Method and apparatus for producing tar sand deposits containing

Wells – Processes – Electric current or electrical wave energy through earth for...

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166 50, 166 60, 166245, 166272, E21B 4324, E21B 4330

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active

050425790

ABSTRACT:
An apparatus and method are disclosed for producing thick tar sand deposits by preheating of thin, relatively conductive layers which are a small fraction of the total thickness of a tar sand deposit, with horizontal electrodes. The preheating is continued until the viscosity of the tar in a thin preheated zone adjacent to the conductive layers 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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