Method for secondary recovery of oil

Details Method for secondary recovery of oil Method for secondary recovery of oil

1975-10-21

1977-07-26

Novosad, Stephen J.

Wells

Processes

Electric current or electrical wave energy through earth for...

166245, 166 60, 166272, 166303, E21B 4324

Patent

active

040376559

ABSTRACT:
In one exemplar embodiment, method and apparatus include providing an electrode disposed in a plurality of vertically spaced boreholes penetrating the formation. The plurality of electrodes in contact with the salt water and oil of the formation are connected to a source of electrical power for establishing an AC electrical field of current flow between the spaced elctrodes. The electrodes are insulated from the earth structure surrounding the borehole for preventing an electrical current path between the electrodes and the earth structure for isolating the electrical current path from the electrode into the formation. The AC electrical current path through the formation generates volumes of free hydrogen in the formation where it is trapped for increasing the formation pressure. The increased pressure of the formation will drive the oil into producing boreholes spaced from the electrode boreholes.

REFERENCES:
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patent: 2799641 (1957-07-01), Bell
patent: 3507330 (1970-04-01), Gill
patent: 3518036 (1970-06-01), Staats et al.
patent: 3547193 (1970-12-01), Gill
patent: 3605888 (1971-09-01), Crowson et al.
patent: 3620300 (1971-11-01), Crowson
patent: 3782465 (1974-01-01), Bell et al.
Composite Catalog of Oil Field Equipment & Services, 25th Rev., 1962-1963, vol. 1, pp. 197, 1521, World Oil, Houston, Texas.
Muskat, "Physical Principles of Oil Production", 1st Edition, 1949, McGraw-Hill Book Co., Inc. N.Y., N.Y.

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