Methods and apparatus for enhanced recovery of viscous deposits

Details Methods and apparatus for enhanced recovery of viscous deposits Methods and apparatus for enhanced recovery of viscous deposits

1996-11-27

1998-10-06

Dang, Hoang C.

Wells

Processes

Heating, cooling or insulating

166 57, 166 67, E21B 4324, E21B 3600

Patent

active

058163255

ABSTRACT:
Method and apparatus for enhanced recovery of subterranean deposits. A heating fluid circulates in a concentric tubing assembly which attaches to a downhole heat exchanger. A convertible fluid descends to the downhole heat exchanger in the concentric tubing assembly where it converts to vapor by transfer of heat from the heating fluid. The vapor can then be used to liquefy viscous subterranean deposits. A feed control valve controls the rate at which convertible fluid enters the downhole heat exchanger. Scale produced by the vaporization of the convertible fluid is purged by a purging valve into the well sump.

REFERENCES:
patent: 2914124 (1959-11-01), Ripley, Jr.
patent: 4083404 (1978-04-01), Allen
patent: 4372386 (1983-02-01), Rhodes et al.
patent: 4378846 (1983-04-01), Brock
patent: 4641710 (1987-02-01), Klinger
patent: 4678039 (1987-07-01), Rivas et al.
patent: 5085275 (1992-02-01), Gondouin

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