Spring preloaded bearing assembly and well drilling...

E - Fixed Constructions – 21 – B

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E21B 3/02 (2006.01) E21B 33/03 (2006.01)

Patent

CA 2697694

A well drilling head comprises a housing and a bearing assembly. The housing has a sidewall structure defining a central bore. The bearing assembly includes an outer barrel, an inner barrel, bearing units and a preload force exerting member. The outer barrel has a central bore and the inner barrel is removably seated within the housing central bore. The bearing units are coupled between the barrels for providing concentric alignment of the barrels and allowing rotation therebetween. A first one of the bearing units is configured for carrying loads exerted radially between the barrels and a second one of the bearing units is configured for carrying loads exerted longitudinally between the barrels. The preload force exerting member maintains force on the longitudinal load carrying bearing unit and said barrels thereby preloading the longitudinal load carrying bearing unit.

L'invention porte sur une tête de forage de puits qui comprend un boîtier et un ensemble de paliers. Le boîtier a une structure de paroi latérale définissant un alésage central. L'ensemble de paliers comprend un cylindre extérieur, un cylindre intérieur, des unités de palier et un élément d'application de force de précharge. Le cylindre extérieur comporte un alésage central et le cylindre intérieur est reçu de façon amovible à l'intérieur de l'alésage central du boîtier. Les unités de palier sont couplées entre les cylindres pour fournir un alignement concentrique des cylindres et permettre une rotation entre ceux-ci. Une première unité des unités de palier est configurée pour supporter des charges exercées radialement entre les cylindres et une deuxième unité des unités de palier est configurée pour supporter des charges exercées longitudinalement entre les cylindres. L'élément d'application de force de précharge maintient une force sur l'unité de palier de support de charge longitudinale et sur lesdits cylindres, de façon à précharger ainsi l'unité de palier de support de charge longitudinale.

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