WATER INFLOW TO THE WELLS REDUCTION METHOD Russian patent published in 2019 - IPC E21B43/20 E21B43/32 E21B43/25 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to the oil industry, and can be used in the oil deposits development. Method comprises the production well selection, the low-saline water injection into the injection well for at least five days, this well switching into the waste or reservoir water injection with depletion prior to the event performance. Low-saline water injection into the injection well cycles are repeated with increase in the production well watercut by 10–30 % relative to the watercut after the previous injection cycle. Increasing the low-saline water injection volume in each subsequent cycle. Selecting several production wells located at distances from the injection well of not more than 500 m. Low-saline water injection into the injection well is carried out in the pulsed mode and with operating selected wells. Turning off the fluid into the reservoir pulsed injection device. Switching the injection well into the waste or reservoir water injection. Low-saline water injection into the injection well cycles are repeated with the turned off fluid pulse injection device and with increase in the watercut, at least in one production well, by 10–30 % relative to the watercut after the previous injection cycle. As the fluid pulsed injection device using the spool type hydraulic vibrator. Vibrator contains the hollow shaft and a spool, which are made with slit slots. For the hydraulic vibrator turning off drilling the radial holes in its shaft above the spool. Holes communicate the shaft and well cavity to each other. In the shaft cavity opposite the radial holes and above the slit slots, installing the hollow rod with fixation against the axial movement. Rod is made with the annular protrusion at the inner wall lower end. Rod overlaps the shaft slotted slits during its movement down underneath the radial holes. Hollow rod is moved by the pressure of waste or reservoir water injected into the formation after the ball dropping into the well. Selecting the ball outer diameter to be less than the hollow rod internal diameter and larger than this rod annular protrusion internal diameter.

EFFECT: reduction in watercut and increase in the oil volume production.

1 cl, 5 dwg