Sliding sleeve assembly for subsurface flow control

Details Sliding sleeve assembly for subsurface flow control Sliding sleeve assembly for subsurface flow control

E - Fixed Constructions

21

B

E21B 34/14 (2006.01) E21B 21/10 (2006.01) E21B 34/00 (2006.01) E21B 34/06 (2006.01) E21B 34/16 (2006.01)

Patent

CA 2371429

Two sliding sleeves (14 and 20) are carried in a tubular pipe assembly (10) for controlling the opening and closing of flow passages (12) through the pipe wall (13). The assembly (10) is placed at the lower end of a tubing string to regulate the flow of fluid from the string into a subsurface well formation. The first sleeve (14) extends between upper and lower seals (15 and 16) disposed above and below the flow passage (12) to close the flow passages (12) to flow. A shifting tool, operated from the well surface, moves the sleeve (14) axially down the assembly (10) to open the flow passages (12), leaving the upper seal (15) exposed. A shifting tool then moves the second sleeve (20) axially down the assembly (10) to cover the exposed seal (15). Fluid pumped through the assembly (10) exits through the flow passages (12) without having to flow through radial flow passages in the sliding sleeve. The two sleeve sections (14 and 20) protect the upper and lower seals (15 and 16) and sealing surfaces from fluid erosion.

L'invention concerne deux manchons coulissants (14 et 20) acheminés dans un ensemble (10) tuyau tubulaire afin de commander l'ouverture et la fermeture de passages (12) à travers la paroi (13) du tuyau. L'ensemble (10) est placé à l'extrémité inférieure d'une colonne afin de réguler le débit fluidique entre la colonne et une formation souterraine. Le premier manchon (14) s'étend entre des joints supérieur et inférieur (15 et 16) placés au dessus et au dessous des passages (12) de manière à fermer lesdits passages (12) lors de l'écoulement. Un outil de ripage, manipulé depuis la surface du puits, fait descendre le manchon (14), de manière axiale à l'ensemble (10) afin d'ouvrir les passages (12), laissant le joint supérieur (15) à découvert. Puis, un outil de ripage fait descendre le second manchon (20), de manière axiale à l'ensemble (10) afin de recouvrir le joint (15) à découvert. Le fluide pompé à travers l'ensemble (10) est évacué par les passages (12) sans s'écouler à travers les passages périphériques dans le manchon coulissant. Les deux manchons (14 et 20) protègent le joint supérieur (15), le joint inférieur (16) et les surfaces d'étanchéité contre l'érosion fluidique.

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