Apparatus and method for injecting treatment fluids into an...

E - Fixed Constructions – 21 – B

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E21B 33/124 (2006.01) C09K 8/72 (2006.01) E21B 33/138 (2006.01) E21B 43/02 (2006.01) E21B 43/25 (2006.01) E21B 43/27 (2006.01)

Patent

CA 2315024

A tool and method are disclosed for injecting various treatment fluids into a formation surrounding an underground borehole. The tool (1) comprises at least three axially spaced swab assemblies (7, 8, 9) which define at least two annular spaces (10, 11) between the tool body (5) and the wellbore (12). In use the tool (1) is moved through the wellbore (12) whilst a first treatment fluid (18) such as a sand consolidation agent or production stimulation chemical is pumped via a first annular space (10) into the formation (16) and a second treatment fluid (19), such as an overflush fluid, is pumped via a second annular space (11) into the formation (16). The tool (1) allows accurate and continuous injection of various treatment fluids over long intervals into the formation (16) without requiring cycling to new fluids.

L'invention concerne un outil et un procédé pour l'injection de divers fluides de traitement dans une formation entourant un trou de forage souterrain. Ledit outil (1) comporte au moins trois ensembles tampons (7, 8, 9) espacés dans le sens axial, qui définissent au moins deux espaces annulaires (10, 11) entre le corps d'outil (5) et le trou de forage (12). Pour l'utiliser, on déplace l'outil (1) dans le trou de forage (12) alors qu'un premier fluide de traitement (18) tel qu'un agent de consolidation du sable ou un produit chimique de simulation de production, est pompé dans la formation (16), à travers un premier espace annulaire (10), et un deuxième fluide de traitement (19), tel qu'un fluide formant bouchon de queue, est pompé dans la formation (16), à travers un deuxième espace annulaire (11). Ledit outil (1) permet l'injection précise et continue dans la formation, de divers fluides de traitement sur des longues périodes, sans que la remise en circulation de nouveaux fluides soit nécessaire.

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