Solution mining systems and methods for treating hydrocarbon...

E - Fixed Constructions – 21 – B

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E21B 43/241 (2006.01) E21B 43/28 (2006.01)

Patent

CA 2626972

Methods for treating a hydrocarbon containing formation prior to the use of an in situ heat treatment process to produce hydrocarbons from the formation include providing a first fluid comprising heated water or steam to a portion of the formation, wherein the first fluid is initially at a temperature below a dissociation temperature of nahcolite in the formation,- producing a second fluid from the portion, wherein the second fluid comprises nahcolite; providing heat from one or more heaters to the formation to heat the formation; and producing hydrocarbon fluids from the formation. As the solution mining progresses, the first fluid temperature may be increased so that the temperature of the first fluid that reaches nahcolite is below the dissocation temperature and so that the temperature of the first fluid is below a pyrolysis temperature of hydrocarbons in the formation.

L~invention concerne des procédés de traitement d~une formation contenant des hydrocarbures avant l'utilisation d'un procédé de traitement thermique in situ pour obtenir des hydrocarbures à partir de la formation, lesdits procédés consistant à introduire un premier fluide comprenant de la vapeur ou de l~eau chauffée dans une partie de la formation, ledit premier fluide étant initialement à une température inférieure à une température de dissociation de la nahcolite dans la formation, à extraire un second fluide de cette partie de la formation, ledit second fluide comprenant de la nahcolite ; à transférer de la chaleur à partir d~un ou de plusieurs dispositifs de chauffage vers la formation afin de la chauffer ; et à extraire des fluides hydrocarbonés de la formation. Au fur et à mesure de la progression de l~exploitation par dissolution, la température du premier fluide peut être augmentée de manière à ce que la température du premier fluide atteignant la nahcolite soit inférieure à la température de dissociation et à ce que la température du premier fluide soit inférieure à la température de pyrolyse des hydrocarbures de la formation.

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