METHOD FOR DEVELOPMENT OF MULTI-LAYER OIL DEPOSIT WITH APPLICATION OF HYDRAULIC FRACTURING OF FORMATION Russian patent published in 2020 - IPC E21B43/26 

FIELD: oil, gas and coke-chemical industries.

SUBSTANCE: invention relates to oil industry and can be used in development of multi-layer oil deposit with application of hydraulic fracturing (HF). Proposed method comprises pumping of displacement agent through injection wells, extraction of formation fluids through production wells, and hydraulic fracturing performance. First, on the multi-face oil deposit, preferential directions of maximum and minimum horizontal stresses are determined, rows of producers and injection wells are staggered in the direction of maximum horizontal stresses, wherein distance between production and injection wells rows is selected not more than 500 meters, distance between production wells in row is selected not more than 500 meters, distance between injection wells in row is selected not less than 1000 meters, production wells are made conditional-vertical - with deviation from vertical not more than 20 meters, and injection wells are made with a double-bar horizontal end with the removal of horizontal shafts in the direction opposite to the central shaft, having lengths equal to the distance between production wells in the row, wherein the horizontal shafts are located in the central part of the multi-layer deposit in the direction parallel to rows of production wells, then in production wells by means of pulsed neutron-neutron logging current saturation of collectors is determined, according to results of which selective perforation is performed in intervals with maximum oil saturation and performing hydraulic fracturing with creation of hydraulic fracturing cracks within productive formation and in direction of maximum horizontal stress, and in injection wells multi-stage HF longitudinal fracturing of hydraulic fractures is created along horizontal maximum stress to ensure hydrodynamic connection with all strata of multi-layer oil deposit.

EFFECT: proposed invention allows to simplify development of multi-layer oil deposit, to increase input rate of multilayer oil deposit into development, and also to increase efficiency of hydraulic fracturing due to controlled development of hydraulic fracture crack along height.

1 cl, 6 dwg