METHOD FOR DEVELOPING AN OIL DEPOSIT COMPLICATED BY A NETWORK OF VERTICAL FRACTURES Russian patent published in 2023 - IPC E21B43/14 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to methods for enhanced oil recovery from oil deposits with bottom water, complicated by a network of vertical fractures. The method includes construction of production and injection wells in an oil-bearing area, opening a productive formation, pumping water, including formation water, through injection wells and extracting oil through production wells. Use of a packer and installations for simultaneous-separate operation of the reservoir with pumping oil from the oil-bearing part of the reservoir and reservoir water from the aquifer until the formation of an area of reduced reservoir pressure and/or a decrease in the level of water-oil contact (WOC) in production wells. After the construction of the production well, the productivity of the aquifer of the formation, the level of water-oil contact and the thickness of the oil-bearing part and the aquifer of the formation are preliminarily determined. A secondary perforation is performed from the bottom of the formation in the range of 10-15% relative to the thickness of the aquifer of the formation, in the oil-bearing part it is approximately 50% (error 10%) relative to the thickness of the oil-bearing part, and the distance between the perforation intervals is at least 5 m. The packer is set between perforation intervals. The pump for pumping water from the aquifer is used with a productivity that provides the maximum possible pressure reduction in the bottomhole zone of the well under the packer without destroying the integrity of the formation.

EFFECT: simplifying the method of developing an oil deposit complicated by a network of vertical fractures, while increasing the efficiency of oil production without pulling up bottom water due to the simultaneous controlled extraction of water and oil from one vertical well without the use of chemical treatment and special equipment.

1 cl, 1 dwg