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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[0021] Example 1:
[0022] The method for improving the recovery factor of crude oil in the underground oil reservoir in the later stage of oil production in the oil field is carried out according to the following steps:
[0023] a. Inject a water-soluble ultra-high molecular weight polyacrylamide solution with an intrinsic viscosity greater than 3500 mL / g into the injection well where the polymer-active agent binary composite flooding is performed as a pre-slug, and inject 0.05 times the formation void volume. The concentration of water-soluble ultra-high molecular weight polyacrylamide with intrinsic viscosity greater than 3500mL / g is 2300mg / L, and the viscosity is greater than 80mPa s; then
[0024] b. Take the 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
Example Embodiment
[0026] Example 2:
[0027] The method for improving the recovery factor of crude oil in the underground oil reservoir in the later stage of oil production in the oil field is carried out according to the following steps:
[0028] a. Inject a water-soluble ultra-high molecular weight polyacrylamide solution with an intrinsic viscosity greater than 3500mL / g into the injection well where the polymer-active agent binary composite flooding is performed as a pre-slug, and inject 0.1 times the formation void volume. The concentration of water-soluble ultra-high molecular weight polyacrylamide with intrinsic viscosity greater than 3500mL / g is 1800mg / L, and the viscosity is greater than 80mPa s; then
[0029] b. Take the water-soluble ultra-high molecular weight polyacrylamide with a concentration of 1800mg / L and a viscosity of more than 50mPa·s and an intrinsic viscosity of more than 3500mL / g: a concentration of 2000mg / L and an interfacial tension of less than 5.0×10 -3 mN /
Example Embodiment
[0031] Example 3:
[0032] The method for improving the recovery factor of crude oil in the underground oil reservoir in the later stage of oil production in the oil field is carried out according to the following steps:
[0033] a. Inject a water-soluble ultra-high molecular weight polyacrylamide solution with an intrinsic viscosity greater than 3500mL / g into the injection well where the polymer-active agent binary composite flooding is performed as a front slug, and inject 0.07 times the formation void volume. The concentration of water-soluble ultra-high molecular weight polyacrylamide with intrinsic viscosity greater than 3500mL / g is 2000mg / L, and the viscosity is greater than 80mPa s; then
[0034] b. Take the 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 -
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