TREATMENT METHOD OF BORE-HOLE ZONE Russian patent published in 2013 - IPC E21B43/27 

FIELD: oil and gas industry.

SUBSTANCE: treatment method of a bore-hole zone involves the first stage, at which solution of surface-active substance (SAS) 0.5-1.5% in formation water in the volume of 100-200 m³ is pumped to the well; the second stage, at which there pumped is water solution of hydrochloric acid (10-15%) in the volume based on 0.25-0.5 m³ per running metre of perforated depth of the formation at initial pressure equal to final pressure at the previous stage; the third stage. At which there pumped is water solution of hydrochloric acid (10-15%) with a retarder of the reaction of acid with rock in the volume of 2-5% of volume of the acid solution in the pumping volume of 1-1.5 m³ per running metre of the perforated formation depth at initial pressure equal to final pressure at the previous stage; formation water forcing-through in the volume of 100-200 m³ at initial pressure equal to final pressure of pumping at the previous stage; process exposure during 16-48 hours and bringing the well into operation. Formation water can be pumped in advance to the well till pumping pressure rise at the well head to 1-2 MPa.

EFFECT: improving treatment efficiency of a bore-hole zone.

2 cl, 3 ex