METHOD FOR INDIVIDUAL TREATMENT OF PUMPED FLUID FOR CLEANING BOTTOMHOLE FORMATION ZONE OF INJECTION WELL Russian patent published in 2016 - IPC E21B37/06 E21B43/20 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to methods of stimulating formation and its bottom-hole zone to increase capacity. Method comprises determining volume of treated zone of bottom-hole formation zone, radius of treated zone and porosity factor of formation, perforated interval without taking into account impermeable layers on basis of previously performed geophysical and hydrodynamic investigations. Determining first design volume of surface active substance for first pumped liquid. First pumped liquid provides oil ring which washes header with subsequent pumping of second pumped liquid. First design volume is determined according to analytical expression considering first design volume of surfactant, volume of treated zone of bottom-hole formation zone, porosity factor of formation, radius of treated zone and perforated interval without taking into account impermeable inter-layers. First pumped fluid is fed into well. Method includes providing dosed supply of second design volume of surfactant for second fluid pumped into well during preset time. Daily dose volume of second design volume of surfactant does not exceed 1 % of daily water injection volume and specified time ranges from 1 to 5 days.

EFFECT: higher efficiency.

1 cl, 1 dwg