Method of producing tar sand deposits containing conductive laye

Details Method of producing tar sand deposits containing conductive laye Method of producing tar sand deposits containing conductive laye

1989-10-10

1990-05-22

Suchfield, George A.

Wells

Processes

Electric current or electrical wave energy through earth for...

166 60, 166245, 166272, E21B 4324

Patent

active

049269410

ABSTRACT:
A method is 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. The thin conductive layers serve to confine the heating within the tar sands to a thin zone adjacent to the conductive layers even for large distances between rows of 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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