METHOD FOR DEVELOPING A SHALLOW DEPOSIT AND INDIVIDUAL LENSES OF AN OIL FIELD Russian patent published in 2022 - IPC E21B43/20 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to the oil and gas industry and can be used in the development of small oil deposits, dead-end zones and lenses. The method includes drilling horizontal injection wells and vertical production wells, pumping a working agent through horizontal injection wells, withdrawing products through vertical production wells. Preliminary geophysical methods determine the thickness of the reservoir, the dip angle of the wing of the reservoir, drilling of horizontal injection wells is carried out along the periphery of the deposit parallel to the contour of the water-oil contact with a wellbore length of at least two distances of the design grid of wells, drilling of vertical production wells is carried out in the central part of the deposit, before injection of the working agent, perforation in injection wells in the direction of the reservoir roof along the entire length of the horizontal wellbore, while determining the number of perforation rows according to the formula , where h is the thickness of the productive layer of the reservoir, α is the dip angle of the reservoir wing. Then, the working agent is injected sequentially, alternating the directions of oil displacement, for this, the horizontal injection wells are conditionally divided into four groups according to the cardinal points - north, south, west, east, then the working agent is injected for a month through horizontal injection wells oriented to the north and south, when the horizontal injection wells oriented to the west and east are turned off, and the next month, the working agent is injected through the horizontal injection wells oriented to the west and east, when the horizontal injection wells oriented to the north and south are turned off, while regulating the operating modes of the wells In order to achieve the selection of products with compensation for the injection of a working agent of 100-110%, water with a density higher than the density of formation water by at least 0.04 g/cm³ is injected as a working agent.

EFFECT: method increases the oil recovery of the field by increasing the coverage of the reservoir, the oil recovery factor and reducing the unproductive injection of the working agent in the development of small oil deposits, dead-end zones and lenses.

1 cl, 2 dwg