Low temperature barriers for use with in situ processes

Details Low temperature barriers for use with in situ processes Low temperature barriers for use with in situ processes

E - Fixed Constructions

21

B

E21B 36/00 (2006.01)

Patent

CA 2606181

The invention provides systems for forming a freeze barrier around at least a portion of a subsurface treatment area, that includes: a plurality of freeze wells (114) , wherein at least one freeze wells positioned in the ground comprises a carbon steel canister (116) ; heat transfer fluid; and a refrigeration system configured to supply the heat transfer fluid to the freeze wells. The refrigeration system is configured to cool the heat transfer fluid to a temperature that allows the heat transfer fluid provided to a first freeze well to be in a range from -35 0C to -55 0C. The invention also provides methods to form and maintain the low temperature zone.

L~invention concerne des systèmes pour former une barrière de congélation autour d~au moins une partie d~une zone de traitement de subsurface, qui comprennent : une pluralité de puits de congélation (114), dont au moins l~un d~entre eux positionné dans le sol comprend une boîte filtrante en acier ordinaire (116) ; un fluide caloporteur ; et un système frigorifique configuré pour fournir le fluide caloporteur aux puits de congélation. Le système frigorifique est configuré pour refroidir le fluide caloporteur fourni à un premier puits de congélation à une température s~échelonnant entre -35 °C et -55 °C. L~invention fournit également des procédés pour former et maintenir la zone à basse température.

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