Wells – Processes – Heating – cooling or insulating
Patent
1986-04-16
1987-03-10
Novosad, Stephen J.
Wells
Processes
Heating, cooling or insulating
166 67, 166242, 166269, E21B 4324
Patent
active
046484558
ABSTRACT:
Apparatus for injecting high-temperature steam at a selected mass flow rate into a plurality of vertically spaced production formations of a subterranean well comprises a plurality of choke devices connected in series relationship in a tubing string extending to the well surface. Each choke device is positioned immediately above or adjacent to a production formation and defines a flow diversion device which extracts a predetermined portion of steam flow from the main steam flow, moving downwardly through the tubing string and directs such diverted steam portion into the inlet chamber of a Venturi passage. The steam is accelerated by the Venturi passage to its critical mass flow rate and is discharged into the production formation. In a preferred embodiment of the invention, the Venturi passage is connected in series with a fluid mixing apparatus which effects an intimate mixture of vapor and water components of the steam. A Venturi passage may also be incorporated in the steam supply line connected between the source of steam and the tubing string of the particular well.
REFERENCES:
patent: 1439560 (1922-12-01), Lee
patent: 2227539 (1941-01-01), Dorton
patent: 2611436 (1952-09-01), Carr et al.
patent: 2973039 (1961-02-01), Payne, Jr.
patent: 3422893 (1969-01-01), Warren
patent: 3455382 (1969-07-01), Chenoweth
patent: 4058164 (1977-11-01), Stoddard et al.
Baker Oil Tools, Inc.
Novosad Stephen J.
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