CPC E21B 43/16 (2013.01) [E21B 43/2401 (2013.01)] | 20 Claims |
1. A method for improved oil recovery by action of an electric field of a direct current and a pulsating electromagnetic field on an oil layer (6) within reservoir rock beneath a ground surface, wherein the method comprises:
a) selecting submerged reservoir rock formation clusters that contain oil within the oil layer;
b) selecting one or more boreholes;
c) extracting oil from at least one borehole of the one or more boreholes;
the method further comprises the following steps:
A. connecting an electrode (7, 8) with a source of the direct current (1), whereby the electrode comprises at least one of a steel casing (17) and upstream production tubing (16) of the one or more boreholes;
B. connecting of the source of the direct current (1) with a source of the pulsating electromagnetic field (2), wherein the source of the pulsating electromagnetic field (2) is situated on the ground surface;
C. applying the electric field of the direct current to the electrode (7, 8); and
D. emitting the pulsating electromagnetic field (3) from the source of the pulsating electromagnetic field (2) into the oil layer (6) through the ground surface, thereby decreasing oil capillary attraction affinity of the reservoir rock, and simultaneously increasing water capillary attraction affinity of the reservoir rock to capillary attract water, together with reducing viscosity of the oil and increasing electro osmotic flow of the oil and layered water;
wherein the source of the pulsating electromagnetic field (2) is at least one coil or dipole antenna.
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