ACIDIC COMPOSITION FOR BOTTOM-HOLE TREATMENT OF OIL RESERVOIR Russian patent published in 2013 - IPC C09K8/74 

FIELD: chemistry.

SUBSTANCE: invention relates to oil industry and can be used for bottom-hole acid treatment, represented by carbonate or terrigenous reservoirs that are non-uniform on permeability. The acidic composition for bottom-hole treatment of an oil reservoir contains, wt %: an acid 5.0-40.0, an emulsifying agent - anionic or nonionic or cationic surfactant or mixture thereof 1.0-10.0, a hydrocarbon solvent 5.0-40.0, a decomposer - primary or secondary alcohol or mixture thereof 0.1-5.0, a corrosion inhibitor 0.01-0.05 and water - the balance. The composition can further contain 0.01-6.0 wt % of a viscosity regulator.

EFFECT: lowing down the rate of reaction the acid with the deposit rock, higher treatment depth, increase in stability of the acidic composition to 120 hours at temperature of up to 60°C, reduced intensity of acid corrosion and removal of asphalt, pitch and paraffin deposits.

2 cl, 2 tbl, 29 ex