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Oil-resistant and salt-resistant foam flooding system with strong regenerated foam stability

A foam stabilization and foam flooding technology, which is applied in drilling compositions, chemical instruments and methods, etc., can solve the problems of no special emphasis on foam stability, unfavorable oil-containing foam stability, and no attention to foam stability, etc. Good oil and salt resistance, improved effect, and improved fluidity control ability

Active Publication Date: 2021-09-28
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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  • Oil-resistant and salt-resistant foam flooding system with strong regenerated foam stability
  • Oil-resistant and salt-resistant foam flooding system with strong regenerated foam stability
  • Oil-resistant and salt-resistant foam flooding system with strong regenerated foam stability

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) System preparation: Take 0.2g of foaming agent (including 0.15g of lauryl glucoside, 0.05g of lauryl amidopropyl betaine), 0.06g of regeneration enhancer (of which 0.05g of cocamidopropyl amine oxide, Double perfluorooctyl sulfobetaine 0.01g), add 99.74g mineralization degree under low-speed stirring condition and be 22 * ​​10 4 mg / L simulated formation water (ie 22×10 4 mg / L NaCl aqueous solution), the foam system will be obtained after it is completely dissolved.

[0021] (2) Foam oil resistance and salt resistance test:

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

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

[0024] ...

Embodiment 2

[0039] (1) System preparation: Take 0.3g of foaming agent (including 0.2g of decyl maltoside, 0.1g of cocamidopropyl sulfobetaine), 0.14g of growth enhancer (of which 0.1g of cocamidopropyl betaine , double fluorine-containing nonylcarboxylate betaine 0.04g), add 99.56g of salinity under the low-speed stirring condition to be 10×10 4 mg / L simulated formation water (i.e. 10×10 4 mg / L NaCl aqueous solution), the foam system will be obtained after it is completely dissolved.

[0040] (2) Foam oil resistance and salt resistance test:

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

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

[0043]

[00...

Embodiment 3

[0052] (1) System preparation: Take 0.24g of foaming agent (including 0.2g of decyl maltoside, 0.04g of cocamidopropyl sulfobetaine), 0.11g of growth enhancer (of which 0.1g of cocamidopropyl betaine , double fluorine-containing nonylcarboxylate betaine 0.01g), adding 99.65g of mineralization degree under low-speed stirring conditions is 22 × 10 4 mg / L simulated formation water (ie 22×10 4 mg / L NaCl aqueous solution), the foam system will be obtained after it is completely dissolved.

[0053] (2) Foam oil resistance and salt resistance test:

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

[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 regenerated foam stability. The oil-resistant and salt-resistant foam flooding system is prepared from the following parts in percentage by mass: 0.05 to 0.5 percent of foaming agent, 0.05 to 0.2 percent of regeneration enhancer and the balance of formation water or simulated formation water, the regeneration enhancer is prepared by compounding a hydrocarbon zwitterionic surfactant and a fluorocarbon gemini surfactant according to the mass ratio of (10: 1)-(1: 1). The hydrocarbon zwitterionic surface active agent is one of dodecyl dimethyl betaine, cocamidopropyl betaine, sodium lauroamphoacetate and cocamidopropyl dimethylamine oxide. The fluorocarbon gemini surfactant is one of bis (perfluorooctyl) sulfobetaine, bis (perfluorooctyl) quaternary ammonium salt, bis (fluorine-containing nonyl) carboxylic acid betaine and bis (perfluoroalkyl ether) amide betaine. The foam flooding system provided by the invention is oil-resistant and salt-resistant, and can form high-stability foam under the conditions that the degree of mineralization is 22 * 10 < 4 > mg / L and the oil content is 60%.

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 regenerative foam stability. Background technique [0002] After more than half a century of continuous large-scale development of domestic oilfields, high-quality reserves are scarce, and the reserves of heterogeneous and high-salt oil reservoirs widely distributed throughout the country have gradually become the focus of increasing reserves and production, especially for the Central Plains, Northwest, and Changqing How to improve the recovery of oilfields with high-salt oil reserves as the main reserves has become a formidable challenge for us. [0003] Foam flooding with good mobility control ability and wide reservoir adaptability has significant technical advantages in the development of heterogeneous high-salt reservoirs. However, when the reservoir mineralization is too high (>5×...

Claims

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Application Information

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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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