A drilling hole system

Details A drilling hole system A drilling hole system

E - Fixed Constructions

21

B

E21B 4/00 (2006.01) E21B 7/04 (2006.01) E21B 19/20 (2006.01)

Patent

CA 2214551

26 "A DRILLING HOLE SYSTEM" In the names of GAZ DE FRANCE and POWERDRILL FRANCE A drilled hole (1) is produced by means of a drilling rod assembly comprising a succession of rod elements (7d) to be arranged end to end. For this purpose, a vertical shaft (2) is produced in the ground, of constant horizontal section and preferably insufficient for a man to be able to work towards the bottom of it, the rod assembly is displaced therein from an opening located in a front wall of the shaft, and the elements (7) of the rod assembly are selected so that they have an axial length less than the distance separating the said opening in the front wall of the shaft from the opposite rear wall.

"SYSTÐME POUR TROU DE FORAGE" au nom de GAZ DE FRANCE et POWERDRILL FRANCE. Un trou de forage (1) est produit au moyen d'une colonne de forage constituée d'une série d'éléments de tige (7d) s'assemblant bout à bout. A cette fin, on creuse un puits vertical (2) dans le sol, de section horizontale constante et, de préférence, trop petite pour permettre à un homme d'y descendre, la tige s'y déplaçant à partir d'une ouverture pratiquée dans la paroi avant du puits, et les éléments (7) de la tige étant choisis de manière à avoir une longueur axiale inférieure à la distance entre ladite ouverture dans la paroi avant du puits et la paroi arrière opposée.

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