E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 33/124 (2006.01) E21B 34/06 (2006.01) E21B 34/10 (2006.01) E21B 43/26 (2006.01)
Patent
CA 2474518
A collar (500) for injecting fluid, such as a formation treating fluid, into a wellbore, and a method for using same. The collar is disposed between the upper and lower packing elements (40, 41) of a pack-off system during the treatment of an area of interest within a wellbore. The collar first comprises an inner mandrel (550) running essentially the length of the collar. The inner bore of the collar is in fluid communication with the annular region between the collar and the surrounding perforated casing by a set of actuation ports (552). A second set of ports (554), known as frac ports, is disposed within the mandrel. In accordance with one aspect of the invention, the collar further comprises a tubular case which substantially seals the frac ports in a first position, and slidably moves along the outer surface of the mandrel in order to expose the frac ports in a second position. In operation, the upper and lower packing elements are set at a first fluid pressure level. Upon application of a second greater fluid pressure level, the upper and lower packing elements are further separated in accordance with a designed stroke length, thereby exposing the frac ports.
L'invention concerne un collier (500) utilis~ pour injecter un fluide, tel qu'un fluide de traitement de formation, dans un puits de forage, et son proc~d~ d'utilisation. Le collier est plac~ entre l'~l~ment de garnissage sup~rieur et l'~l~ment de garnissage inf~rieur (40, 41) du systme de garniture, pendant le traitement d'une zone d'int~rÚt situ~e ~ l'int~rieur d'un puits de forage. Ledit collier comprend d'abord un mandrin int~rieur (550) qui s'~tend sensiblement sur la longueur du collier. Le trou int~rieur du collier est en communication fluidique avec la r~gion annulaire situ~e entre le collier et le tubage perfor~ qui l'entoure, par l'interm~diaire d'un ensemble d'orifices d'actionnement (552). Une second ensemble d'orifices (554), connus sous le nom d'orifices de fracturation, se trouve ~ l'int~rieur du mandrin. Pendant le fonctionnement, l'~l~ment de garnissage sup~rieur et l'~l~ment de garnissage inf~rieur sont r~gl~s ~ un premier niveau de pression de fluide. Lors de l'application d'un second niveau de pression de fluide, sup~rieur au premier, l'~l~ment de garnissage sup~rieur et l'~l~ment de garnissage inf~rieur sont encore plus s~par~s selon une course d~termin~e, ce qui a pour r~sultat la mise ~ nu des orifices de fracturation.
Giroux Richard L.
Hoffman Corey E.
Ingram Gary D.
Marks & Clerk
Weatherford/lamb Inc.
LandOfFree
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