METHOD OF PROCESSING OIL-FIELD STRATA Russian patent published in 2009 - IPC E21B43/32 

FIELD: oil-and-gas production.

SUBSTANCE: invention relates to the oil industry, particularly to methods of processing strata of oil-fields, and can also be used for waterproofing oil wells and for regulating intake profile of intake wells. The method of processing oil-field strata involves pumping a composition into the strata, containing aqueous solution of an anionic polymer, water soluble inorganic or organic acid or a mixture of acids, aliphatic or aromatic alcohol or a product containing it, and a polyvalent metal salt. The said composition also contains a surface-active substance or a mixture of surface-active substances, fine-grained hydrophobic material FGHM and an inhibitor. Before adding polyvalent metal salt to the aqueous solution of anionic polymer, the said alcohol or product containing it, surface-active substance or mixture of surface-active substances, FGHM and inhibitor are added and pH of the reaction mixture is brought to 0.5-3.0 by adding the said acid or mixture of acids with the following content of components, wt %: water soluble anionic polymer 0.004-5.0, alcohol or product containing it 0.50-50.0, surface-active substance or mixture of surface-active substances 0.50-10.0, FGHM 0.1-3.0, polyvalent metal salt 0.003-0.30, inhibitor 0.1-3.0, water - the rest. The invention is developed in a subclaim.

EFFECT: more efficient processing of strata due to improvement of rheological and hydrophobisation properties of pumped compositions, as well as their oil-sweeping properties.

2 cl, 4 tbl, 4 ex