DEVELOPMENT METHOD OF WATER-FLOODED OIL DEPOSIT Russian patent published in 2019 - IPC E21B43/20 

FIELD: oil, gas and coke-chemical industries.

SUBSTANCE: invention relates to oil and gas industry and, in particular, to methods for development of oil deposit of reservoir type and can be used for extraction of residual product of formation in water-flooded deposit. According to the method, deposits are drilled in a certain grid of vertical production and injection wells in productive formation. Pump the displacing agent into the injection wells and select products from the producing wells. After product watering in one or several production wells at sections of these wells one or several additional production wells are built with inclined boreholes led from upper part of productive formation closer to roof in order to maintain production level. Inclined boreholes are drilled as descending from watered wells with zenith angle of 65–85° towards nearby two injection wells at equal angular distance from them ±7° horizontally. Product extraction from production wells is carried out in modes that make it possible not to exceed water content of product higher than cost-effective. At that, pumping of displacing agent to nearby injection wells is performed in the volume allowing to maintain formation pressure at the same level in the bottomhole zone of horizontal production wells. When the product is watered below the cost-effective one extracted from the inclined wellbore of the production well, the bottomhole of this shaft with the watered section is cut off, after which the product extraction is continued.

EFFECT: technical result is higher efficiency of deposit development.

1 cl, 2 dwg