METHOD FOR DYNAMIC BOTTOMHOLE ZONE TREATMENT IN HIGH-TEMPERATURE LOW-PERMEABLE RESERVOIRS Russian patent published in 2008 - IPC E21B43/25 

FIELD: oil and gas production industry, particularly to develop high-temperature low-permeable reservoirs including aleurolitic- argillaceous and sandy-argillaceous ones in Jurassic formations.

SUBSTANCE: method involves serially injection acid solution and buffer liquids in reservoir; stimulating inflow without well holding to provide reaction. The treatment is carried out in two or more reagent supply and removal cycles. At each next cycle treatment radius increased for 40-70 cm. Acid solution and buffer liquid are injected in hydroimpulsive regime with 2.0-10.0 MPa amplitude of hydraulic impacts applied to reservoir. Inflow is stimulated in cyclic depression regime, which provides maximal reservoir productivity after each treatment cycle. Reservoir is treated in single equipment and tool trip.

EFFECT: increased output of oil-producing and injection wells, prevention of secondary sludge and gel formation along with increased intensity of acid reaction with reservoir rock and with increased completeness of spent solution and reaction products removal from treatment zone.

2 cl, 2 dwg