METHOD TO INCREASE OIL RECOVERY OF FORMATION WITH HIGH VISCOSITY OIL Russian patent published in 2017 - IPC E21B36/04 E21B43/24 E21B28/00 E21B43/25 

FIELD: oil and gas industry.

SUBSTANCE: method for increasing oil recovery of formation with high viscosity oil, in which a tool comprising a spiral line is immersed in a well by means of which alternating azimuthal electric current with frequency of ~10 kHz is excited in well casing pipe, performing local heating of casing section and well reservoir to reduce coefficient of oil viscosity in formation area adjacent to the casing pipe. To increase permeability of the oil reservoir at the same time with heating of the well casing pipe, an acoustic pressure wave is excited to influence the formation, moving the downhole tool in vertical direction up and down in discrete manner at certain space-time intervals which are determined by appropriate mathematical expressions obtained by the authors, and controlling the process for increasing the well production rate.

EFFECT: increase of oil recovery of wells with high viscosity oils without involving methods for external thermal and chemical effects or hydraulic fracturing of formation which are expensive and create significant environmental risks.

2 dwg