PROCESS OF OIL RECOVERY INTENSIFICATION AT WELLS WITH WATERFLOODED COLLECTOR Russian patent published in 2008 - IPC E21B43/16 

FIELD: mining.

SUBSTANCE: process of oil recovery intensification at the wells with waterflooded collector enables not only oil recovery increase, but also reduction of average fluid flow watering, is applicable in the strata of different types, including piezoconductively homogenous formations, and can be implemented during well operation without submersible equipment halt and recovered fluid flow interruption. The invention involves repetitive change of water saturation in bottom-hole formation zone, with modulation frequency within the range of 1·10^-6 Hz to 3·10^-4 Hz as modulation parameter for recovered fluid flow, and modulation amplitude providing maximal reduction of average watering; and average recovered fluid flow is determined with the use of oil indicator diagram or is lower than a definite figure by the value not exceeding flow modulation amplitude. This way, the said amplitude is 10 to 20% of the average recovered fluid flow. Oil production is run without recovered fluid flow interruption.

EFFECT: lower average waterflooding of recovered fluid flow by repetitive modulation.

7 cl, 1 ex, 9 dwg