METHOD FOR OPERATIONAL CONTROL OF WATERFLOODING Russian patent published in 2023 - IPC E21B43/00 E21B43/16 E21B43/20 G06F30/20 

FIELD: oil and gas industry.

SUBSTANCE: to implement the method of operational control of waterflooding in a row waterflooding system, a mathematical model of the field is created, in which the intake capacity of injection wells is determined based on the concept of approaching injection to production wells in development blocks with current fluid compensation and reservoir pressure. Injection modes on injection wells are calculated using the injection approximation factor, the value of which depends on the average distance between the producing wells and injection wells affecting them. The calculation of the current compensation is carried out using the CRM mathematical model, based on the principle of enlargement of production and injection wells, where wells of the same nature are combined into one well with generalized technological parameters. As a mathematical model, a combination of the analytical solution of the material balance equation and Darcy's law is used, which reflects the change in the fluid flow rate of the production well when changing the intake capacity of the injection wells affecting it and the fluid production of the surrounding production wells. At the same time, the adaptation of the mathematical model is performed by obtaining the minimum value of the objective function of the discrepancy between the actual and calculated fluid flow rates for each enlarged production well. The values of the control parameters of the model are determined, on the basis of which the distribution of injection between enlarged production wells is calculated. The injection is redistributed based on the values of the current fluid compensation and reservoir pressure measurements in the areas.

EFFECT: increase in the efficiency of injection distribution in injection rows and development blocks.

1 cl, 4 tbl, 8 dwg