Equipment and method for reinforcing a borehole of a well...

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 33/138 (2006.01)

Patent

CA 2757650

The equipment for drilling and reinforcing a borehole (1) of a well comprises a drill pipe string (5) carrying a drill tool (7) at its lowermost end and a downhole treatment device (19) held on the drill pipe string (5) for applying a liner (17) of polymer material at the surface of the borehole (1). The polymer material is a fusible and/or curable material dissolved and/or emulsified and/or dispersed in drilling fluid (9) or mud circulated through the drill pipe string (5) and an an-nulus between the drill pipe string (5) and the wall (15) of the borehole (1). The treatment device (19) is adapted to concentrate energy for fusing and/or curing the polymer material contained in the drilling fluid (9) in a limited space (25) at the vicinity of the wall (15) of the borehole (1). The treatment device (19) thus focuses its energy in the vicinity of the wall (15) and allows a continu-ous reinforcing of the borehole (1) simultaneously while drilling.

L'invention porte sur un équipement pour le forage et le renforcement d'un trou de forage (1) d'un puits, lequel équipement comprend un train de tiges de forage (5) portant un outil de forage (7) à son extrémité la plus inférieure et un dispositif de traitement de fond de trou (19) maintenu sur le train de tiges de forage (5) pour l'application d'une colonne perdue (17) en un matériau polymère à la surface du trou de forage (1). Le matériau polymère est un matériau fusible et/ou durcissable, dissous et/ou en émulsion et/ou dispersé dans un fluide de forage (9) ou dans une boue qui circule à travers le train de tiges de forage (5) et un anneau entre le train de tiges de forage (5) et la paroi (15) du trou de forage (1). Le dispositif de traitement (19) est apte à concentrer une énergie pour la fusion et/ou le durcissement du matériau polymère contenu dans le fluide de forage (9) dans un espace limité (25) au voisinage de la paroi (15) du trou de forage (1). Le dispositif de traitement (19) concentre ainsi son énergie au voisinage de la paroi (15) et permet un renforcement continu du trou de forage (1) simultanément lors du forage.

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