METHOD FOR DEVELOPMENT OF HETEROGENEOUS OIL FORMATION (EMBODIMENTS) Russian patent published in 2024 - IPC E21B43/22 E21B43/32 C09K8/588 

FIELD: oil, gas and coke-chemical industry.

SUBSTANCE: invention relates to oil industry and can be used in development of oil deposits. Method includes determination of initial injectivity of injection well at initial injection pressure and sequential injection into formation at injectivity of injection well from 200 to 400 m³/day of water dispersion of filler and active reagent with increase of injection pressure not higher than maximum allowable pressure on production string or productive formations. At that, first, water dispersion of filler is pumped until pumping pressure of 70–100 % of pressure at cluster site. Then active reagent is pumped till water pumping pressure drops by 10–20 % of pumping pressure of water dispersion of filler. Aqueous dispersion of the filler used is a polymer-dispersed composition based on polyacrylamide with a cross-linking agent in the form of chromium acetate with filler concentration in the aqueous dispersion of 0.5–3.0 %. Clay powder and/or chalk are used as filler. Active agent used is 9–12 % hydrochloric acid or 9–15 % clay acid. At injection well intake from 400 to 800 m³/day according to the second version, water dispersion of filler is first injected till injection pressure reaches 60–90 % of pressure at cluster site. Then active reagent is injected till water injection pressure is reduced by 5–10 % of injection pressure of water dispersion of filler. At concentration of filler in water dispersion is 3.0–6.0 %. Active agent used is 6–9 % hydrochloric acid or 9–12 % clay acid.

EFFECT: increased efficiency of action on formation, reduced water content of produced product and increased oil recovery factor.

2 cl, 1 tbl