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Multiple drain method for recovering oil from tar sand | 2001-07-24 | Patent; Thermal method; Immobile hydrocarbon oil; Subsurface tar sand deposit; Bore holes | A thermal method is described for recovering normally immobile hydrocarbon oil from a subsurface tar sand deposit. The procedure comprises: (a) establishing at least one substantially vertical production bore hole extending from the surface of the earth to at least the bottom of said subsurface form... |
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