DEVICE AND METHOD FOR FOCUSED ELECTRIC HEATING AT OIL-GAS BEARING BEDS OCCURRENCE PLACE

摘要

FIELD: oil and gas industry.;SUBSTANCE: group of inventions relates, in general, to methods and systems for producing hydrocarbons from subterranean formations. System for electric heating in place of oil-and-gas bearing formation includes a tool made with possibility of lowering into downhole casing string. Tool has multiple metal levers designed to extend radially in the casing of the auxiliary well. Each of the metal levers includes an injection electrode, a focusing electrode and the first and second control electrodes. Insulating element is fixed on each metal lever. Insulating element is designed and made with possibility to come into contact with casing and to prevent direct contact of metal lever with casing string. Provided is a switch configured to electrically connect directly to multiple electrodes of one metal lever. Logging cable with multiple wires is connected at one end with a switch and at the second end with instrumentation on the ground surface. Method for extracting hydrocarbons includes lowering tool in well casing to oil-gas reservoir or to place nearby it and creation of equipotential surface for at least length of tool length and extending in direction from axial line of well casing string. Heat beam is created by focusing current of injection and focusing electrodes for heating zone containing hydrocarbons, and subsequent extraction of hydrocarbons from production well.;EFFECT: technical result is higher efficiency of formation heating.;20 cl, 8 dwg