FIELD: oil industry.
SUBSTANCE: invention relates to oil industry, namely to oil and gas-bearing formation treatment technologies to increase the oil recovery factor. In a method for enhancing the oil recovery factor, including the successive stages of formation treatment: injection of a water-in-oil emulsion with a volume of 3–5 m3/m with a subsequent squeeze with acid composition with a volume of 2–3 m3/m, injection of a highly stable oil-in-water emulsion with a content of silicon dioxide nanoparticles with a volume of 3–7 m3/m with the a subsequent squeeze with liquid from the reservoir pressure maintenance system, where as a water-in-oil emulsion is used a composition with the following composition, % vol.: diesel fuel or treated oil from the point of oil treatment and pumping – 25–35, emulsifier – 1.5–3, technical water is the rest, as the acid composition for carbonate formations a hydrochloride acid composition is used containing, % vol.: hydrochloric acid 30 % – 50–63; acetic acid – 1–3; diethylene glycol – 6–12; corrosion inhibitor – 1.5–2; technical water – the rest, as the acid composition for terrigenous formations a clay-acid composition is used containing, % vol.: hydrochloric acid 30 % – 48–60, hydrofluoric acid – 1–4, diethylene glycol – 6–12, acetic acid – 1–3, corrosion inhibitor – 1.5–2, technical water – the rest, as highly stable oil-in-water emulsion is used a composition with the following composition, % vol.: diesel fuel or treated oil from the point of oil treatment and pumping – 10–20, emulsifier – 1–2.5, colloidal solution of silica dioxide nanoparticles with a particle size of 9 to 100 nanometers – 0.5–1.5, technical water is the rest. Other variant of the method for enhancing the oil recovery factor, including successive stages of formation treatment: injection of inverted emulsion with a volume of 3–5 m3/m with a subsequent squeeze with a non-ionic surfactant, which is used as a composite mixture of Neonol BS-1 with a volume of 2–3 m3/m, injection of a highly stable oil-in-water emulsion with a content of silicon dioxide nanoparticles with a volume of 3–7 m3/m with a subsequent squeeze of liquid from the reservoir pressure maintenance system, where as a water-in-oil emulsion is used a composition with the following composition, % vol.: diesel fuel or treated oil from the point of oil treatment and pumping – 25–35, emulsifier – 1.5–3, technical water – the rest, where as a highly stable oil-in-water emulsion is used a composition with the following composition, % vol.: diesel fuel or treated oil from the point of oil treatment and pumping – 10–20, emulsifier – 1–2.5, colloidal solution of silica dioxide nanoparticles with a particle size of 9 to 100 nanometers – 0.5–1.5, technical water is the rest.
EFFECT: technical result is enhanced oil recovery and an increase in the efficiency of oil and gas field development.
4 cl, 8 dwg, 8 ex
