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An oil-resistant and salt-resistant foam flooding system with strong regenerative foam stability

A technology of foam stability and foam flooding, which is applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve problems such as no special emphasis on foam stability, no attention to foam stability, unfavorable stability of oily foam, etc., to achieve Good oil resistance and salt resistance, improve the effect, improve the effect of fluidity control ability

Active Publication Date: 2022-06-17
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The above existing technologies all enhance the oil displacement capability of salt-tolerant foams from the perspective of improving the properties of the oil-water-solid interface, and do not specifically emphasize the stability of the foam after encountering a large amount of crude oil, especially the stability of the regenerated foam after encountering oil rupture.
And in general, the obvious reduction of oil-water interfacial tension means that the foam system is easy to distribute in large quantities at the oil-water interface, which is usually unfavorable for the stability of oil-containing foams.

Method used

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  • An oil-resistant and salt-resistant foam flooding system with strong regenerative foam stability
  • An oil-resistant and salt-resistant foam flooding system with strong regenerative foam stability
  • An oil-resistant and salt-resistant foam flooding system with strong regenerative foam stability

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) system preparation: take foaming agent 0.2g (wherein dodecyl glucoside 0.15g, lauryl amidopropyl betaine 0.05g), regeneration enhancer 0.06g (wherein cocamidopropyl amine oxide 0.05g, Bisperfluorooctyl sulfobetaine 0.01g), add 99.74g under low speed stirring, the salinity is 22×10 4 mg / L of simulated formation water (ie 22×10 4 mg / L NaCl aqueous solution), a foam system is obtained after it is completely dissolved.

[0021] (2) Test of foam oil resistance and salt resistance:

[0022] ①Influence of oil content: Pour 100ml of foam system and crude oil (viscosity of 643mPa·s) into a warning blender together with a certain proportion of its volume, stir for 1min at a shear rate of 6000 rpm, and measure the foam volume The results are shown in Table 1 (oil content=volume of crude oil / volume of foam system). The oil content increases and the foam stability increases.

[0023] Table 1 Effect of oil content on foam properties

[0024] Oil content (%) 0 10 ...

Embodiment 2

[0039] (1) system preparation: take foaming agent 0.3g (wherein decyl maltoside 0.2g, cocamidopropyl isosulbetaine 0.1g), proliferation enhancer 0.14g (wherein cocamidopropyl betaine 0.1g) , double fluorine-containing nonylcarboxylate betaine 0.04g), add 99.56g under low-speed stirring conditions, the salinity is 10 × 10 4 mg / L of simulated formation water (ie 10×10 4 mg / L NaCl aqueous solution), a foam system was obtained after it was completely dissolved.

[0040] (2) Test of foam oil resistance and salt resistance:

[0041] ①Influence of oil content: Pour 100ml of foam system and crude oil (viscosity of 643mPa·s) into a warning blender together with a certain proportion of its volume, stir for 1min at a shear rate of 6000 rpm, and measure the foam volume The results are shown in Table 4 (oil content=volume of crude oil / volume of foam system). The oil content increases and the foam stability increases.

[0042] Table 4 Effect of oil content on foam properties

[0043] ...

Embodiment 3

[0052] (1) system preparation: take foaming agent 0.24g (wherein decyl maltoside 0.2g, cocamidopropyl isosulbetaine 0.04g), proliferation enhancer 0.11g (wherein cocamidopropyl betaine 0.1g) , double fluorine-containing nonyl carboxylic acid betaine 0.01g), add 99.65g under low-speed stirring conditions, the salinity is 22 × 10 4 mg / L of simulated formation water (ie 22×10 4 mg / L NaCl aqueous solution), and a foam system was obtained after it was completely dissolved.

[0053] (2) Test of foam oil resistance and salt resistance:

[0054] ①Influence of oil content: Pour 100ml of foam system and crude oil (viscosity of 643mPa·s) into a warning blender together with a certain proportion of its volume, stir for 1min at a shear rate of 6000 rpm, and measure the foam volume The results are shown in Table 7 (oil content=volume of crude oil / volume of foam system). The oil content increases and the foam stability increases.

[0055] Table 7 Effect of oil content on foam properties ...

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Abstract

The invention discloses an oil-resistant and salt-resistant foam flooding system with strong regenerative foam stability, which is composed of the following components in mass percentage: 0.05-0.5% of foaming agent, 0.05-0.2% of regenerative enhancer, and the rest is formation water or Formation water is simulated; the regeneration enhancer is compounded by a hydrocarbon zwitterionic surfactant and a fluorocarbon gemini surfactant at a mass ratio of 10:1 to 1:1. The hydrocarbon zwitterionic surfactant is one of lauryl dimethyl betaine, cocamidopropyl betaine, sodium lauroamphoacetate and cocamidopropylamine oxide. The fluorocarbon gemini surfactant is one of double perfluorooctyl sulfobetaine, double perfluorooctyl quaternary ammonium salt, double fluorine-containing nonyl carboxylate betaine, and double perfluoroalkyl ether amide betaine. The foam flooding system of the present invention is resistant to oil and salt, and can be used at a salinity of 22×10 4 mg / L, oil content of 60% under the condition of forming high stability foam.

Description

technical field [0001] The invention relates to the technical field of oil and gas field development, in particular to an oil-resistant and salt-resistant foam flooding system with strong regeneration foam stability. Background technique [0002] After more than half a century of continuous large-scale development of domestic oil fields, high-quality reserves are scarce. The reserves of heterogeneous and high-salt oil reservoirs widely distributed across the country are increasingly becoming the focus of increasing reserves and production, especially for the Central Plains, Northwest China and Changqing. How to improve the recovery factor of oilfields with high-salt oil reserves as the main oil field has become a daunting challenge for us. [0003] Foam flooding, which has both good mobility control ability and wide reservoir adaptability, has significant technical advantages in the development of heterogeneous high-salt reservoirs. However, when the reservoir mineralizatio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/584C09K8/594
CPCC09K8/584C09K8/594
Inventor 孙琳吴艳平辛军蒲万芬陈德全
Owner SOUTHWEST PETROLEUM UNIV
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