METHOD FOR OBTAINING ACRYLIC REAGENT TO RESTRICT WATER INFLUX TO OIL RESERVOIR Russian patent published in 2014 - IPC E21B33/138 C09K8/508 

FIELD: oil and gas industry.

SUBSTANCE: invention refers to oil producing industry, and namely to deposit and gel forming reagents based on water-soluble acrylic polymers, which are intended to reduce water permeability of non-homogeneous oil formations and restrict water influx to production wells during development of oil deposits using a waterflooding method. The method for obtaining acrylic reagent lies in hydrolysis of wet wastes of Nitron polyacrilic fibre in the caustic soda solution with addition of technical lignin sulfonates into the reaction mixture within 2-2.5h at a temperature of 95-100°C. At that the ratio of components is the following: wet wastes of Nitron polyacrilic fibre in terms of bone-dry fibre - 7-8 wt %, caustic soda - 6-7.5 wt %, lignin sulfonates on dry basis - 5-6 wt %, water - remaining part.

EFFECT: improving efficiency of water influx in the oil reservoir.

1 dwg, 2 tbl