Thermal injection process for recovery of heavy viscous petroleu

Details Thermal injection process for recovery of heavy viscous petroleu Thermal injection process for recovery of heavy viscous petroleu

1975-07-14

1976-04-06

Novosad, Stephen J.

Wells

Processes

Heating, cooling or insulating

E21B 4324

Patent

active

039483231

ABSTRACT:
A new and improved process for the recovery of heavy viscous petroleum from a subterranean formation is disclosed. A heated fluid comprising steam and a heated non-condensable gas is injected into the formation through a penetrating well at an initial predetermined injection rate until the injection rate diminishes to a predetermined level. The injection is then discontinued and a heated non-condensable gas is immediately injected into the formation through the well until the injection rate thereof reaches a desired level. The steam-gas mixture and heated non-condensable gas are then alternately injected in sequence until the steam-gas mixture can be injected into the formation continuously at a desired injection rate and the formation and petroleum have been heated to a predetermined extent. The heated, mobile petroleum is then recovered by withdrawal through the well in a conventional manner. The process is particularly useful for the recovery of heavy viscous petroleum from a formation having low permeabilities to oil and water.

REFERENCES:
patent: 2173556 (1939-09-01), Hixon
patent: 2823752 (1958-02-01), Walter
patent: 2839141 (1958-06-01), Walter
patent: 3360044 (1967-12-01), Lange
patent: 3385360 (1968-05-01), Smith
patent: 3425492 (1969-02-01), Gilchrist
patent: 3480081 (1969-11-01), Felsenthal et al.
patent: 3499490 (1970-03-01), Needham et al.
patent: 3789470 (1974-01-01), West et al.

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