METHOD FOR PRODUCING FORMATIONS WITH HARD TO RECOVER HYDROCARBON RESERVES Russian patent published in 2017 - IPC E21B43/20 E21B43/32 

FIELD: oil and gas industry.

SUBSTANCE: according to the method the length of the won formation areas between the pairs of wellholes and the formation of technological lines of the formation parameter functions and fluids is predetermined byinclinometry data. Hydraulic fracturing of the formation is carried out between the pairs of wellholes forming the direct and crossing output channels. Gamma- and neutron logging are carried out while studying the well perforation zones. Continuous research of fractured areas under nominal and maximum operating pressures when pumping batches of marks is performed. The number of well plugging points in static characteristic function of the generating channels parameters is determined. The research of factures is finished and interfracture areas are plugged in the range of pressures between the pressures of hydraulic fracturing and operation before the second output channel occurs. Redefined research mode is installed. The number of well plugging points in dynamic characteristic function of output channels is specified and the underlying flows considering front coordinates of the formation water cut are described. Preliminary studies are carried out, when the movement of fluids to the front of the water cut in the tenth part of the output channel length can be described by Boussinesq approximation, and after him - by Dupuis-Forchheimer correlation. Similarly, research refinement is carried out when Poiseuille expression is used in the middle of the length of the output channel before the water cut. Research refinement mode is installed using the analytical expression of Dupuis-Forchheimer. Wherein, delivery of the marks and plugging materials express the dependence of Poiseuille to complete formation output. Interfracture areas are plugged due to permanence of output channels cross-section profiles. During high-viscosity fluids, delivery of marks and plugging materials with solvents in the interfracture intervals is confirmed by increased oil content in the output well. Poisson's ratio is used to describe the motion of fluids. Oil extraction starts from the crossing seam output channels.

EFFECT: intensification of production and increasing coefficient of the production extraction from formation due to increasing the fromation coverage by filtration.

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