Method and apparatus for recovering viscous petroleum from thick

Wells – Processes – Distinct – separate injection and producing wells

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166245, 166 52, 166 57, E21B 4324

Patent

active

041203577

ABSTRACT:
Recovery of viscous petroleum such as from a thick tar sand formation is assisted using a closed-loop flow path formed in a production well extending from the earth's surface through a substantial portion of the formation for conducting hot fluid to reduce the viscosity of the petroleum in the formation to develop a first potential passage in the formation outside the flow path into which a hot drive fluid is injected through a injection well to promote movement of the petroleum to the production well for production and to develop a second potential passage for fluid flow in the formation from a linearly spaced apart injection well for injection of a hot drive fluid to further promote movement of additional petroleum to the production well.

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patent: 3608638 (1971-09-01), Terwilliger
patent: 3908763 (1975-09-01), Chapman
patent: 3994340 (1976-11-01), Anderson et al.
patent: 3994341 (1976-11-01), Anderson et al.
patent: 4008765 (1977-02-01), Anderson et al.

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