DEVELOPMENT METHOD OF LOW-PERMEABLE RESERVOIR OF OIL DEPOSIT Russian patent published in 2020 - IPC E21B43/16 E21B43/26 

FIELD: oil industry.

SUBSTANCE: invention relates to oil industry and can be used in development of low-permeable reservoir of oil deposit using vertical fractures of hydraulic fracturing of formation – hydrofracturing and multi-stage hydraulic fracturing of reservoir – MGRP in order to maintain reservoir pressure. Method includes selection of deposit, in which average absolute permeability of oil-saturated formation is not more than 2 mD. Then, vertical and horizontal well systems are drilled in this formation. Performing cementing in productive formation of annular space between production string and formation. Secondary drilling is performed. Performing HF and MBR using packers. Products are withdrawn from wells. Reservoir is selected where upstream or downstream oil-saturated formation there is a water-saturated formation, wherein between said oil-saturated and water-saturated formations there is a non-collector interlayer with total thickness of not more than 30 m. After initial oil-filled reservoir in initial wells and initial fracturing in vertical wells, all wells are put into production and operated till average reservoir pressure drops down to (1...1.2)·P_sat , where P_sat is oil saturation pressure gas. Then, repeated MHRP is performed in every second horizontal well and repeated HF in all vertical wells. Height of cracks is made so that to pass through non-collector strata and to involve water-saturated formation in operation. Each well of repeated HF and MHRP is tested. In production of oil inflows, well data are processed for oil. After that, all wells are left for redistribution of formation pressure for a period of up to 2 months. Then, horizontal wells are run in production, in which there was no repeated MFRP. Wells in which the repeated MGRP was used are used for maintaining formation pressure, where possibility of spontaneous pumping of water from the water-saturated formation into the oil-saturated formation due to the pressure difference is provided.

EFFECT: technical result is increasing oil recovery of low-permeable reservoir of oil deposit.

1 cl, 2 dwg, 2 ex