Down hole pressure intensifier and drilling assembly and method

E - Fixed Constructions – 21 – B

Patent

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E21B 7/18 (2006.01)

Patent

CA 2228477

A jet assisted drill system which uses a high pressure intensifier (18), positioned in a down hole drill assembly (10). Drill fluid from a drill stem (12) is directed into the drill assembly (10), and in one mode this drill fluid is passed through the pressure intensifier (18) to cause a piston assembly (28) of the intensifier (18) to reciprocate, with the high pressure pistons (34) of the piston assembly (28) delivering high pressure drill fluid to a discharge jet (68) in the drill bit assembly (14). The low pressure fluid which drives the low pressure pistons (32) is discharged into a downstream annular passageway (56) and to the drill bit assembly (14). In a by-pass mode, a selector valve (60) directs drill fluid from an upstream passageway portion (48) directly to a downstream main passageway portion (56) to pass out the drill bit assembly (14). There is a control valve (62) to operate the piston assembly (28) and a trigger valve (64) to direct fluids selectively to the control valve (62).

Système de forage assisté par jet utilisant un amplificateur (18) de haute pression positionné dans un ensemble (10) de forage de fond. La boue de forage provenant du train de tiges (12) est amenée dans l'ensemble de forage (10) et, dans l'un des modes de réalisation, elle est envoyée dans l'amplificateur de pression (18) de façon à imprimer un mouvement alternatif à un ensemble piston (28) de l'amplificateur (18), les pistons haute pression (34) de l'ensemble piston (28) amenant une boue de forage à haute pression à un jet de refoulement (68) dans l'ensemble trépan (14). La boue à basse pression qui actionne les pistons basse pression (32) est déversée dans un conduit annulaire aval (56) et dans l'ensemble trépan (14). Dans un mode de contournement, une soupape de sélection (60) dirige la boue de forage provenant d'une partie de passage amont (48) directement dans une partie de passage aval (56) de façon à la faire sortir de l'ensemble trépan (14). Une vanne de régulation (62) actionne l'ensemble piston (28) et une vanne de déclenchement (64) pour diriger les boues sélectivement vers la vanne de régulation (62).

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