An assembly for hoisting and lowering a drill string of a drilling rig is provided. The assembly includes a multiple displacement hydraulic cylinder having a blind end, a rod end, and a hollow single piston rod having a central tube located therewithin. A piston is connected to the piston rod. The interior space of the cylinder is defined by a blind end chamber, a rod end chamber and a central tube chamber, each having a port permitting switchable flow of hydraulic fluid into and out from the cylinder. The assembly has a pumping and switching system with hydraulic fluid connections connecting a primarypump to each port of the cylinder. The system is configured to pump hydraulic fluid and to switch the direction of hydraulic fluid flow through each of the ports of the three chambers, thereby providing the assembly with a plurality of hydraulic fluid flow path combinations, wherein each one of the combinations provides a different speed-to-force ratio for extending or retracting the piston rod, thereby hoisting or lowering the drill string. - 35- ---------------- . . . . . . . = . . . .. .. .. . . . - - -- --. .. . . . . . .. . .. . .. . to .. . . .. ri I 1' 4U Co~ enn


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    Title :

    HYDRAULIC MULTI-DISPLACEMENT HOISTING CYLINDER SYSTEM


    Contributors:

    Publication date :

    2021-02-18


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    English


    Classification :

    IPC:    E21B EARTH OR ROCK DRILLING , Erd- oder Gesteinsbohren / B66F HOISTING, LIFTING, HAULING, OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD , Hub-, Verhol- oder Schubvorrichtungen, soweit nicht anderweitig vorgesehen, z.B. Vorrichtungen mit unmittelbarer Krafteinwirkung auf die Last / F15B SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL , Druckmittelbetriebene Systeme allgemein



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