Process for in situ decontamination of subsurface soil and...

E - Fixed Constructions – 21 – B

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E21B 43/24 (2006.01) B09C 1/00 (2006.01) B09C 1/02 (2006.01) B09C 1/06 (2006.01) E02D 3/11 (2006.01)

Patent

CA 2039148

A method is provided for in situ decontamination of contaminated subsurface area by injection of steam into injection wells and withdrawing liquids and vapors from extraction wells under subatmospheric pressure whereby steam is passed through the contaminated area in an essentially horizontal direction. After a substantial portion of the contamination has been removed in this manner, the injection of steam is ceased, but the extraction at subatmospheric pressure is continued, to volatilize and remove the residual water and contaminants trapped in the pores of the soil. The steam injection may be periodically resumed to reheat the area and to replenish the water in the pores.

Méthode pour la décontamination in situ de la couche contaminée de sol situé sous la surface par l'injection de vapeur dans des puits d'injection (40a, 40b) et par l'extraction des liquides et des vapeurs issus de ces puits d'extraction (41), dans des conditions de pression subatmosphérique par lesquelles la vapeur traverse la zone contaminée suivant une direction essentiellement horizontale. Après avoir enlevé de la sorte une partie substantielle de la contamination, on arrête d'injecter de la vapeur mais on continue l'extraction dans des conditions de pression subatmosphérique, pour volatiliser et enlever l'eau résiduelle et les agents de contamination enfermés dans les espaces intersticiels du sol. Périodiquement, on peut reprendre l'injection de vapeur pour réchauffer la zone et remplir les espaces intersticiels du sol.

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