Water treatment following shale oil production by in situ...

E - Fixed Constructions – 21 – B

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E21B 43/00 (2006.01) E21B 41/02 (2006.01)

Patent

CA 2750405

A method for treating water at a water treatment facility is provided. In one aspect, the water has been circulated through a subsurface formation in a shale oil development area. The subsurface formation may comprise shale that has been spent due to pyrolysis of formation hydrocarbons. The method in one embodiment includes receiving the water at the water treatment facility, and treating the water at the water treatment facility in order to (i) substantially separate oil from the water, (ii) substantially remove organic materials from the water, (iii) substantially reduce hardness and alkalinity of the water, (iv) substantially remove dissolved inorganic solids from the water, and/or (v) substantially remove suspended solids from the water. The method may further includes delivering the water that has been treated at the water treatment facility re-injecting the treated water into the subsurface formation to continue leaching out contaminants from the spent shale.

L'invention concerne un procédé destiné à traiter de l'eau dans une installation de traitement d'eau. Dans un aspect, l'eau a été mise en circulation à travers une formation souterraine dans une zone d'exploitation d'huile de schiste. La formation souterraine peut comporter du schiste qui a été épuisé du fait de la pyrolyse des hydrocarbures de la formation. Dans un mode de réalisation, le procédé comporte les étapes consistant à recevoir l'eau au niveau de l'installation de traitement d'eau et à traiter l'eau au niveau de l'installation de traitement d'eau pour : (i) séparer sensiblement l'huile de l'eau, (ii) éliminer sensiblement les matières organiques présentes dans l'eau, (iii) réduire sensiblement la dureté et l'alcalinité de l'eau, (iv) éliminer sensiblement les solides inorganiques dissous dans l'eau et / ou (v) éliminer sensiblement les solides en suspension dans l'eau. Le procédé peut comporter en outre l'étape consistant à envoyer l'eau qui a été traitée au niveau de l'installation de traitement d'eau en la réinjectant dans la formation souterraine afin de continuer à évacuer les contaminants par lessivage du schiste épuisé.

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