METHOD OF OIL HOLE YIELD INCREASE Russian patent published in 1995 - IPC

FIELD: petroleum industry. SUBSTANCE: method involves increase of oil yield of stratum due to polymeric flooding and inhibition of stratum and also by accompanying plugging washed zones in petroleum stratum at multiple method of oil mining by pumping washing liquid into the hole by portions followed by pressing through into stratum with technical water or oil. The first portion is pumped in composition of washing liquid with water at the ratio 1: 1; the second portion an aqueous solution of washing liquid at concentration 1-2 wt. -% with addition of 0.5-1.0 wt.-% sodium glass; the third portion an aqueous washing liquid at concentration 1-2 wt.-% sodium glass 0.5-1.0 wt.-% with ethylsilicate or carbamide resin, or their mixture at concentration 45-65 wt.-% the fourth portion an aqueous washing liquid at concentration 1-2 wt.-% with sodium glass 0.5-1.0 wt.-% Then after pressing through liquids into stratum mixture is kept for 2-4 hr, and then the fifth portion is pumped an aqueous washing liquid 1-3 wt.-% with sodium glass 3-7 wt. -% at concentration 10-20% of daily volume of pumped liquid into the hole. EFFECT: improved method of oil yield output. 1 tbl