OIL FORMATION BOTTOMHOLE ZONE TREATMENT METHOD Russian patent published in 2009 - IPC E21B43/27 C09K8/74 

FIELD: oil and gas industry.

SUBSTANCE: invention refers to oil industry. Oil formation bottomhole zone treatment method includes forcing of acid reagent consisting of the following, wt %: chlorohydric acid 8-76, hydrofluoric acid 1.5-18, surface-active substance 0.3-2.5, corrosion inhibitor 0.1-2.0, and solvent is the rest, through the well to productive formation zone in such amounts that filtration resistances in the formation zone located far from the well are higher than those in the bottomhole zone of the well, and process exposure and removal of waste reaction products from the zone being treated by means of depression impact on the well; at that, when relative well water-intake capacity factor Kwc is not less than 2.5, waste reaction products are removed in the well operating mode, and when Kwc is less than 2.5 - in a forced manner; when well productivity factor Kwp is not less than 0.5 m³/day·atm, forced removal of reaction products from the zone being treated is stopped. The invention has been developed in subclaims.

EFFECT: improving well productivity, and intensifying oil withdrawal from the deposit.

5 cl, 2 tbl, 10 ex