Method of producing a tar sand deposit containing a...

Details Method of producing a tar sand deposit containing a... Method of producing a tar sand deposit containing a...

B - Operations, Transporting

03

B

196/14, 309/6

B03B 9/02 (2006.01) E21B 36/04 (2006.01) E21B 43/24 (2006.01)

Patent

CA 2027105

A method is disclosed fox producing thick tar sand deposits by preheating of a thin, relatively conductive layer (26) which are a small fraction of the total thickness of a tar sand deposit. The thin conductive layer (26) serve to confine the heating within the tar sands to a thin zone adjacent to the conductive layer (26) even for large distances between rows of electrodes (10). The preheating is continued until the viscosity of the tar in a thin preheated zone adjacent to the conductive layer (26) is reduced sufficiently to allow steam injection into the tar sand deposit. The entire deposit is then produced by steam flooding.

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