METHOD FOR LIMITING WATER INFLUX IN PRODUCING OIL WELLS Russian patent published in 2017 - IPC E21B33/138 C09K8/506 

FIELD: oil and gas industry.

SUBSTANCE: an aqueous solution of the formation collecting properties modifier Componex-21 is prepared in the following ratio, wt %: sodium chloride and/or potassium chloride 0.1-7.0, ammonium salt 1.5-2.8, chelators 0.1-0.8, complexonates or chelates 0.1-2.7, surfactant 0.2-1.0, fresh or mineralized water is the rest. Two-packer or packer assembly is mounted to cut off the watered layer or its part-interlayer or uncultivated part of the formation and from the annular well space. Portion puming of the prepared injection solution is made through tubing into treated zone of formation perforation with holding 10-12 hours between injections. The pressure at the wellhead is measured at the beginning and end of each injection. After reaching the pressure at the wellhead, exceeding initial injection pressure by more than 20 MPa, but not exceeding the value of the hydraulic fracturing pressure, the remaining aqueous solution of the formation collecting properties modifier Componex-21 is finally injected into formation.

EFFECT: invention makes it possible to limit the water inflow from the formation or treated interlayer into the production well and to increase the coverage of the treated formation by flooding.