Backhead and drill assembly with backhead

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 4/14 (2006.01) E21B 1/38 (2006.01)

Patent

CA 2627488

In representative embodiments, a backhead for a drill assembly comprises an elongate member having a proximal end connectible to a source of pressurized fluid, a side wall defining an axial bore and an open distal end. A portion of the bore extending proximally from the distal end has an inner surface defining a cylinder portion shaped to receive an axially movable piston. The axial bore also comprises a check valve receiving area shaped to receive a check valve and to separate, during normal operation when a check valve is received in the check valve receiving area, an inlet area extending proximally to the proximal end from the cylinder portion extending distally to the distal end. Various improvements in retaining the distributor and increasing flow efficiency are described.

Dans des modes de réalisation représentatifs, une tête postérieure pour un ensemble de forage comporte un organe allongé ayant une extrémité proximale pouvant être connectée sur une source de fluide sous pression, une paroi latérale définissant un alésage axial et une extrémité distale ouverte. Une partie de l~alésage s~étendant de manière proximale à partir de l~extrémité distale a une surface intérieure définissant une partie de cylindre dont la forme permet de recevoir un piston axialement mobile. L~alésage axial comporte aussi une zone de réception de clapet antiretour dont la forme permet de recevoir un clapet antiretour et de séparer, en cours de fonctionnement normal quand un clapet antiretour est reçu dans la zone de réception de clapet antiretour, une zone d~admission s~étendant de manière proximale jusqu~à l~extrémité proximale de la partie cylindre s~étendant de manière distale jusqu~à l~extrémité distale. Diverses améliorations concernant la retenue du distributeur et l~augmentation de l~efficacité du débit sont décrites.

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