Improved rotary roller reamer

E - Fixed Constructions – 21 – B

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Details

E21B 10/24 (2006.01) E21B 10/30 (2006.01)

Patent

CA 2154285

A rotary roller reamer (10) for a borehole has several rollers (11). Each roller (11) rotates about a fixed spindle (13) held at its ends in wedge blocks (14). The spindle (13) has two central passages (19), one at each end. At one end, passage (19) contains a freely slidable piston (21), which is subject to external pressure via a breather aperture (22). The other end passage (19) is blocked by a pressure plug (27) which, when removed, permits injection of grease through passages which include the bearing surfaces of the roller (11) and spindle (13). External pressure is applied to the grease through piston (21), so that there is little or no pressure differential to otherwise force mud into the bearing.

Un aléseur (10) à rouleaux rotatifs, destinés à un puits de forage, comprend plusieurs rouleaux (11) dont chacun tourne autour d'un axe (13) fixe maintenu à ses extrémités dans des cales en biseau. L'axe (13) comporte deux passages (19) centraux, un à chaque extrémité. A une extrémité, le passage (19) contient un piston (21) coulissant soumis à la pression extérieure par la présence d'une prise d'air (22). Le passage (19) de l'autre extrémité est fermé par un bouchon (27) de pression qui, une fois retiré, permet l'injection de graisse dans les passages qui incluent les surfaces de paliers du rouleau (11) et de l'axe (13). La pression extérieure est appliquée à cette graisse par le piston (21), de façon qu'il n'existe que peu ou pas de différence de pression qui chasse la boue dans les paliers.

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