OIL EXTRACTION METHOD Russian patent published in 2004 - IPC

FIELD: oil extractive industry.

SUBSTANCE: method includes feeding into bed through force well of water solution of chemical reagent - oxyethylated carbon acids having common formula C_nH_2n+1COO(C₂H₄0)_mH, where n=15-20, m=2-11 with molecular mass 344-810, or their mixtures, pushing of it into bed by water and extracting oil through product wells, additionally before feeding of chemical reagent into water solution an organic dissolvent is injected with ratio of oxyethylated carbon acids or their mixtures: organic dissolvent - 1:99 - 99:1, after feeding technological ageing of water solution is included. As organic dissolvents, cellozolves or wastes from cellozolves manufacture can be used, also benzenes or any hydrocarbon dissolvent being a component of benzenes, acetone, butanoles.

EFFECT: higher oil yield when extracting oil deposits with concurrent lowering of water level of extracted product by means of increasing effect area of bed treatment and displacing remaining oil.

2 cl, 1 ex, 3 tbl