Combined development of oil shale by in situ heating with a...

E - Fixed Constructions – 21 – B

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E21B 43/14 (2006.01) E21B 36/00 (2006.01) E21B 36/04 (2006.01) E21B 43/24 (2006.01)

Patent

CA 2664321

A method for producing hydrocarbons from subsurface formations at different depths is first provided. In one aspect, the method includes the step of heating organic-rich rock, in situ, within a subsurface formation at a first depth. The result of the heating step is that at least a portion of the organic-rich rock is pyrolyzed into hydrocarbon fluids. Preferably, the organic-rich rock of the subsurface formation of the first depth is oil shale. The method also includes providing at least one substantially unheated zone within the formation of the first depth. In this way, the organic-rich rock in that zone is left substantially unpyrolyzed. The method further includes drilling at least one production well through the unheated zone, and completing the at least one production well in a subsurface formation at a second depth that is deeper than the first depth.

La présente invention concerne un procédé de production d'hydrocarbures à partir de formations souterraines à différentes profondeurs. Dans un aspect, le procédé comporte une opération de chauffage in situ de roche riche en matières organiques, à l'intérieur d'une formation souterraine à une première profondeur. Le chauffage aboutit à une pyrolyse au moins partielle de la roche riche en matières organiques, donnant des fluides d'hydrocarbures. De préférence, la roche riche en matières organiques de la formation souterraine de la première profondeur est du schiste bitumineux. Le procédé consiste également à ménager au moins une zone sensiblement non chauffée à l'intérieur de la formation de la première profondeur. Cela fait que la roche riche en matières organiques dans cette zone reste sensiblement non pyrolysée. Le procédé consiste en outre à forer au moins un puits de production au travers de la zone non chauffée, et à pousser ce puits de production jusque dans une formation souterraine à une deuxième profondeur plus profonde que la première profondeur. Il ne reste plus qu'à produire les fluides d'hydrocarbures au travers du puits de production considéré.

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