METHOD FOR COMPLEX INFLUENCE ON NEAR-WELLBORE AREA OF PRODUCTIVE FORMATION Russian patent published in 2021 - IPC E21B43/24 E21B43/26 E21B43/27 C09K8/592 C09K8/62 C09K8/72 

FIELD: petroleum industry.

SUBSTANCE: in the method for complex influence on the near-wellbore area of a productive formation, a well with at least one perforation section located in the area of the productive formation is filled with water or killing fluid, technological composition No. 1 with a density of 1.3 to 1.4 g/cm³ is then supplied via the tubing strings to the bottom of the well, tubing strings are then installed at a height of 20 to 25 m above the upper perforation section followed by technological composition No. 2 with a density of 1.6 to 1.8 g/cm³ being supplied to the well via the tubing strings, the tubing strings are then installed in the perforation area of the well, and technological composition No. 3 constituting an acid solution containing hydrochloric acid at a concentration of 12 to 15% is supplied to the well in the amount of 0.4 to 1.5 m³ per 1 m of the thickness of the productive formation. Technological composition No. 1 contains, wt. % : ammonium nitrate NH₄NO₃ 44.0 to 54.0; sodium hydride NaH 2.8 to 3.2; oxide film-passivated nanoaluminium powder Al 5.6 to 15.6; hydrazine nitrate N₂H₅NO₃ 3.0 to 5.0; oxamide nitrate C₂O₂(NH₂)₂HNO₃ 1.0 to 3.0; dihydrooxymethylcarborane C₄H₁₆B₁₀O₂ (99.9%) 3.0 to 5.0; hydrocarbon fuel 8.0 to 13.0; sodium chloride NaCl and/or potassium chloride KCl 4.5 to 5.5; nitric acid HNO₃ 7.0 to 9.0; emulsifier 0.5 to 3.0; water 10.0 to 15.0; at a ratio of sodium hydride NaH powder to said nanoaluminium powder Al 1:(2 to 5), respectively. Technological composition No. 2 contains, wt. % : sodium nitrite NaNO₂ 18.0 to 23.0; hydrocarbon fuel 8.0 to 13.0; urea CO(NH₂)₂ 22.0 to 28.0; 9-BBN dimer C₁₆H₃₀B₂ 1.0 to 3.0; o-carborane C₂B₁₀H₁₂ (99.9%) 3.0 to 6.0; sodium chloride NaCl and/or potassium chloride KCl 4.5 to 5.5; emulsifier 0.5 to 3.0; water 24.0 to 27.0.

EFFECT: complex influence on the near-wellbore area of a productive formation improving filtration and hydrodynamic characteristics of the near-wellbore area, a significant increase in permeability of the formation and flow rate of the well.

1 cl, 3 dwg, 3 ex