| 摘要 |
A method for recovery of petroleum deposits, particularly those deposits which are underlain by a water zone, which method includes the steps of introducing a dissolving gas product into an upper region of a petroleum deposit to enable gravity head build-up of more soluble petroleum products which then flow downward toward a recovery zone for delivery to a surface recovery unit. The method is particularly adaptable for utilization with a single well-bore whereupon a dissolving injection gas can be introduced down an outer annulus of the pipe string while recovered petroleum can be withdrawn from a lower recovery zone for conduction up a tubing string or such to the earth's surface. An inert gas introduced through another bore into upper regions of the deposit serves to maintain proper pressure balance throughout the system.
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