DRILL STRING ROD CENTRALIZER Russian patent published in 2005 - IPC

FIELD: boring equipment, particularly for drilling directional wells.

SUBSTANCE: centralizer has rod, pivotally connected casing halves with supports and retainer adapted to fix casing halves. Casing halves are provided with flat projections. Outer faces of the projections have additional rectangular extensions. Centralizer is provided with two additional casing halves with supports, slots and grooves having characteristics corresponding to that of pivotally connected case halve projections and located transversely to jointing plane. Circumferences and diameters of the supports of pivotally connected and additional casing halves are mutually aligned. Retainers are arranged in supports of additional casing halves, retainer ends are located in pivotally connected casing halves.

EFFECT: increased reliability of centralizer operation and service life thereof.

3 dwg