Novel fluids and techniques for matrix acidizing

C - Chemistry – Metallurgy – 09 – K

Patent

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C09K 8/86 (2006.01) C09K 8/72 (2006.01)

Patent

CA 2352827

Liquids comprised solely of anions and cations ("ionic liquids") are disclosed as novel components of fluids (and techniques relying upon those fluids) for stimulation of hydrocarbon wells. In particular, the fluids disclosed are useful in matrix acidizing. Formation of the ionic liquids of the present Invention is highly exothermic, hence the heat generated can be used, for instance, to melt de-watered drilling fluid in the near-wellbore region of the formation. Further, reaction of the ionic liquids with water results in acid generation; this acid can be used to, for instance, to stimulate a formation, either by conventional matrix acidizing or fracture acidizing. In addition, certain preferred species of the ionic liquids of the present Invention are highly stable solvents, hence they can be used as carrier fluids for highly reactive super acids (e.g., SbF5 + HF) in connection with matrix acidizing.

L'invention concerne des liquides comprenant seulement des anions et des cations (<= fluides ioniques >=) utilisés en tant que nouveaux composants de fluides (et techniques faisant appel à ces fluides) pour la stimulation de puits d'hydrocarbures. Ces fluides sont utiles en particulier pour l'acidification matricielle. La formation des liquides ioniques de l'invention est hautement exothermique. Ainsi, par exemple, on peut utiliser la chaleur dégagée pour faire fondre le fluide de forage exempt d'eau dans la zone située à proximité du puits de la formation. De plus, la mise en réaction des liquides ioniques avec de l'eau permet de produire de l'acide. On peut utiliser cet acide, par exemple, pour stimuler une formation, au moyen de techniques d'acidification matricielle conventionnelles ou d'acidification avec fracturation. En outre, certains types préférés des liquides ioniques de l'invention sont des solvants hautement stables, qui peuvent être utilisés en tant que fluides porteurs destinés à des super acides réactifs (par exemple, SbF¿5? + HF), dans le cadre d'une acidification matricielle.

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