METHOD FOR OIL PRODUCTION FROM UNDERGROUND OIL DEPOSITS Russian patent published in 2017 - IPC E21B43/24 E21B43/22 

FIELD: oil industry.

SUBSTANCE: invention relates to oil production. Method for oil extraction from underground oil deposits, having at least one injection well and at least one production well, including at least following steps: (1) injecting steam into at least one injection well and extraction of oil by at least one production bore, temperature at injection hole according to process step (1) ranges from 90 to 320 °C, (2) blocking highly permeable zones of oil field in region between at least one injection well and at least one production well by injecting aqueous formulations by at least injection well, formulations water and chemical components contain after injection into reservoir under influence can form gels reservoir temperature, (3) continuing production of oil by at least one production well. Step (2) is performed by separate series pumping into deposit of at least acid composition F1, containing at least water, as well as a water-soluble salt of aluminium (III) and/or partially hydrolysed aluminium (III) salt in amount of 3 to 30 wt% (relative to anhydrous compounds of aluminium) in terms of sum of all components of composition, and composition of F2, containing at least water and at least one water-soluble activator in an amount of 3–60 wt% in terms of sum of all components of composition, which while heating to temperature higher than 50 °C increases pH and is a compound selected from a group comprising urea and water-soluble substituted ureas, under condition that temperature of pumped compositions F1 and F2 before pumping is less than 40 °C. Said compositions when pumping into oil reservoir are mixed with each other and as a result of heating, caused by heat of deposit, form viscous gels.

EFFECT: reduction of water content and increasing oil recovery in beds with very hot zones.

15 cl, 7 dwg, 2 tbl