Down reaming apparatus

E - Fixed Constructions – 21 – D

Patent

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Details

E21D 1/06 (2006.01) E21B 4/18 (2006.01) E21B 7/28 (2006.01) E21B 17/10 (2006.01)

Patent

CA 2173870

A down reaming apparatus (10) has an upper stabilizer (146) which supports the down reaming apparatus (10) in the bored hole. A plurality of shoe assemblies (164) are radially attached to the hub of the upper stabilizer (146). The shoe assemblies (164) are biased against a bored shaft wall by pressurized cylinders (162) which allow limited return movement with resistance of the shoe assemblies (164). A weight assembly (90) comprising a plurality of stacked plates (16) is secured to the frame of the down reaming apparatus (10) and has manways (108) therethrough which allow passage of workers. A lower stabilizer (186) provides additional support for the down reaming apparatus (10). The lower stabilizer (186) also includes shoe assemblies (188) that are biased against the bored shaft wall by a pressurized cylinder (194).

L'invention concerne un appareil de reforage vertical (10) muni d'un stabilisateur supérieur (146) qui maintient ledit appareil de reforage vertical (10) dans le puits de forage. Des patins (164) sont fixés radialement au moyeu du stabilisateur. Les patins (164) sont sollicités contre la paroi du puits de forage par des vérins (162) sous pression qui n'autorisent qu'un mouvement limité du fait de la résistance exercée par les patins (164). Une gueuse (90) constituée d'un empilement de plaques (16) est fixée au bâti de l'appareil de reforage vertical (10). Elle est pourvue de trous d'homme (108) permettant le passage d'ouvriers. Un stabilisateur inférieur (186) confère un support supplémentaire audit appareil de reforage vertical (10). Le stabilisateur inférieur (186) est également muni d'un jeu de patins (188) sollicités contre la paroi du puits par des vérins (194) sous pression.

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