OIL DEPOSIT DEVELOPMENT METHOD Russian patent published in 2014 - IPC E21B43/20 

FIELD: oil and gas industry.

SUBSTANCE: invention is related to oil producing industry and namely to development of developed and producing oil fields. The concept of the invention is as follows: the method includes a cyclic mode of injection of a displacing fluid through the system of injectors and extraction of oil through the system of producers. According to the invention annual statistic processing is made for operational data from the section of injectors and producers against two operational parameters - volume of injected water and water cut of the product. Fluctuation coefficient is determined as per an analytical expression considering monthly liquid rate or water cut of the product, an observed average value for statistically processed parameters, standard deviation for statistically processed parameters, and sample scope for the recent four years of the well operation with monthly values of the above parameters. When fluctuation coefficient is less than 10 the cyclic injection mode for the displacing agent is optimized with its injection during winter time. To this end during this period freezing of injector wellheads is prevented, temperature of the displacing agent is increased up to 10-20°C from the initial value at the point of warm water delivery and water shutoff treatment is performed in the producers till water cut of the product reaches 60-70% at most. When fluctuation coefficient is more than 10 the accepted cyclic injection mode for the displacing agent is continued.

EFFECT: invention allows increase in current oil extraction at simultaneous decrease in extracted water used at flooding.

5 dwg, 9 tbl, 1 ex