HYDROCARBON PRODUCTION METHOD WITH PRESSURE MAINTENANCE IN FRACTURED RESERVOIRS Russian patent published in 2014 - IPC E21B43/22 C09K8/584 

FIELD: oil and gas industry.

SUBSTANCE: this invention refers to hydrocarbon production from a fractured reservoir. The method of hydrocarbon production from a fractured reservoir, which matrix is oil-wetted, includes at least one injector and producer, both interconnected to fractures and the matrix, consists of the following stages: a) injection primarily through the injector of a solution of surfactants, which increase viscosity and penetrate to the network of fractures interacting weakly with the matrix and creating a plug in situ in order to reduce significantly and selectively permeability of fractures and to facilitate passage of the solution at the stage b) to the matrix; b) injection secondarily through the injector of a solution of surfactants, which are capable to interact with the matrix thus preferably improving its oil-wetting and oil recovery, at that the above solution flows preferably through the matrix and upon the latent period of at least 24 hours; c) injection thirdly through the injector of water that leads to increase of surface tension, saturation of matrix, oil recovery and, upon solving of the above plug formed at the stage a) by oil, oil displacement to the producer. Invention is developed in dependent claims.

EFFECT: improvement of oil recovery.

17 cl, 3 dwg, 2 ex