DEVELOPMENT METHOD OF WATER-OIL RESERVOIR Russian patent published in 2020 - IPC E21B43/20 

FIELD: oil, gas and coke-chemical industries.

SUBSTANCE: invention relates to development of oil deposits and can be used for operation of wells at water displacement. Method comprises construction of injection and production wells on any of known networks with secondary opening of interval of productive formation, investigation of geological and physical conditions and structure of productive formation and characteristics of liquids saturating it in borehole products, fluctuations of height of liquid column in well - lifting cycles and reduction of water-oil contact level, controlled pumping of displacement agent into injection wells and controlled withdrawal of product from production wells for maximum efficiency. In the study, absolute marks of the formation roof and group of wells, which are hydrodynamically interconnected, are also determined, in each group of wells in the minimum marks of the formation roof only the injection wells are located, in the maximum - production wells, and the rest wells are installed according to the selected agent pumping system and product extraction. During operation data on volumes of injected agent of each injection well of the group and volumes and water content of each production well of the group are collected, statistical analysis of obtained results is carried out, from which the range of agent pumping modes and sampling volumes for each respective well of the group is determined, which provide maximum efficiency for further operation. In the course of further operation, data are continued to be collected from the corresponding wells, and each time, with reduction of efficiency, new ranges of injection modes of the agent and extraction volumes are determined, which ensure maximum efficiency for further operation.

EFFECT: disclosed method for development of water-oil formation allows cardinal control of sampling and injection processes at long intervals on the basis of analysis of reservoir operation parameters and placement of production and injection wells depending on formation structure of the formation to increase oil production.

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