FORMATION METHOD OF STRATA WITH HARD-TO-RECOVER HYDROCARBON RESERVES Russian patent published in 2020 - IPC E21B43/16 E21B43/17 E21B43/32 

FIELD: chemistry.

SUBSTANCE: invention relates to development of hydrocarbon deposits and, in particular, to development of deposits using physics of oil formation, as well as hydromechanics and experimental physics when investigating the nature of movement of liquids through porous media. Method comprises hydraulic fracturing of formation between pairs of wells to form primary trajectories of strata formation channels - SFC. Gamma and neutron logging types are performed to determine parameters of intervals of perforations and lengths of zones. Various types of well tests are carried out. Refined analysis mode is introduced. Number of plugging points is determined as a function of dynamic characteristics of the SFC and depth flows are described taking into account coordinates of the water front of the formation. Additionally, duration of rear fronts of transient processes of hydro-pulsed research subcycles is determined. According to these studies current linear piezoelectric conductivity is predicted in the SFC regions as per the results of well measurements of amplitude pulsations of flow rates of tracing marks and coordinates of the perturbed zone of SFC with reference to amplitude pulsations of measured well pressures. At that, residual oil saturations are predicted additionally in inter-zone areas of SFC starting from skin-zonal endings and nearby endings of localized areas of unproductive areas in direction to zones of inflow of fluids. That is ensured by formation of at least three redirections of fluid flows in carbonate strata and at least five in terrigenous strata in each of these regions.

EFFECT: technical result is higher efficiency of hydrocarbons extraction from productive formations.

3 cl, 3 dwg