OIL PRODUCTION METHOD Russian patent published in 2005 - IPC

FIELD: oil production industry, particularly to increase oil output from water-flooded bed.

SUBSTANCE: method involves injecting chemical reagent in oil bed through injection well; leaving the bed as it is for a certain time; pumping above solution in the bed by water and extracting oil through production wells. The chemical reagent is mixture of organic solvent and hydroxyethylated carbonic acids with the following formula: C_nH_2n+1COO(C₂H₄O)_mH, where n=15-20, m=2-11 and having molecular mass of 344-810. The organic solvent is polyethylene-glycol monomethyl ether with formula O-(CH₂-CH₂-O)_n-H, where n=1-8, or solvent stripper.

EFFECT: increased oil output and reduced water content in produced product due to increased bed coverage and pumping residual oil by solubilization process, possibility to avoid the need of extensive imported polymer usage and, as a result, reduced cost of oil to be produced, possibility of above method usage in the case of very high water content in product to be produced.

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