PROCEDURE FOR TREATMENT OF BOTTOMHOLE ZONE OF RESERVOIR OF OIL WELL Russian patent published in 2014 - IPC E21B43/27 

FIELD: oil and gas industry.

SUBSTANCE: invention refers to oil industry, namely to methods for treatment of a bottomhole formation zone of an oil well with acid compositions. Method for treatment of a bottomhole formation zone of oil well involves pumping of acid water solution under pressure over 5 MPa into formation with further process conditioning. As acid water solution, 0.5-1% water solution of agent with phosphonic acids is used. The specified solution is pumped in during 7-10 days under pressure up to 8 MPa in volume of up to 2 m³ per 1 m of penetrated net thickness, or in case of pumping in of 2 m³ per 1 m of penetrated net thickness before 7 days, during the remaining time until process conditioning the specified solution is flushed into formation by process fluid under pressure of 5-8 MPa with further process conditioning during 7-10 days. In case if less than 0.5 m³ per 1 m of penetrated net thickness is pumped in during 10 days, process conditioning is carried out by maintaining pressure in a well of 5-8 MPa.

EFFECT: average increase of permeability and productivity for 42% at the same time with simplification and cost reduction of treatment method.

2 cl, 3 ex