Distance holder with helical slot

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 7/18 (2006.01) E21B 21/00 (2006.01)

Patent

CA 2680454

A distance holder (1) for connection to, and rotation with, a drill string in an earth formation drilling device arranged to supply a jet of abrasive fluid for the purpose of providing a borehole (4) by removing earth formation material through abrasion, comprises a housing with a chamber (13) which is essentially rotational symmetric and which is to face the earth formation material, and a jet nozzle (10) which arranged for discharging a jet of the abrasive fluid in said chamber, said housing comprising at least one slot (18) for allowing the abrasive fluid to leave the chamber. The slot is continued over the housing outer surface so as to counteract rolling motions of the particles which are comprised in the abrasive fluid.

L'invention concerne une pièce d'écartement (1) destinée à être raccordée et à pivoter avec un train de tiges de forage dans un dispositif de forage de formation terrestre, qui est disposée de manière à produire un jet de fluide abrasif pour constituer un trou de forage (4) en éliminant le matériau de formation terrestre par abrasion, et qui comprend un boîtier équipé d'une chambre (13) qui est esssentiellement à symétrie de révolution et qui est opposée au matériau de formation terrestre, ainsi qu'une buse (10) disposée pour libérer un jet du fluide abrasif dans ladite chambre, ledit boîtier comportant au moins une fente (18) pour permettre au fluide abrasif d'être libéré de la chambre. Le fente se prolonge sur la surface extérieure du boîtier de manière à réagir aux mouvements de roulis des particules contenues dans le fluide abrasif.

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