Method for improving crude oil recovery ratio in underground oil reservoir in later period of oil field oil recovery
A technology for underground oil recovery, applied in chemical instruments and methods, production fluids, earth drilling and production, etc., can solve problems affecting ultra-low interfacial tension, chromatographic separation of oil displacement agents, and affecting oil washing efficiency, etc., to achieve Good application prospects, enhanced oil recovery, and good oil washing ability
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Embodiment 1
[0022] The method for increasing the oil recovery rate in the underground oil reservoir in the later stage of oil production in the oil field is carried out as follows:
[0023] a. Inject a water-soluble ultra-high molecular weight polyacrylamide solution with an intrinsic viscosity greater than 3500mL / g into the injection well implementing polymer-activator binary compound flooding as a pre-slug, and inject 0.05 times the formation void volume, the said The concentration of water-soluble ultra-high molecular weight polyacrylamide with an intrinsic viscosity greater than 3500mL / g is 2300mg / L, and the viscosity is greater than 80mPa·s; then
[0024] b. Take water-soluble ultra-high molecular weight polyacrylamide with a concentration of 1500mg / L and a viscosity greater than 50mPa·s and an intrinsic viscosity greater than 3500mL / g: the concentration is 5000mg / L and the interfacial tension is less than 5.0×10 -3 mN / mC 12 -C 18 Alkyl alcohol polyoxyethylene ether sulfonate = 0.1...
Embodiment 2
[0027] The method for increasing the oil recovery rate in the underground oil reservoir in the later stage of oil production in the oil field is carried out as follows:
[0028] a. Inject a water-soluble ultra-high molecular weight polyacrylamide solution with an intrinsic viscosity greater than 3500mL / g into the injection well implementing polymer-activator binary compound flooding as a pre-slug, and inject 0.1 times the formation void volume, the said The concentration of water-soluble ultra-high molecular weight polyacrylamide with an intrinsic viscosity greater than 3500mL / g is 1800mg / L, and the viscosity is greater than 80mPa·s; then
[0029] b. Take water-soluble ultra-high molecular weight polyacrylamide with a concentration of 1800mg / L and a viscosity greater than 50mPa·s and an intrinsic viscosity greater than 3500mL / g: the concentration is 2000mg / L and the interfacial tension is less than 5.0×10 -3 mN / mC 12 -C 18 Alkyl alcohol polyoxyethylene ether sulfonate = 0.18...
Embodiment 3
[0032] The method for increasing the oil recovery rate in the underground oil reservoir in the later stage of oil production in the oil field is carried out as follows:
[0033] a. Injecting a water-soluble ultra-high molecular weight polyacrylamide solution with an intrinsic viscosity greater than 3500mL / g into the injection well implementing polymer-activator binary compound flooding as a pre-slug, injecting 0.07 times the formation void volume, said The concentration of water-soluble ultra-high molecular weight polyacrylamide with an intrinsic viscosity greater than 3500mL / g is 2000mg / L, and the viscosity is greater than 80mPa·s; then
[0034] b. Take water-soluble ultra-high molecular weight polyacrylamide with a concentration of 1700mg / L and a viscosity greater than 50mPa·s and an intrinsic viscosity greater than 3500mL / g: the concentration is 3500mg / L and the interfacial tension is less than 5.0×10 -3 mN / mC 12 -C 18 Alkyl alcohol polyoxyethylene ether sulfonate = 0.16:...
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