Arrangement for recovering viscous petroleum from thick tar sand

摘要: An arrangement is provided for recovering viscous oil from a tar sand formation having large vertical dimension including substantially lined shaft extending through the formation. A first opening formed in lower portion of lining and at least one lateral hole extends into hole. plurality tubular members are positioned to provide both closed loop flow path fluid out contact with separate production fluids shaft. steam source connected forming path. second injection conduit The injecting