METHOD FOR DEVELOPMENT OF CARBONATE OIL RESERVOIR (VERSIONS) Russian patent published in 2017 - IPC E21B43/22 C09K8/582 

FIELD: oil industry.

SUBSTANCE: invention relates to oil industry, in particular to development of carbonate oil formations. Technical result is higher reservoir recovery and reduction of watering of extracted product. Method for development of carbonate oil reservoir, containing sulphate-reducing bacteria – SRB, which involves activation of formation microflora through injection into formation through of an aqueous suspension of nutrients, predetermining injectability of injection well, for injectability of injection well from 100 to 150 m³/day, method includes injecting aqueous solution of said salts with concentration of 1.0 to 1.5 wt% or aqueous solution of sodium or potassium nitrate with concentration from 0.1 to 1.0 wt%, injecting water with said mineral content in an amount of 5–15 m³ and stopping well for suppression of SRB, injecting aqueous solution of said surfactant or complex surfactant with said pour point, containing a mixture of nonionic and cationic surfactant, with concentration of 0.01–0.3 % or aqueous solution of edible diammonium phosphate or trisodium phosphate, or sodium hydroxide with concentration of 0.2–1.5 %, injecting aqueous suspension of nutrients, containing sapropel, starch and edible diammonium phosphate, injecting into formation water with said mineral content in an amount of 10–50 m³, stopping well for process holding for 3 to 15 days, concentration of reagents aqueous suspension is, wt%: starch 0.1–5.0, sapropel 0.5–5.0, edible diammonium phosphate 0.1–2.0, water with mineral content from 0.15 up to 300 g/l – balance. In another version, for injectability of injection well from 150 to 400 m³/day, method includes injecting aqueous solution of sodium or potassium nitrate, or ammonia with concentration of 1.0 to 1.5 wt% or aqueous solution of sodium or potassium nitrite with concentration from 0.1 to 1.0 wt%, injecting into formation water with said mineral content in an amount of 5-15 m³ and stopping well for suppression of SRB, additionally injecting a locking composition, injecting into formation aqueous solution of oxyethylated alkylphenol or complex surfactant with said pour point, containing a mixture of nonionic and cationic surfactant with concentration of 0.01–0.3 % or aqueous solution of edible diammonium phosphate or trisodium phosphate, or sodium hydroxide with concentration of 0.1–1.5 % and stopping well for process holding, injecting aqueous suspension of nutrients, containing sapropel, starch and edible diammonium phosphate, injecting into formation water with said mineral content in an amount of 10–50 m³, stopping well for process holding with said composition of aqueous suspension.

EFFECT: invention is developed in subclaims.

3 cl, 2 ex, 8 tbl