Dehydrating treatment of oil and gas wells

E - Fixed Constructions – 21 – B

Patent

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E21B 43/32 (2006.01) C09K 8/594 (2006.01) C09K 8/528 (2006.01)

Patent

CA 2672031

Water is removed from passages in a subterranean hydrocarbon formation by feeding into the passages a composition comprising 5 to 70 wt. % of alkanol(s) having 1 to 3 carbon atoms and 30 to 95 wt. % dense phase carbon dioxide, under a pressure greater than zero up to 25,000 psig and at a temperature of 0°F to 200°F, allowing the feed composition to remain in the well, whereby the feed composition solubilizes with said water in said passages, and then removing from said well a liquid product composition comprising said solubilized water and alkanol.

L'invention concerne un traitement permettant d'éliminer l'eau des passages pratiqués dans des formations souterraines d'hydrocarbures en amenant dans lesdits passages une composition comportant 5 à 70 % en poids d'acalnol(s), 1 à 3 atomes de carbone et 30 à 95 % en poids de dioxyde de carbone à phase dense, sous une pression supérieure à zéro allant jusqu'à 25 000 psig et à une température de 0 °F à 200 °F. Ces conditions permettent à la composition de rester dans le puits et de se solubiliser avec l'eau. La composition de produit liquide comprenant l'eau solubilisée et l'alcanol est ensuite éliminée dudit puits.

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