METHOD FOR DEVELOPMENT OF CLAY-COVERED CARBONATE RESERVOIR Russian patent published in 2024 - IPC E21B43/16 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to oil and gas industry and can be used in development of oil deposit of clay-covered carbonate reservoirs. Method for development of clay-covered carbonate reservoir includes drilling of vertical production and injection wells, treatment of water with constant magnetic field, flushing of injection wells with magnetized water, process exposure, pumping of working agent into injection wells and extraction of products from production wells. Drilling is performed in one row of production wells and in two rows of injection wells, excluding location of injection wells opposite to production well. Distance between wells in rows is maintained at 250 m, and distance between rows of production and injection wells – at 350 m. Initial formation pressure Pf, perforated thickness of the formation, actual permeability of the formation and skin factor are determined. Further, reacting production wells are separated into which a composition consisting of 15% aqueous solution of hydrochloric acid, acetic acid, diethylene glycol, corrosion inhibitor “КИ-1” and water is injected at the following ratio of components, wt.%: 15% aqueous solution of hydrochloric acid – 55, acetic acid – 10, diethylene glycol – 15, corrosion inhibitor “КИ-1” – 10, water – the rest, with volume of 0.5–1 m³ per 1 m of perforated formation thickness at barocyclic action with frequency less than 0.5 Hz. At increase of formation permeability of not less than 10% of actual value and reduction of skin factor to value less than 0.07, flushing of each injection well is performed with magnetized water with volume of 35 m³/day and pressure of 1.2 Pf, which does not exceed maximum permissible injection pressure. Duration of washing is 12 days. Then process exposure is performed for 10 days. Further, pumping of working agent into each injection well is carried out with volume of 35 m³/day and pressure of 1.2 Pf, which does not exceed maximum permissible injection pressure.

EFFECT: increased oil recovery factor, prolonged water-free operation of the well.

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