METHOD OF DEVELOPING LOW-PERMEABILITY OIL FIELDS BASED ON THE USE OF HORIZONTAL WELLS WITH LONGITUDINAL FRACTURES OF HYDRAULIC FRACTURING Russian patent published in 2018 - IPC E21B43/267 E21B43/18 E21B43/30 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to oil industry and can be applied to development of purely oil fields with low permeability of the petroleum rock. Method includes drilling of horizontal production wells in a row layout and completion with the use of multi-stage hydraulic fracturing of the MSGRP layer, creation of a system for maintaining reservoir pressure of PPD by flooding method. In parallel to the rows of horizontal production wells, alternating through one row, rows of horizontal injection wells are drilled. Orientation of all horizontal parts of the well bores is carried out in the direction of the maximum horizontal stresses of the formation, which makes it possible in the MSGRP process to obtain longitudinal fracture fractures. Moreover, the MSGRP on all wells is performed using Newtonian fracturing fluid of viscosity less than 35 mPa×from, length of the horizontal part of the wellbore is 1,600 m and more, the number of ports of the MSGRP is 12 units and more, the specific amount of proppant up to 20 tons per port. As a proppant lightweight proppants with a bulk density of less than 1,400 kg/m³ are used, and injection of the displacing agent to maintain formation pressure is carried out at a bottomhole pressure not exceeding the fracture pressure of the formation, which allows to control development of cracks in conditions of easily tearing tire with the purpose of excluding the connection of the main formation with the overlying aquifer.

EFFECT: technical result is to increase oil recovery.

1 cl, 3 dwg