METHOD OF INCREASING COEFFICIENT OF EXTRACTION OF OIL ON HARD-TO-RECOVER AND DEPLETED FIELDS Russian patent published in 2018 - IPC E21B43/16 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to mining and oil and gas production industry and can be used in oil wells on hard-to-recover and depleted fields. Method comprises construction of a well in the vicinity of an oil reservoir and exposure to current from a current source. Exposure is carried out using directed electromagnetic radiators. To this end, an alternating current generates an electromagnetic field of different frequency, intensity and periodicity. Electromagnetic radiators are installed along horizontal sections of the well at a distance such that the areas of exposure of adjacent radiation sources do not overlap. Period of electromagnetic action is taken equal to the period of the active action – the maximum runoff. Directed action on the oil-bearing rock around the borehole is sequentially from the nearest to the production column of the electromagnetic radiator to the peripheral one with a delay equal to the regeneration time. Switching-on time of the next electromagnetic radiator is determined by an analytical expression. Switch-on duration of electromagnetic radiators is calculated in such a way that it is sufficient to breakdown the polymolecular layers, taking into account the regeneration time.

EFFECT: higher efficiency of oil production.

1 cl, 2 dwg