METHOD AND DEVICE FOR HYDROCARBON RECOVERY STIMULATION Russian patent published in 2005 - IPC

FIELD: oil and gas industry, particularly to stimulate hydrocarbon recovery from well.

SUBSTANCE: method involves arranging at least two electrodes in wells drilled in filtered zones of productive bed; supplying electric current pulses to perform electric well stimulation; creating isolation layer on outer surface of casing pipe installed in at least one well during current pulses supplying, wherein the isolating layer is created by applying low-temperature action to above well, which results in freezing of major productive bed area adjoining outer surface of casing pipe. Device comprises at least two electrodes arranged in wells drilled in filtered zones of productive beds and electric current pulse generation system. The device is also provided with cryoagent source connected with cryoagent injection unit through hydrocarbon supply channel at outlet thereof. The cryoagent source is connected with tube space of at least one well through injector and with cryoagent injection control unit having outlet connected with controlling inlet of with cryoagent injection unit. Inputs of current well stimulation pulse generation system are linked with electrode outputs, controlling input thereof is connected with cryoagent injection control unit input.

EFFECT: increased and localized energy pulse transmission in productive bed due to electrical stimulation pulse parameter forming and electrophysical rock property changing.

7 cl, 1 dwg