers (106) to reset their positions on the tubing (109) at one or more predetermined locations in order to accommodate changes in the strain caused by changes in stress as the tubing (109) moves through the injector (100).


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    Title :

    Coiled tubing injector with strain relief


    Additional title:

    Einführungsvorrichtung für gewickelten Rohrstrang mit Spannungsentlastung
    Injecteur de tube enroulé avec dispositif de relâchement de contraintes


    Contributors:

    Publication date :

    2015-10-28


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    English


    Classification :

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



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