A method of scale dissolution in a formation containing...

E - Fixed Constructions – 21 – B

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E21B 37/00 (2006.01) C09K 8/528 (2006.01) E21B 37/06 (2006.01) E21B 43/28 (2006.01)

Patent

CA 2174770

A method to improve the efficiency of scale dis- solution in a formation containing multiple productive intervals (20, 22, 24, 26) where variable density liq- uids are utilized. Initially, a liquid composition suf- ficient to solubilize an alkaline-earth metal sulphate scale deposit is directed into a wellbore (10) thereby contacting scale in one productive interval of the for- mation. Thereafter, a second scale solubilizing liquid having a density less than the first liquid is directed into the wellbore (10) thereby contacting additional perforations (14) and a higher interval. These scale solubilizing liquids with varying densities are allowed to remain in contact with perforations (14) and produc- tive intervals (20, 22, 24, 26) communicating there- with for a time sufficient to solubilize the scale de- posit thereby efficiently removing said scale deposit from perforations (14) and productive intervals (20, 22, 24, 26) at two different levels.

Procédé permettant d'améliorer l'efficacité de dissolution du tartre dans une formation contenant des intervalles productifs multiples (20, 22, 24, 26) où sont utilisés des liquides de densité variable. En premier lieu, une composition liquide permettant de solubiliser un dépôt de tartre de sulphate métallique alcalino-terreux est injectée dans un trou de forage (10) pour entrer en contact avec le tartre ou dans un intervalle de production de la formation. Ensuite, un second liquide de solubilisation des dépôts, d'une densité inférieure à celle du premier liquide, est injecté dans le trou de forage (10) entrant ainsi en contact avec des perforations supplémentaires (14) et un intervalle plus élevé. Ces liquides de solubilisation des dépôts ou tartre ayant des densités différentes peuvent rester en contact avec les perforations (14) et les intervalles de production (20, 22, 24, 26) et communiquent avec eux pendant un temps suffisamment long pour solubiliser les dépôts et enlever les dépôts des perforations (14) et des intervalles de production (20, 22, 24, 26) à deux niveaux différents.

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