04037655 is referenced by 139 patents and cites 9 patents.

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.

Title
Method for secondary recovery of oil
Application Number
228846
Publication Number
4037655
Application Date
October 21, 1975
Publication Date
July 26, 1977
Inventor
Neil L Carpenter
Kerrville
TX, US
Agent
Bard Springs Jackson & Groves
Assignee
Electroflood Company
TX, US
IPC
E21B 43/24
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