Recovery of bitumen from tar sands

Details Recovery of bitumen from tar sands Recovery of bitumen from tar sands

1975-06-06

1977-02-15

Novosad, Stephen J.

Wells

Processes

Distinct, separate injection and producing wells

166 52, E21B 704, E21B 4324

Patent

active

040077888

ABSTRACT:
A method of recovering bitumen from a subterranean tar sand formation characterized by a plurality of steps. First, a continuous wellbore having a second section thereof contained within the formation and first and third sections thereof extending the second section to the earth's surface is formed. Next, the first and third sections of the wellbore are cased. Thereafter, a heated fluid is circulated through the wellbore contacting the formation to reduce the viscosity of the bitumen contained therein rendering the bitumen mobile. Subsequently, bitumen mobilized by the heated fluid is recovered via the wellbore.

REFERENCES:
patent: 2271005 (1942-01-01), Grebe
patent: 2584605 (1952-02-01), Merriam et al.
patent: 2778603 (1957-01-01), McCune et al.
patent: 2974937 (1961-03-01), Kiel
patent: 3285350 (1966-11-01), Henderson
patent: 3338306 (1967-08-01), Cook
patent: 3386508 (1968-06-01), Bielstein et al.
patent: 3933447 (1976-01-01), Pasini et al.

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