WATER INFLOW TO THE WELLS REDUCTION METHOD Russian patent published in 2019 - IPC E21B43/20 E21B43/25 E21B28/00 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to the oil industry, and can be used in the oil deposits development. Method for reduction of water influx to wells includes selection of production well, pumping of low-salt water for at least five days into injection well, transfer of this well for pumping of waste water or reservoir with flow rate before event. 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. At that volume of pumping of low-salt water in each next cycle is increased. 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. After that, the device for pulse pumping of liquid into the formation is disconnected, and the injection well is switched to pumping of waste or formation water. Cycles of low-salinity water injection into injection well with gradually increased volume are repeated at disconnected device for pulsed pumping of liquid and at growth of water cut at least in one production well by 10–30 % relative to watering after previous cycle of pumping. As the fluid pulsed injection device using the spool type hydraulic vibrator. It comprises a hollow shaft and a spool, which are made with slotted slots. To disconnect the hydraulic vibrator and communicate the barrel cavity with the well cavity from the outer side wall of the barrel above the spool, a radially arranged thread is made. Cylindrical recess with through radial hole in the center is made from the bottom of this sample. Rubber plate pressed to the bottom of this recess with a threaded bushing wrapped in a threaded sampling is installed into the cylindrical recess of the shaft. Hole of the threaded bushing is made in the form of a hexagon for a key. On the inner side wall of the shaft between the slide valve and the through radial hole there is an annular ledge with a chamfer on the upper face. To prevent fluid flow into hydraulic vibrator and destruction of rubber plate there used is ball discharged into the well. Diameter of the ball is selected less than the diameter of the cavity of the barrel and greater than the inner diameter of the circular projection of the barrel.

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

1 cl, 5 dwg