Apparatus and method for open hole gravel packing

E - Fixed Constructions – 21 – B

Patent

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E21B 43/04 (2006.01)

Patent

CA 2338431

The present invention provides apparatus and method for gravel packing open holes wherein hydrostatic pressure is maintained above the formation pressure ("overburdened condition") throughout the gravel pack process. The apparatus includes a completion string which contains a flow restriction device, a crossover device and a packer each above and below the crossover device. The string is set in the wellbore with the flow restriction device adjacent the producing formation. The upper packer and the crossover device are set, which allows the gravel fluid to pass to the annulus, and return through the string. After gravel packing, the lower packer is set. The crossover device and the upper packer are retrieved from the wellbore leaving the flow restriction device and the lower packer in the wellbore. The system maintains the wellbore under overburdened condition throughout the gravel packing process.

La présente invention concerne un appareil et un procédé de gravillonnage des crépines à découvert, dans lequel la pression hydrostatique est maintenue au-dessus de la pression de formation ("état géostatique") tout au long du processus de gravillonnage. L'appareil inclut une tige de complétion contenant un dispositif restricteur de débit, un dispositif de raccord, et un packer au-dessus et au-dessous du dispositif de raccord. La tige est installée dans le puits avec le dispositif restricteur de débit jouxtant la formation de production. Le packer supérieur et le dispositif de raccord sont mis en place de manière à laisser le fluide passer du gravier à l'annulaire puis retourner à travers la tige. Après gravillonnage des crépines, le packer inférieur est mis en place. Le dispositif de raccord et le packer supérieur sont retirés du puits et le dispositif restricteur de débit et le packer inférieur sont laissés en place dans le puits. Le système maintient le puits dans un état géostatique pendant tout le processus de gravillonnage des crépines.

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