OIL PRODUCTION METHOD Russian patent published in 2013 - IPC E21B43/22 

FIELD: oil and gas industry.

SUBSTANCE: in oil production method involving preliminary performance of a set of hydrodynamic investigations and pumping to the formation of a microgel composition containing polyacrylamide, a cross-linking agent and water, at pumping of microgel composition there additionally added is oxyethylated alkylphenol or complex surface active substance - SAS; at that, microgel composition is obtained by adding to water suspension of polyacrylamide of 5-10% water solution of the cross-linking agent - aluminium salt and at the same time, oxyethylated alkylphenol or complex SAS at the following component ratio, wt %: polyacrylamide 0.03-0.5, cross-linking agent - aluminium salt 0.005-0.15, oxyethylated alkylphenol or complex SAS 0.05-0.3, and water is the rest; at that, prior to pumping of microgel composition, pumping of a gel-forming compound is performed, which is obtained by adding to water suspension of polyacrylamide of 3-10% water solution of the cross-linking agent - chrome salt, at the following component ratio, wt %: polyacrylamide 0.1-0.5, cross-linking agent - chrome salt 0.01-0.05, and water is the rest.

EFFECT: increasing oil extraction efficiency.

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